CN115896653B - Continuous casting and rolling device and method for high-strength aluminum alloy round rod - Google Patents
Continuous casting and rolling device and method for high-strength aluminum alloy round rod Download PDFInfo
- Publication number
- CN115896653B CN115896653B CN202211647016.2A CN202211647016A CN115896653B CN 115896653 B CN115896653 B CN 115896653B CN 202211647016 A CN202211647016 A CN 202211647016A CN 115896653 B CN115896653 B CN 115896653B
- Authority
- CN
- China
- Prior art keywords
- aluminum alloy
- aluminum
- continuous casting
- liquid
- round rod
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 229910000838 Al alloy Inorganic materials 0.000 title claims abstract description 375
- 238000009749 continuous casting Methods 0.000 title claims abstract description 100
- 238000005096 rolling process Methods 0.000 title claims abstract description 78
- 238000000034 method Methods 0.000 title claims abstract description 33
- 239000007788 liquid Substances 0.000 claims abstract description 198
- 238000007670 refining Methods 0.000 claims abstract description 129
- 238000007872 degassing Methods 0.000 claims abstract description 100
- 229910052782 aluminium Inorganic materials 0.000 claims abstract description 79
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims abstract description 79
- 238000004321 preservation Methods 0.000 claims abstract description 53
- 238000003756 stirring Methods 0.000 claims abstract description 48
- 230000008018 melting Effects 0.000 claims abstract description 36
- 238000002844 melting Methods 0.000 claims abstract description 36
- 238000001914 filtration Methods 0.000 claims abstract description 30
- 238000010791 quenching Methods 0.000 claims abstract description 28
- 230000000171 quenching effect Effects 0.000 claims abstract description 28
- 238000004519 manufacturing process Methods 0.000 claims abstract description 26
- 238000007664 blowing Methods 0.000 claims abstract description 24
- 238000010438 heat treatment Methods 0.000 claims abstract description 23
- 230000006698 induction Effects 0.000 claims abstract description 21
- 238000002788 crimping Methods 0.000 claims abstract description 15
- 239000003795 chemical substances by application Substances 0.000 claims description 83
- 239000012535 impurity Substances 0.000 claims description 80
- 239000007789 gas Substances 0.000 claims description 49
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims description 46
- 239000011777 magnesium Substances 0.000 claims description 34
- 239000002893 slag Substances 0.000 claims description 31
- 229910052786 argon Inorganic materials 0.000 claims description 23
- -1 aluminum manganese Chemical compound 0.000 claims description 19
- 229910052749 magnesium Inorganic materials 0.000 claims description 19
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 17
- 238000001816 cooling Methods 0.000 claims description 17
- 229910002804 graphite Inorganic materials 0.000 claims description 17
- 239000010439 graphite Substances 0.000 claims description 17
- 229910000914 Mn alloy Inorganic materials 0.000 claims description 15
- 239000000460 chlorine Substances 0.000 claims description 15
- ZAMOUSCENKQFHK-UHFFFAOYSA-N Chlorine atom Chemical compound [Cl] ZAMOUSCENKQFHK-UHFFFAOYSA-N 0.000 claims description 14
- 229910000599 Cr alloy Inorganic materials 0.000 claims description 14
- 229910000881 Cu alloy Inorganic materials 0.000 claims description 14
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 claims description 14
- 229910000676 Si alloy Inorganic materials 0.000 claims description 14
- QQHSIRTYSFLSRM-UHFFFAOYSA-N alumanylidynechromium Chemical compound [Al].[Cr] QQHSIRTYSFLSRM-UHFFFAOYSA-N 0.000 claims description 14
- CSDREXVUYHZDNP-UHFFFAOYSA-N alumanylidynesilicon Chemical compound [Al].[Si] CSDREXVUYHZDNP-UHFFFAOYSA-N 0.000 claims description 14
- WPPDFTBPZNZZRP-UHFFFAOYSA-N aluminum copper Chemical compound [Al].[Cu] WPPDFTBPZNZZRP-UHFFFAOYSA-N 0.000 claims description 14
- 229910052801 chlorine Inorganic materials 0.000 claims description 14
- 239000000788 chromium alloy Substances 0.000 claims description 14
- 239000000919 ceramic Substances 0.000 claims description 12
- 239000011651 chromium Substances 0.000 claims description 11
- 238000002425 crystallisation Methods 0.000 claims description 11
- 230000008025 crystallization Effects 0.000 claims description 11
- 239000011572 manganese Substances 0.000 claims description 11
- 239000002245 particle Substances 0.000 claims description 9
- 239000002994 raw material Substances 0.000 claims description 9
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 9
- 239000006260 foam Substances 0.000 claims description 8
- 239000000203 mixture Substances 0.000 claims description 7
- 229910052804 chromium Inorganic materials 0.000 claims description 6
- 239000010949 copper Substances 0.000 claims description 6
- 229910052748 manganese Inorganic materials 0.000 claims description 6
- 239000003595 mist Substances 0.000 claims description 4
- 238000003723 Smelting Methods 0.000 abstract description 6
- 230000000694 effects Effects 0.000 description 24
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 19
- 239000001257 hydrogen Substances 0.000 description 19
- 229910052739 hydrogen Inorganic materials 0.000 description 19
- 230000001965 increasing effect Effects 0.000 description 8
- 229910052710 silicon Inorganic materials 0.000 description 8
- 230000008569 process Effects 0.000 description 7
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 6
- 230000005540 biological transmission Effects 0.000 description 5
- 238000005266 casting Methods 0.000 description 5
- 238000006243 chemical reaction Methods 0.000 description 5
- 238000007667 floating Methods 0.000 description 5
- 239000011159 matrix material Substances 0.000 description 5
- 238000002360 preparation method Methods 0.000 description 5
- 229910052761 rare earth metal Inorganic materials 0.000 description 5
- 238000005728 strengthening Methods 0.000 description 5
- 230000032683 aging Effects 0.000 description 4
- 229910052751 metal Inorganic materials 0.000 description 4
- 239000002184 metal Substances 0.000 description 4
- 238000000746 purification Methods 0.000 description 4
- 238000011160 research Methods 0.000 description 4
- 238000012216 screening Methods 0.000 description 4
- 229910052712 strontium Inorganic materials 0.000 description 4
- 238000009835 boiling Methods 0.000 description 3
- 230000003749 cleanliness Effects 0.000 description 3
- 238000001035 drying Methods 0.000 description 3
- 230000006872 improvement Effects 0.000 description 3
- 229910052742 iron Inorganic materials 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 229910052757 nitrogen Inorganic materials 0.000 description 3
- 239000000047 product Substances 0.000 description 3
- 238000000926 separation method Methods 0.000 description 3
- CIOAGBVUUVVLOB-UHFFFAOYSA-N strontium atom Chemical compound [Sr] CIOAGBVUUVVLOB-UHFFFAOYSA-N 0.000 description 3
- 229910001094 6061 aluminium alloy Inorganic materials 0.000 description 2
- 229910018072 Al 2 O 3 Inorganic materials 0.000 description 2
- 229910002651 NO3 Inorganic materials 0.000 description 2
- NHNBFGGVMKEFGY-UHFFFAOYSA-N Nitrate Chemical compound [O-][N+]([O-])=O NHNBFGGVMKEFGY-UHFFFAOYSA-N 0.000 description 2
- 229910001278 Sr alloy Inorganic materials 0.000 description 2
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 description 2
- RAHZWNYVWXNFOC-UHFFFAOYSA-N Sulphur dioxide Chemical compound O=S=O RAHZWNYVWXNFOC-UHFFFAOYSA-N 0.000 description 2
- 230000009471 action Effects 0.000 description 2
- YNDGDLJDSBUSEI-UHFFFAOYSA-N aluminum strontium Chemical compound [Al].[Sr] YNDGDLJDSBUSEI-UHFFFAOYSA-N 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- PMHQVHHXPFUNSP-UHFFFAOYSA-M copper(1+);methylsulfanylmethane;bromide Chemical compound Br[Cu].CSC PMHQVHHXPFUNSP-UHFFFAOYSA-M 0.000 description 2
- 230000007797 corrosion Effects 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 239000010419 fine particle Substances 0.000 description 2
- 239000003574 free electron Substances 0.000 description 2
- 230000036541 health Effects 0.000 description 2
- VHHHONWQHHHLTI-UHFFFAOYSA-N hexachloroethane Chemical compound ClC(Cl)(Cl)C(Cl)(Cl)Cl VHHHONWQHHHLTI-UHFFFAOYSA-N 0.000 description 2
- 230000002401 inhibitory effect Effects 0.000 description 2
- 229910000765 intermetallic Inorganic materials 0.000 description 2
- 150000002500 ions Chemical class 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000003014 reinforcing effect Effects 0.000 description 2
- 239000000779 smoke Substances 0.000 description 2
- 238000012795 verification Methods 0.000 description 2
- 238000004804 winding Methods 0.000 description 2
- 238000005491 wire drawing Methods 0.000 description 2
- 229910018626 Al(OH) Inorganic materials 0.000 description 1
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 1
- 229910002467 CrFe Inorganic materials 0.000 description 1
- 229910018565 CuAl Inorganic materials 0.000 description 1
- 229910015136 FeMn Inorganic materials 0.000 description 1
- KRHYYFGTRYWZRS-UHFFFAOYSA-N Fluorane Chemical compound F KRHYYFGTRYWZRS-UHFFFAOYSA-N 0.000 description 1
- KRHYYFGTRYWZRS-UHFFFAOYSA-M Fluoride anion Chemical compound [F-] KRHYYFGTRYWZRS-UHFFFAOYSA-M 0.000 description 1
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 description 1
- 229910016583 MnAl Inorganic materials 0.000 description 1
- 229910052783 alkali metal Inorganic materials 0.000 description 1
- 150000001340 alkali metals Chemical class 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 238000005275 alloying Methods 0.000 description 1
- 238000000889 atomisation Methods 0.000 description 1
- 239000006227 byproduct Substances 0.000 description 1
- 229910002091 carbon monoxide Inorganic materials 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 239000000498 cooling water Substances 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 238000004090 dissolution Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 230000005496 eutectics Effects 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 238000011049 filling Methods 0.000 description 1
- 150000004673 fluoride salts Chemical class 0.000 description 1
- 229910000040 hydrogen fluoride Inorganic materials 0.000 description 1
- 239000004615 ingredient Substances 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 229940089027 kcl-40 Drugs 0.000 description 1
- 230000001050 lubricating effect Effects 0.000 description 1
- 230000005012 migration Effects 0.000 description 1
- 238000013508 migration Methods 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 230000006911 nucleation Effects 0.000 description 1
- 238000010899 nucleation Methods 0.000 description 1
- 239000003921 oil Substances 0.000 description 1
- 238000012856 packing Methods 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 150000002910 rare earth metals Chemical class 0.000 description 1
- 238000001953 recrystallisation Methods 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 238000010008 shearing Methods 0.000 description 1
- 229910052708 sodium Inorganic materials 0.000 description 1
- 239000011734 sodium Substances 0.000 description 1
- 159000000000 sodium salts Chemical class 0.000 description 1
- 238000007711 solidification Methods 0.000 description 1
- 230000008023 solidification Effects 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
- 238000009736 wetting Methods 0.000 description 1
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/25—Process efficiency
Landscapes
- Manufacture And Refinement Of Metals (AREA)
- Continuous Casting (AREA)
Abstract
The continuous casting and rolling device comprises a heat accumulating type gas aluminum melting furnace, a tilting type heat preservation furnace with a permanent magnet stirring device, a double-rotor degassing box, a double-filter plate filter box, a wheel belt type continuous casting machine, an intermediate frequency induction heater, a Y-type continuous rolling machine, a quenching device and a crimping device in sequence according to the production process flow. The continuous casting and rolling method sequentially comprises the steps of smelting and preparing aluminum alloy liquid, in-furnace blowing and refining, out-of-furnace online degassing and filtering, continuous casting billet induction heating, aluminum alloy round bar continuous rolling, quenching and crimping. According to the invention, the component uniformity of the aluminum alloy liquid and the stability of the rolling and quenching temperatures of the aluminum alloy round rod are improved, the fluctuation of the strength and the conductivity of the aluminum alloy round rod is reduced, the fluctuation range of the strength is less than 10MPa, the fluctuation range of the conductivity is less than 0.5% IACS, and the high-strength aluminum alloy round rod with uniform performance and stable quality is obtained.
Description
Technical Field
The invention belongs to the technical field of continuous casting and rolling of aluminum alloy, and particularly relates to a continuous casting and rolling device and method for a high-strength aluminum alloy round rod.
Background
Along with the continuous and rapid development of national economy and the continuous improvement of living standard of people, the demand for electric power is continuously increased. The aluminum alloy wire is a carrier for transmitting power, and the conductivity of the aluminum alloy wire directly determines the electric energy loss of the power transmission line. The conductivity of the aluminum alloy wire is improved, the electric energy loss of the transmission line can be reduced, and the transmission efficiency of the line is improved. In addition, the operators in China are wide, the power transmission line needs to span a large number of rivers and lakes, mountain canyons and ice-covered areas, and the strength of the aluminum alloy wires needs to be continuously improved in order to improve the power transmission safety of the power grid.
The Chinese patent application with publication number of CN105296810A discloses a continuous casting and rolling production process of a high-strength aluminum alloy rod, which comprises the following steps: step one: melting aluminum ingots into aluminum liquid in a smelting furnace, and filling the aluminum liquid into a heat preservation furnace for heat preservation; step two: refining ingredients according to the proportion; step three: continuously casting by adopting a casting machine to obtain an ingot blank; the water pressure is automatically controlled by adopting subareas in continuous casting; step four: continuously rolling by induction heating to a temperature of more than or equal to 520 ℃; the rolling system is formed by connecting two rolling mills in series, and comprises a roughing mill and a high rolling mill; step five: quenching; step six: and (5) winding. The invention adopts the zoned automatic control of water pressure in continuous casting, and solves the problems of cracking of ingot blanks and burrs on the wire drawing surface in the prior art.
The Chinese patent application with publication number of CN106938279A discloses a novel combined production method for rolling aluminum and aluminum alloy round bars by using a continuous casting and rolling unit, which comprises two heat preservation furnaces, two degassing boxes, two filter boxes, two continuous casting and rolling units and two sets of wire collecting devices. Each combined production unit shares a set of cooling facilities and control systems, and is operated by a set of stokehold operators and a set of main and auxiliary operators. Each continuous casting and rolling unit is provided with a heat preservation furnace, a degassing box, two filtering chambers and two wire collecting cages. The two aluminum liquid outlets of the heat preservation furnaces of each combined unit are connected, so that the aluminum liquid requirements of two rolling mill sets can be met independently or mutually; two independent heat preservation chambers are arranged in each heat preservation furnace, and the two heat preservation chambers can independently or alternately meet the requirement of one rolling mill group on aluminum liquid. The patent application reduces equipment investment, energy consumption, material consumption and production cost by the combined production method.
The chinese patent application with publication number CN106312003a discloses an aluminum alloy continuous casting and rolling production line, which comprises a melting furnace, a heat preservation furnace, a cooling water tower, an online degassing/filtering box, a continuous casting machine, a traction rolling shear, a straightening cutting machine and an oil way lubricating system, and further comprises a recycling device, so that waste materials generated in the production process are recycled, raw materials are saved greatly, the melting furnace comprises a furnace cover and a furnace body with a heat preservation layer, a cavity-shaped furnace chamber is arranged in the middle of the furnace body, a crucible is arranged in the furnace chamber, a heating wire is arranged outside the crucible, a fixing frame is arranged on the upper portion of the furnace body, a right-angle thermocouple is arranged in the fixing frame, the vertical section of the right-angle thermocouple directly stretches into the crucible, the electric quantity loss is small, the temperature of aluminum liquid can be accurately controlled, the quality of an aluminum alloy rod is ensured, and the rejection rate is reduced.
The Chinese patent application with publication number of CN113369331A discloses a continuous casting and rolling preparation method of 6061 aluminum alloy round bars, which comprises aluminum liquid smelting, aluminum liquid alloying, aluminum liquid electromagnetic stirring, aluminum liquid refining, aluminum liquid converter, aluminum liquid online degassing, aluminum liquid online filtering, aluminum liquid controlled flow, aluminum liquid continuous casting, aluminum billet online straightening, aluminum billet medium frequency induction furnace heating, aluminum billet rough rolling, aluminum billet finish rolling, finished round bar online atomization quenching, finished round bar automatic winding and finished product rolling packing. The invention solves the problems of unstable physical property, lower tensile strength and elongation, poor surface quality of finished products and the like in the existing 6061 aluminum alloy round rod produced by continuous casting and rolling.
The Chinese patent application with publication number of CN111910110A discloses an aluminum-magnesium-silicon aluminum alloy wire and a preparation method thereof, wherein the aluminum-magnesium-silicon aluminum alloy wire comprises the following components in percentage by mass: si:0.25-0.35%, fe: less than or equal to 0.5 percent, cu:0.10-0.20%, mn: less than or equal to 0.005 percent, mg:0.30-0.50%, zn:0.1-0.2%, ti: less than or equal to 0.02 percent, V: less than or equal to 0.001 percent, cr: less than or equal to 0.002 percent, be:0.003-0.01%, and the balance of Al. The preparation method comprises the steps of smelting to obtain aluminum alloy liquid, casting, rolling into an aluminum alloy rod, and carrying out aging treatment and wire drawing treatment on the aluminum alloy rod. The conductivity of the aluminum alloy wire reaches more than 59% IACS, but the tensile strength is lower than 250MPa.
The Chinese patent application with publication number of CN103498084A discloses a novel high-strength high-conductivity aluminum alloy wire and a preparation method thereof, wherein the aluminum alloy wire comprises the following components in percentage by mass: 0.45-0.9% of Mg, 0.2-0.6% of Si, 0.1-1% of Re, 0.01-0.1% of B and the balance of Al. The preparation method preheats raw materials and a die, and performs smelting and casting, extrusion and drawing. The conductivity of the aluminum alloy wire is more than 56% IACS, but the tensile strength is lower than 288 MPa.
The Chinese patent application with publication number of CN108754248A discloses an aluminum alloy wire for overhead stranded wires and a manufacturing method thereof, wherein the aluminum alloy wire comprises the following components in percentage by mass: 1.2-1.4% of Mg, 1.6-1.8% of Si, 0.08-0.12% of La, 0.02-0.03% of Ce, 0.02-0.04% of Cr, 001-0.02% of V, 0.005-0.01% of Ti, 0.0005-0.001% of B, less than or equal to 0.15% of Fe and the balance of Al and unavoidable impurities. The manufacturing method comprises the following steps: smelting to prepare aluminum alloy liquid, in-furnace blowing refining, online grain refining, online degassing and filtering, high-energy ultrasonic stirring, constant-temperature continuous casting and rolling, online quenching, torque-free drawing and artificial aging. The tensile strength of the aluminum alloy wire is more than 330 MPa, but the conductivity is lower than 54.5% IACS.
From the results of production practice and document data retrieval, the high-strength aluminum alloy round bars manufactured by the prior art still have the problems of large fluctuation range of high strength and unstable performance and quality, and particularly have poor strength uniformity and consistency of the aluminum alloy round bars manufactured in the same batch and in different batches, so that the aluminum alloy round bars can be easily broken when the aluminum alloy wire filaments are subsequently drawn, the continuity of production is affected, and the risk of unexpected breakage of the aluminum alloy wires in the use process can be caused. In addition, since the conductivity and the strength of the aluminum alloy are in a mutually restricted relationship, the improvement of the conductivity of the aluminum alloy inevitably involves a sacrifice of the strength, and it is difficult to achieve both the improvement of the conductivity and the strength. In order to improve the conductivity of the aluminum alloy in the prior art, rare earth elements are usually added into the aluminum alloy, but the rare earth elements are expensive, so that the production cost of the high-strength aluminum alloy round rod can be increased. Therefore, the existing continuous casting and rolling device and method for the high-strength aluminum alloy round bar still need to be improved and developed.
Disclosure of Invention
The invention aims to solve the problems and the shortcomings, and provides a continuous casting and rolling device and a continuous casting and rolling method for a high-strength aluminum alloy round rod.
The technical scheme of the invention is realized as follows:
the invention provides a continuous casting and rolling device for a high-strength aluminum alloy round bar, which is characterized by sequentially comprising a heat accumulating type gas aluminum melting furnace, a tilting type heat preservation furnace with a permanent magnet stirring device, a double-rotor degassing box, a double-filter plate filter box, a wheel belt type continuous casting machine, an intermediate frequency induction heater, a Y-type continuous rolling mill, a quenching device and a crimping device according to the production process flow, wherein the heat accumulating type gas aluminum melting furnace is connected with the tilting type heat preservation furnace through a launder, the tilting type heat preservation furnace is connected with the double-rotor degassing box through a launder, the double-rotor degassing box is connected with the double-filter plate filter box through a launder, the permanent magnet stirring device is arranged below the tilting type heat preservation furnace, the double-rotor degassing box is provided with two graphite rotors side by side in the degassing box, the double-filter plate filter box is provided with two foam ceramic filter plates with different meshes in front and back, and the quenching device is a water mist capable of spraying all around inwards.
Preferably, the permanent magnet stirring device is used in a mode of stirring the aluminum alloy liquid in a circulation mode of rotating forward for 1 minute and then rotating backward for 1 minute.
Preferably, the graphite rotor of the double-rotor degassing box has a rotation speed of 400-500 r/min, the gas flow rate on the graphite rotor is 3-4 cubic meters/h, the gas pressure is 0.5-1 MPa, the gas is a mixed gas composed of argon with purity of more than or equal to 99.9% and chlorine with purity of more than or equal to 99.9%, and the volume percentage of the chlorine is 5-10%.
Preferably, the mesh number of the front foam ceramic filter plates of the double-filter plate filter box is 40 meshes, and the mesh number of the rear foam ceramic filter plates is 80 meshes.
The invention provides a continuous casting and rolling method of a high-strength aluminum alloy round rod, which is characterized by comprising the following steps of:
(1) According to the component composition and mass percentage of the high-strength aluminum alloy round rod, aluminum ingots with the purity more than or equal to 99.7 percent, magnesium ingots with the purity more than or equal to 99.9 percent, aluminum silicon alloy, aluminum copper alloy, aluminum manganese alloy and aluminum chromium alloy are selected as raw materials for proportioning;
(2) Heating and melting aluminum ingot at 740-760 ℃ in a heat accumulating type gas aluminum melting furnace to form aluminum liquid;
(3) Transferring the aluminum liquid from the aluminum melting furnace to a tilting type heat preservation furnace with a permanent magnet stirring device through a launder, then adding magnesium ingots, aluminum silicon alloy, aluminum copper alloy, aluminum manganese alloy and aluminum chromium alloy to melt into aluminum alloy liquid, and simultaneously starting the permanent magnet stirring device to stir the aluminum alloy liquid;
(4) After the permanent magnet stirring device is closed, carrying out primary degassing and impurity removal treatment on the aluminum alloy liquid by using argon with the purity of more than or equal to 99.9 percent and a refining agent accounting for 0.1-0.15 percent of the total amount of the aluminum alloy liquid for 15-20 minutes in a blowing refining way, and carrying out slag skimming on the aluminum alloy liquid for 15-20 minutes;
(5) Carrying out secondary degassing and impurity removing treatment on the aluminum alloy liquid by using argon with the purity of more than or equal to 99.9 percent and a refining agent accounting for 0.1-0.15 percent of the total amount of the aluminum alloy liquid for 15-20 minutes in a blowing refining way, and carrying out slag skimming on the aluminum alloy liquid for 20-40 minutes;
(6) Aluminum alloy liquid in the tilting type heat preservation furnace sequentially flows through a double-rotor degassing box and a double-filter plate filter box through a launder to carry out degassing and filtering treatment;
(7) Under the conditions that the temperature of the aluminum alloy liquid is 700-710 ℃ and the line speed of a crystallization wheel of the belt type continuous casting machine is 10-12 m/min, the aluminum alloy liquid flows into the belt type continuous casting machine through a launder to be continuously cast into an aluminum alloy continuous casting blank;
(8) Heating an aluminum alloy continuous casting blank to 490-500 ℃ through an intermediate frequency induction heater;
(9) Feeding the aluminum alloy continuous casting blank into a Y-type continuous rolling mill for continuous rolling into an aluminum alloy round rod with the diameter of 9.5 mm;
(10) And (3) cooling the aluminum alloy round rod to room temperature through a quenching device, and coiling the aluminum alloy round rod through a crimping device to obtain the high-strength aluminum alloy round rod.
Preferably, in the step (3), the permanent magnet stirring device is started to stir the aluminum alloy liquid for 15-25 minutes in a circulation mode of rotating forward for 1 minute and then rotating backward for 1 minute.
The uniformity of the components of the aluminum alloy liquid is the basis and key for ensuring the uniformity and consistency of the strength and the conductivity of the aluminum alloy round bar. In order to improve the uniformity of the components of the aluminum alloy liquid, the stirring of the aluminum alloy liquid in the holding furnace must be enhanced. The aluminum alloy liquid is stirred for 15-25 minutes by adopting a circulation mode that the permanent magnet stirring device rotates forward for 1 minute and then rotates reversely for 1 minute, so that the aluminum alloy liquid in the heat preservation furnace can be fully and uniformly stirred. In addition, after stirring uniformly, the components of the aluminum alloy liquid in the holding furnace should be detected on site, if the components are unqualified, the materials are also required to be supplemented, meanwhile, the permanent magnet stirring device is started again to stir the aluminum alloy, and then the components of the aluminum alloy are detected until the components of the aluminum alloy liquid are qualified.
In the step (4) and the step (5), nitrogen or mixed gas of nitrogen and argon can be adopted to carry out blowing refining on the aluminum alloy liquid, as the nitrogen and the aluminum alloy liquid can react to produce aluminum nitride and remain in aluminum slag, when water is encountered,the reaction of aluminum nitride with water produces ammonia gas, alN+3H, which is strongly irritating to the offensive smell 2 O=Al(OH) 3 ↓+NH 3 And ∈, which causes environmental pollution and harm to human health. Therefore, in the step (4) and the step (5), argon with the purity of more than or equal to 99.9% is preferably selected for carrying out blowing refining on the aluminum alloy liquid.
In the prior art, the aluminum alloy liquid in the holding furnace is subjected to primary blowing refining. The inventor surprisingly found after experimental study that under the condition that the consumption of the refining agent and the refining time are the same, the effect of degassing and impurity removing of the refining agent by two times of jet refining on the aluminum alloy liquid is better than that of one time of jet refining, and the separation of hydrogen and impurities in the aluminum alloy liquid is better facilitated by the two times of jet refining on the refining agent, so that more sufficient floating time is obtained, and although the method can increase some operation time and workload, better degassing and impurity removing effects can be obtained, cleaner aluminum alloy liquid is obtained, and the conductivity of the aluminum alloy round rod is improved.
The temperature of the aluminum alloy liquid in the holding furnace is not too high during refining in the step (4) and the step (5), otherwise, the burning loss of the aluminum alloy liquid is aggravated. The temperature should not be too low, otherwise the degassing and impurity removal effects of the refining agent are reduced. Preferably, the temperature of the aluminum alloy liquid in the holding furnace during refining is 710-730 ℃. The amount of the refining agent is not too low, and the ideal degassing and impurity removing effects cannot be achieved. The larger the consumption of the refining agent is, the better the degassing and impurity removing effects are, but the production cost and the discharge amount of smoke and aluminum slag are increased, and the environment pollution is caused. Because the refining agent has higher degassing and impurity removing efficiency, under the condition of the same adding amount, compared with the existing refining agent, cleaner aluminum alloy liquid can be obtained, and the conductivity of the aluminum alloy round rod is improved.
Preferably, the refining agent in the step (4) and the step (5) comprises the following components in percentage by mass: mgCl 2 30-45%，KCl 25-40%，KBF 4 5-10%，K 2 ZrF 6 5-10%，SrCO 3 6-8%，MnCl 2 3-5%，BaCl 2 2-4%。
The existing refining agent is generally low in degassing and impurity removing efficiency, and the increasing of the consumption of the refining agent can improve the degassing and impurity removing effects, but also can increase the alkali metal content of the aluminum alloy liquid and the discharge amount of aluminum slag, so that secondary pollution is caused to the aluminum alloy liquid, and the conductivity and strength of the aluminum alloy round rod can be reduced. The existing refining agent also commonly contains a large amount of fluoride, nitrate, sulfate, hexachloroethane and other components, and a large amount of irritating and unpleasant smoke, such as hydrogen fluoride, sulfur dioxide and the like, is generated in the refining process, so that the environment is polluted and the human health is endangered. In addition, the existing refining agent has single function and cannot meet the production requirement of high-strength high-conductivity aluminum alloy round bars.
In order to improve the purifying effect of aluminum alloy liquid in the furnace and improve the conductivity and strength of the aluminum alloy round rod, the inventor develops a high-efficiency and environment-friendly multifunctional refining agent through a great amount of experimental researches, and the refining agent contains 30-45% of MgCl 2 25-40% KCl,5-10% KBF 4 5-10% of K 2 ZrF 6 6-8% SrCO 3 3-5% MnCl 2 2-4% BaCl 2 . Wherein, mgCl 2 And KCl is the main component of the refining agent, mgCl 2 And KCl reacts with aluminum alloy liquid to generate AlCl with boiling point of 182.7 DEG C 3 ，AlCl 3 The bubbles adsorb part of hydrogen and impurities in the floating process of the aluminum alloy liquid, so that the effects of degassing, impurity removal and purification are achieved. Partial MgCl 2 And KCl is directly decomposed to release Cl under the thermal action of high-temperature aluminum alloy liquid + Ion, cl + The ions react with hydrogen in the aluminum alloy liquid to generate HCl gas, and HCl bubbles are further adsorbed to remove impurities in the process of overflowing the aluminum alloy liquid, so that the efficient degassing, impurity removing and purifying effects are achieved.
K 2 ZrF 6 And KBF 4 Can react with aluminum alloy liquid to generate KAlF 4 、K 3 AlF 6 Zr and ZrB 2 KAlF obtained by the reaction 4 And K 3 AlF 6 In molten salt state, has large surface tension, is not infiltrated with aluminum alloy liquid, and is suitable for Al 2 O 3 The equal oxide inclusion has good dissolution and wetting effects and can promote Al 2 O 3 Separation of iso-oxide inclusion from aluminium alloy liquidImproving the impurity removing and purifying effects. By-products Zr and ZrB obtained by the reaction 2 The aluminum alloy rod can serve as a heterogeneous nucleation core during solidification of aluminum alloy liquid, plays a role in refining grains, omits special addition of a refiner to refine the grains of the aluminum alloy, and is beneficial to reducing the production cost of the aluminum alloy rod.
The Si phase in the aluminum alloy is usually in a long needle shape in a casting state, so that the strength of the aluminum alloy round rod is not enhanced, but the aluminum matrix is cracked, and the strength and the plasticity of the aluminum alloy round rod are reduced. In the prior art, after refining and degassing and impurity removal in a furnace, metal strontium or an aluminum-strontium alloy is added into an aluminum alloy liquid to refine and modify an acicular Si phase, but adding strontium element easily causes the aluminum alloy liquid to absorb hydrogen again so as to increase the gas content. The inventors have found that, after a lot of experimental studies, srCO is added into a refining agent 3 ，SrCO 3 Decomposition into CO in high temperature aluminum alloy liquid 2 With Sr, CO 2 The bubbles can absorb hydrogen and capture Al in the floating process 2 O 3 And impurities such as the like, and plays roles in degassing, impurity removal and purification. Meanwhile, sr element enters the aluminum alloy liquid to refine and deteriorate Si phase, so that the acicular Si phase is converted into fine particles or fibers, the harm of acicular Si to the strength and plasticity of the aluminum alloy round rod can be eliminated, and the separation of Mg from Si and Mg is facilitated 2 The Si reinforcing phase enhances the strength of the aluminum alloy round bar. Meanwhile, the problem that the air content is increased due to the fact that the aluminum alloy liquid absorbs hydrogen again due to the fact that metal strontium or aluminum-strontium alloy is added after refining in a furnace in the prior art can be avoided.
Fe is an inevitable impurity element in aluminum alloy, and in order to eliminate the harm of Fe, the prior art generally directly adds metal Mn or aluminum-manganese alloy, but the addition amount needs to be larger, and the price of the metal Mn is high, so that the production cost of the aluminum alloy round rod can be increased. In order to improve the degassing and impurity removing effects of the refining agent and eliminate the harm of Fe, the inventor finds that 3 to 5 percent of MnCl is added into the refining agent after a great amount of experimental researches 2 ，MnCl 2 AlCl with boiling point of only 183 ℃ is generated by reaction in aluminum alloy liquid 3 ，AlCl 3 The bubbles can absorb and take away hydrogen and Al in the floating process 2 O 3 Inclusions, etc. are removedAir impurity removal effect. Meanwhile, the replaced Mn enters the aluminum alloy liquid, so that the refining and modification effects on the Fe-rich phase can be realized, the coarse needle-shaped or flake-shaped Fe-rich phase is converted into fine and uniform particles, the harm of Fe can be eliminated, and the strength, the plasticity, the high-temperature performance and the corrosion resistance of the aluminum alloy round rod can be improved.
In order to improve the conductivity of the aluminum alloy round bar, rare earth elements are usually added in the prior art, but the price of the rare earth is higher, so that the production cost of the aluminum alloy round bar can be greatly increased. In order to improve the purifying effect of the refining agent and the conductivity of the aluminum alloy round bar and reduce the production cost, the inventor discovers that 2-4% of BaCl is added into the refining agent after a large amount of experimental researches 2 When BaCl 2 AlCl with the boiling point of only 183 ℃ can be generated by reaction in the aluminum alloy liquid 3 ，AlCl 3 The bubbles adsorb hydrogen and impurities in the floating process, so that the degassing and impurity removal effects are achieved, meanwhile, the replaced Ba element enters into the aluminum alloy liquid, the adsorption effect can be achieved on Fe and Si atoms on the aluminum matrix, the Fe and Si atoms are prevented from being dissolved into the aluminum matrix, the Fe and Si atoms are migrated to the grain boundary, and accordingly the conductivity of the aluminum alloy round rod can be improved.
Preferably, the refining agent in the step (4) and the step (5) is prepared by adopting a remelting method, specifically, the refining agent is heated for 3-4 hours at 80-100 ℃ to be dried and dehydrated, then the refining agent is remelted for 1-2 hours at 900-1100 ℃ in a vacuum furnace with the vacuum degree of 10-20Pa, and the refining agent with the particle size less than or equal to 1 millimeter is obtained after cooling and solidifying to room temperature and then crushing and screening.
The existing refining agent is obtained by directly mixing the dried and dehydrated refining agent to obtain the finished product refining agent, and the method is simple and low in cost, but does not fully exert the interaction among the components of the refining agent, which is also an important reason for low degassing and impurity removal efficiency commonly existing in the existing refining agent. The inventor finds that the components of the refining agent are mutually fused and crystallized through remelting after the refining agent is dried and dehydrated through experimental study, and firstly, the melting point of the refining agent can be obviously reduced, so that the refining agent is easier to melt in aluminum alloy liquid. Secondly, the components of the refining agent are aluminumBetter physical and chemical promotion effect can be generated in the alloy liquid, and better degassing and impurity removal effects can be generated. Such as MgCl 2 Has a melting point of 712 ℃, KCl has a melting point of 770 ℃, and MgCl is formed after high temperature remelting of the refining agent 2 And KCl can form MgCl 2 KCl eutectic, melting point is 490 ℃ only, so the temperature of the refining agent is lower, and the refining agent is easier to melt in the aluminum alloy liquid, and better degassing and impurity removing effects are generated.
The pores and the inclusions can fracture the aluminum matrix of the aluminum alloy round rod, destroy the tissue continuity of the aluminum alloy round rod, weaken the moving speed of free electrons, increase the scattering of the free electrons, and lead the resistivity of the aluminum alloy round rod to rise and the conductivity to drop. The porosity and inclusions are also a crack source and crack propagation method for the fracture of the round rod of aluminum alloy, resulting in a decrease in strength and plasticity. Therefore, in order to improve the conductivity and strength of the aluminum alloy round bar, it is not enough to perform only the blowing refining degassing and impurity removal in the heat preservation furnace, but also the on-line degassing and filtering outside the furnace is needed to perform the deep purification treatment on the aluminum alloy liquid, so as to improve the cleanliness of the aluminum alloy liquid.
In the prior art, only one graphite rotor is usually arranged in the degassing tank, and the time for the aluminum alloy liquid to flow through the degassing tank is short, so that deep degassing of the aluminum alloy liquid cannot be realized. In addition, the prior art filter box is usually provided with only one filter plate, the aperture of the filter plate is usually larger, fine impurities in the micron size cannot be removed, the mesh number of the filter plate is increased, the filter plate is easy to block, and the filtering flow cannot meet the production requirement.
In order to realize deep degassing and impurity removal of aluminum alloy liquid, the inventor firstly develops a double-rotor degassing box, and more tiny bubbles are generated in the aluminum alloy liquid in the degassing box through the high-rotation-speed shearing action of the double rotors, so that the degassing efficiency of the degassing box is improved. The aluminum alloy liquid is firstly filtered through a 40-mesh foam ceramic filter plate, and impurities of more than ten micrometers are adsorbed and filtered out, then the aluminum alloy liquid is filtered through the 80-mesh foam ceramic filter plate, and impurities of several micrometers are further adsorbed and filtered out, so that the aluminum alloy liquid with high cleanliness is obtained, and the conductivity and strength of the aluminum alloy round rod are improved.
Because the strength of the aluminum alloy is very high, in order to obtain high-quality aluminum alloy continuous casting blanks, the temperature of the aluminum alloy liquid before entering the continuous casting machine and the rotation speed of a crystallization wheel of the continuous casting machine must be strictly controlled and matched. The excessive temperature of the aluminum alloy liquid or the too high rotation speed of the crystallization wheel can cause the continuous casting blank to generate hollow or even fracture. The temperature of the aluminum alloy liquid is too low or the rotation speed of the crystallization wheel is too full, so that the production efficiency is reduced, the grains in the continuous casting blank are too thick to be subjected to continuous rolling, and the production efficiency is also severely reduced. Therefore, the temperature of the aluminum alloy liquid in the step (7) is set to be 700-710 ℃, and the line speed of the crystallization wheel of the continuous casting machine is set to be 10-12 m/min.
In the step (8), since the temperature of the aluminum alloy continuous casting billet from the continuous casting machine is usually lower than 480 ℃, if the aluminum alloy continuous casting billet directly enters the continuous rolling mill for rolling, the aluminum alloy round bar is easily broken due to low temperature, and meanwhile, the cooling speed during quenching is also insufficient. In addition, the temperature fluctuation range of the continuously cast aluminum alloy continuous casting blank is larger, if the continuously cast aluminum alloy continuous casting blank directly enters a continuous rolling mill, the temperature fluctuation of the continuously rolled aluminum alloy round rod is larger, and the temperature fluctuation during cooling quenching is large, so that the aluminum alloy round rod is an important reason for uneven strength and electric conductivity and unstable. In order to solve the problem, the aluminum alloy continuous casting blank passes through the intermediate frequency induction heater before entering continuous rolling, the temperature of the aluminum alloy continuous casting blank is stably controlled at 490-500 ℃ by heating of the intermediate frequency induction heater, and then the aluminum alloy continuous casting blank enters the continuous rolling mill for rolling, so that the requirement of continuous rolling on the temperature of the aluminum alloy continuous casting blank is met, the fluctuation of the temperature of the aluminum alloy continuous casting blank and the cooling quenching temperature of the aluminum alloy round rod at the rear can be reduced to the greatest extent, and the uniformity and stability of the strength and conductivity of the aluminum alloy round rod are improved.
In the step (10), the aluminum alloy round rod passes through a quenching device to be cooled to room temperature, namely, the aluminum alloy round rod passes through a through pipe with water mist sprayed inwards at the periphery, and the aluminum alloy round rod is rapidly cooled to room temperature for quenching under the cooling effect of the water mist. In order to increase the cooling rate of the aluminum alloy round bar, the water temperature should not exceed 50 ℃.
The third aspect of the invention provides a high-strength aluminum alloy round rod, which is characterized by comprising the following components in percentage by mass: 0.68-0.78% of Si, 0.65-0.75% of Mg, 0.15-0.25% of Cu, 0.05-0.15% of Mn, 0.05-0.15% of Cr, 0.1-0.2% of Fe, the balance of Al and unavoidable impurities, wherein the single impurity is less than or equal to 0.05%, and the total amount of impurities is less than or equal to 0.15%.
Wherein Si and Mg are main strengthening elements of the aluminum alloy round rod, and Mg can be separated out through aging 2 The Si reinforcing phase enhances the strength of the aluminum alloy round bar. The higher the Si and Mg content, the more Mg 2 The greater the number of Si strengthening phases, the higher the strength of the aluminum alloy round bar, but the conductivity decreases as the Si and Mg content increases. Therefore, the Si and Mg contents must be strictly controlled, neither too low nor too high, which would result in insufficient strength or conductivity. In addition, si forms Mg in addition to Mg 2 In addition to the Si strengthening phase, intermetallic compounds are formed with Fe, consuming part of the Si. Thus, in order to obtain a sufficient amount of Mg 2 The Si strengthening phase also has to be tightly controlled with respect to the Si to Mg ratio. Preferably, the mass ratio of Si to Mg satisfies: si is more than or equal to Mg/1.73+0.3.
The Cu is used for further enhancing the strength of the aluminum alloy round bar. Cu is separated out from CuAl in the aging process of the aluminum alloy round rod 2 The strengthening phase obviously enhances the strength of the aluminum alloy round bar. However, too high a Cu content also reduces the electrical conductivity and corrosion resistance of the aluminum alloy round bar, and therefore the Cu content must also be strictly controlled, neither too low nor too high.
Mn and Cr can form MnAl in aluminum alloy 6 、CrAl 7 Dispersing particles, inhibiting the movement of dislocation in an aluminum matrix and the migration of grain boundaries, improving the recrystallization temperature of the aluminum alloy, inhibiting the growth of recrystallized grains, obtaining aluminum alloy round bars with fine and uniform grains, and improving the strength, the plasticity and the uniformity of the aluminum alloy round bars. A great number of experimental researches show that the effect of adding Mn and Cr in a composite way is better than that of adding one element of Mn or Cr independently. In addition, the Mn and Cr contents should not be too high, otherwise (FeMn) Al is easily formed 6 、(CrFe)Al 7 、(CrMn)Al 12 And coarse intermetallic compounds, the strength and the conductivity of the aluminum alloy round bar are deteriorated. Preferably, the sum of mass percentages of Mn and Cr satisfies: mn+Cr is less than or equal to 0.2 percent.
Fe is an inevitable impurity element in the aluminum alloy, and proper amount of Fe is contained in the aluminum alloy round rod, so that when the Fe-containing phase is in fine particle dispersion distribution on the aluminum alloy round rod, the strength and heat resistance of the aluminum alloy round rod can be enhanced.
Preferably, the aluminum alloy round rod consists of the following components in percentage by mass: si 0.72%, mg 0.69%, cu 0.21%, mn 0.12%, cr 0.06%, fe 0.14%, the balance Al and unavoidable impurities, the single impurity is less than or equal to 0.05%, the total impurity amount is less than or equal to 0.15%.
Compared with the prior art, the invention has the following beneficial effects:
(1) According to the invention, the tilting type heat preservation furnace with the permanent magnet stirring function is adopted to prepare the aluminum alloy liquid, the aluminum alloy liquid in the heat preservation furnace is stirred through the permanent magnet stirring, the component uniformity of the aluminum alloy liquid is improved, and the problems of large fluctuation range of the strength, poor uniformity of performance and poor stability of the existing aluminum alloy round rod are solved through strictly controlling the rolling temperature of an aluminum alloy continuous casting blank and the quenching temperature of the aluminum alloy round rod, so that the fluctuation range of the strength of the aluminum alloy round rod is less than 10MPa and the fluctuation range of the conductivity is less than 0.5% IACS;
(2) According to the invention, the aluminum alloy liquid in the heat preservation furnace is subjected to two-time blowing refining degassing and impurity removal, and then is subjected to degassing and filtering treatment by adopting a double-rotor degassing box and a double-filter plate filtering box outside the heat preservation furnace, so that the cleanliness of the aluminum alloy liquid is greatly improved, the conductivity and the strength of an aluminum alloy round rod are improved, the tensile strength of the aluminum alloy round rod is more than or equal to 340 MPa, and the conductivity is more than or equal to 55% IACS;
(3) The refining agent developed by the invention has higher degassing and impurity removing efficiency, has refining, modifying and modifying functions on the aluminum alloy round rod, has low fluoride salt content, does not contain nitrate, sulfate and hexachloroethane, reduces the emission of irritating and unpleasant gas, is more environment-friendly to use, does not contain sodium salt, and avoids the risk of sodium brittle fracture of the aluminum alloy round rod;
(4) The high-strength aluminum alloy round rod disclosed by the invention is free from adding any rare earth element and any refined modification material, so that the production cost of the high-strength aluminum alloy round rod can be reduced.
Drawings
Fig. 1 is a schematic plan view of a high-strength aluminum alloy round bar continuous casting and rolling device according to the present invention.
Detailed Description
As shown in fig. 1, the continuous casting and rolling device of the high-strength aluminum alloy round bar sequentially comprises a heat accumulating type gas aluminum melting furnace 2, a tilting type heat preservation furnace 3 with a permanent magnet stirring device, a double-rotor degassing box 4, a double-filter plate filter box 5, a wheel belt type continuous casting machine 6, an intermediate frequency induction heater 8, a Y-type continuous rolling machine 9, a quenching device 10 and a crimping device 12 according to the production process, wherein the heat accumulating type gas aluminum melting furnace 2 is connected with the tilting type heat preservation furnace 3 through a launder 1, the tilting type heat preservation furnace 3 is connected with the double-rotor degassing box 4 through the launder 1, the double-rotor degassing box 4 is connected with the double-filter plate filter box 5 through the launder 1, the double-filter plate filter box 5 is connected with the wheel belt type continuous casting machine 6 through the launder 1, the intermediate frequency induction heater 8 is used for heating an aluminum alloy continuous casting blank 7 conveyed by the wheel belt type continuous casting machine 6, the Y-type continuous rolling machine 9 is used for continuously rolling the aluminum alloy blank heated by the intermediate frequency induction heater 8 into the aluminum alloy round bar 11, the aluminum alloy round bar passes through the launder 1 and passes through the crimping device 10 and is provided with the two permanent magnet filtering plates in the two-type ceramic filter plates 4 which are arranged in the same number as the quenching device in the double-filter plate 4, and the two-filter plates are arranged in the two-roll ceramic filter plates 4, and the ceramic filter plate filter plates are arranged in the two-roll device and the two-roll device is arranged in the two-side-type ceramic filter plate filter device and the two-filter plate filter device is arranged in the periphery of a quenching device. Moreover, the heat accumulating type gas aluminum melting furnace, the tilting type heat preserving furnace with the permanent magnet stirring device, the belt type continuous casting machine, the medium frequency induction heater, the Y-type continuous rolling machine and the crimping device all adopt the prior art, so long as the required functions of the invention can be realized, and the specific structure thereof is not described herein, which is easy to understand for the person skilled in the art.
Example 1:
the high-strength aluminum alloy round rod disclosed by the invention comprises the following components in percentage by mass: si 0.72%, mg 0.69%, cu 0.21%, mn 0.12%, cr 0.06%, fe 0.14%, the balance Al and unavoidable impurities, the single impurity is less than or equal to 0.05%, the total impurity amount is less than or equal to 0.15%. The continuous casting and rolling method sequentially comprises the following steps: (1) According to the component composition and mass percentage of the high-strength aluminum alloy round rod, an aluminum ingot with the purity of 99.7 percent, a magnesium ingot with the purity of 99.9 percent, aluminum silicon alloy, aluminum copper alloy, aluminum manganese alloy and aluminum chromium alloy are selected as raw materials for proportioning; (2) Heating and melting aluminum ingots at 750 ℃ in a heat accumulating type gas aluminum melting furnace to form aluminum liquid; (3) Transferring the aluminum liquid from the aluminum melting furnace to a tilting heat preservation furnace through a launder, then adding magnesium ingots, aluminum silicon alloy, aluminum copper alloy, aluminum manganese alloy and aluminum chromium alloy to melt into aluminum alloy liquid, simultaneously starting a permanent magnet stirring device, and stirring the aluminum alloy liquid for 20 minutes by adopting a circulation mode of rotating forward for 1 minute and then rotating backward for 1 minute; (4) After the permanent magnet stirring device is closed, carrying out primary degassing and impurity removal treatment on the aluminum alloy liquid by using argon with the purity of 99.9 percent and a refining agent accounting for 0.1 percent of the total amount of the aluminum alloy liquid in a blowing refining way for 15 minutes, and carrying out slag skimming on the aluminum alloy liquid for 20 minutes; (5) Carrying out secondary degassing and impurity removal treatment on the aluminum alloy liquid by using argon with the purity of 99.9 percent and a refining agent accounting for 0.15 percent of the total amount of the aluminum alloy liquid in a blowing refining way for 20 minutes, and carrying out slag skimming on the aluminum alloy liquid for 30 minutes; (6) The aluminum alloy liquid in the tilting type heat preservation furnace sequentially flows through a double-rotor degassing box and a double-filter plate filter box with the front 40 meshes and the rear 80 meshes through a launder to carry out degassing and filtering treatment, the rotation speed of a graphite rotor of the degassing box is 450 revolutions per minute, the gas flow rate on the graphite rotor is 3.5 cubic meters per hour, the gas pressure is 0.8 MPa, the gas is a mixed gas consisting of argon with the purity of 99.9% and chlorine with the purity of 99.9%, and the volume percentage of the chlorine is 8%; (7) Under the condition that the temperature of the aluminum alloy liquid is 705 ℃ and the line speed of a crystallization wheel rotation line of the belt type continuous casting machine is 11 m/min, the aluminum alloy liquid flows into the belt type continuous casting machine through a launder to be continuously cast into an aluminum alloy continuous casting blank; (8) Heating an aluminum alloy continuous casting blank to 495 ℃ through an intermediate frequency induction heater; (9) Feeding the aluminum alloy continuous casting blank into a Y-type continuous rolling mill for continuous rolling into an aluminum alloy round rod with the diameter of 9.5 mm; (10) And (3) cooling the aluminum alloy round rod to room temperature through a quenching device, and coiling the aluminum alloy round rod through a crimping device to obtain the high-strength aluminum alloy round rod.
The refining agent adopted in the embodiment comprises the following components in percentage by mass: mgCl 2 39.4%，KCl 30.5%，KBF 4 7.9%，K 2 ZrF 6 7.2%，SrCO 3 7.5%，MnCl 2 4.1%，BaCl 2 3.4%. The refining agent is prepared by adopting a remelting method, specifically, the refining agent is heated at 90 ℃ for 3.5 hours, dried and dehydrated, then remelted at 1000 ℃ for 1.5 hours in a vacuum furnace with the vacuum degree of 15 Pa, cooled and solidified to room temperature, and crushed and screened to obtain the refining agent with the particle size less than or equal to 1 millimeter.
Example 2:
the high-strength aluminum alloy round rod disclosed by the invention comprises the following components in percentage by mass: si 0.72%, mg 0.69%, cu 0.21%, mn 0.12%, cr 0.06%, fe 0.14%, the balance Al and unavoidable impurities, the single impurity is less than or equal to 0.05%, the total impurity amount is less than or equal to 0.15%. The continuous casting and rolling method sequentially comprises the following steps: (1) According to the component composition and mass percentage of the high-strength aluminum alloy round rod, an aluminum ingot with the purity of 99.7 percent, a magnesium ingot with the purity of 99.9 percent, aluminum silicon alloy, aluminum copper alloy, aluminum manganese alloy and aluminum chromium alloy are selected as raw materials for proportioning; (2) Heating and melting aluminum ingots at 760 ℃ in a heat accumulating type gas aluminum melting furnace to form aluminum liquid; (3) Transferring the aluminum liquid from the aluminum melting furnace to a tilting heat preservation furnace through a launder, then adding magnesium ingots, aluminum silicon alloy, aluminum copper alloy, aluminum manganese alloy and aluminum chromium alloy to melt into aluminum alloy liquid, simultaneously starting a permanent magnet stirring device, and stirring the aluminum alloy liquid for 25 minutes by adopting a circulation mode of rotating forward for 1 minute and then rotating backward for 1 minute; (4) After the permanent magnet stirring device is closed, carrying out primary degassing and impurity removal treatment on the aluminum alloy liquid by using argon with the purity of 99.9 percent and a refining agent accounting for 0.15 percent of the total amount of the aluminum alloy liquid in a blowing refining way for 20 minutes, and carrying out slag skimming on the aluminum alloy liquid for 15 minutes; (5) Carrying out secondary degassing and impurity removal treatment on the aluminum alloy liquid by using argon with the purity of 99.9 percent and a refining agent accounting for 0.1 percent of the total amount of the aluminum alloy liquid for 15 minutes in a blowing refining way, and carrying out slag skimming on the aluminum alloy liquid for 40 minutes; (6) The aluminum alloy liquid in the tilting type heat preservation furnace sequentially flows through a double-rotor degassing box and a double-filter plate filter box with the front 40 meshes and the rear 80 meshes through a launder to carry out degassing and filtering treatment, the rotation speed of a graphite rotor of the degassing box is 500 revolutions per minute, the gas flow rate on the graphite rotor is 3 cubic meters per hour, the gas pressure is 1 MPa, the gas is mixed gas composed of argon with the purity of 99.9% and chlorine with the purity of 99.9%, and the volume percentage of the chlorine is 5%; (7) Under the condition that the temperature of the aluminum alloy liquid is 710 ℃ and the line speed of a crystallization wheel rotation line of the belt type continuous casting machine is 10 m/min, the aluminum alloy liquid flows into the belt type continuous casting machine through a launder to be continuously cast into an aluminum alloy continuous casting blank; (8) Heating an aluminum alloy continuous casting blank to 500 ℃ through an intermediate frequency induction heater; (9) Feeding the aluminum alloy continuous casting blank into a Y-type continuous rolling mill for continuous rolling into an aluminum alloy round rod with the diameter of 9.5 mm; (10) And (3) cooling the aluminum alloy round rod to room temperature through a quenching device, and coiling the aluminum alloy round rod through a crimping device to obtain the high-strength aluminum alloy round rod.
The refining agent adopted in the embodiment comprises the following components in percentage by mass: mgCl 2 45%，KCl 25%，KBF 4 10%，K 2 ZrF 6 5%，SrCO 3 6%，MnCl 2 5%，BaCl 2 4%. The refining agent is prepared by adopting a remelting method, specifically, the refining agent is heated at 80 ℃ for 4 hours, dried and dehydrated, then remelted at 1100 ℃ for 1 hour in a vacuum furnace with the vacuum degree of 20 Pa, cooled and solidified to room temperature, and crushed and screened to obtain the refining agent with the particle size less than or equal to 1 millimeter.
Example 3:
the high-strength aluminum alloy round rod disclosed by the invention comprises the following components in percentage by mass: si 0.72%, mg 0.69%, cu 0.21%, mn 0.12%, cr 0.06%, fe 0.14%, the balance Al and unavoidable impurities, the single impurity is less than or equal to 0.05%, the total impurity amount is less than or equal to 0.15%. The continuous casting and rolling method sequentially comprises the following steps: (1) According to the component composition and mass percentage of the high-strength aluminum alloy round rod, an aluminum ingot with the purity of 99.7 percent, a magnesium ingot with the purity of 99.9 percent, aluminum silicon alloy, aluminum copper alloy, aluminum manganese alloy and aluminum chromium alloy are selected as raw materials for proportioning; (2) Heating and melting aluminum ingots at 740 ℃ in a heat accumulating type gas aluminum melting furnace to form aluminum liquid; (3) Transferring the aluminum liquid from the aluminum melting furnace to a tilting heat preservation furnace through a launder, then adding magnesium ingots, aluminum silicon alloy, aluminum copper alloy, aluminum manganese alloy and aluminum chromium alloy to melt into aluminum alloy liquid, simultaneously starting a permanent magnet stirring device, and stirring the aluminum alloy liquid for 15 minutes by adopting a circulation mode of rotating forward for 1 minute and then rotating backward for 1 minute; (4) After the permanent magnet stirring device is closed, carrying out primary degassing and impurity removal treatment on the aluminum alloy liquid by using argon with the purity of 99.9 percent and a refining agent accounting for 0.12 percent of the total amount of the aluminum alloy liquid in a blowing refining way for 17 minutes, and carrying out slag skimming on the aluminum alloy liquid for 16 minutes; (5) Carrying out secondary degassing and impurity removal treatment on the aluminum alloy liquid by using argon with the purity of 99.9 percent and a refining agent accounting for 0.13 percent of the total amount of the aluminum alloy liquid in a blowing refining way for 18 minutes, and carrying out slag skimming on the aluminum alloy liquid for 25 minutes; (6) The aluminum alloy liquid in the tilting type heat preservation furnace sequentially flows through a double-rotor degassing box and a double-filter plate filter box with the front 40 meshes and the rear 80 meshes through a launder to carry out degassing and filtering treatment, the rotation speed of a graphite rotor of the degassing box is 400 revolutions per minute, the gas flow rate on the graphite rotor is 3.6 cubic meters per hour, the gas pressure is 0.7 MPa, the gas is a mixed gas consisting of argon with the purity of 99.9% and chlorine with the purity of 99.9%, and the volume percentage of the chlorine is 8%; (7) Under the condition that the temperature of the aluminum alloy liquid is 700 ℃ and the line speed of a crystallization wheel rotation line of the belt type continuous casting machine is 12 meters/min, the aluminum alloy liquid flows into the belt type continuous casting machine through a launder to be continuously cast into an aluminum alloy continuous casting blank; (8) Heating an aluminum alloy continuous casting blank to 490 ℃ through an intermediate frequency induction heater; (9) Feeding the aluminum alloy continuous casting blank into a Y-type continuous rolling mill for continuous rolling into an aluminum alloy round rod with the diameter of 9.5 mm; (10) And (3) cooling the aluminum alloy round rod to room temperature through a quenching device, and coiling the aluminum alloy round rod through a crimping device to obtain the high-strength aluminum alloy round rod.
The refining agent adopted in the embodiment comprises the following components in percentage by mass: mgCl 2 30.5%，KCl 40%，KBF 4 5.5%，K 2 ZrF 6 10%，SrCO 3 8%，MnCl 2 3.5%，BaCl 2 2.5%. In addition, the refining agent is prepared by adopting a remelting method, in particular to a method for preparing the refining agent in the following steps ofHeating at 95 ℃ for 3.2 hours, drying and dehydrating, remelting the refining agent in a vacuum furnace with the vacuum degree of 10 Pa at 900 ℃ for 2 hours, cooling and solidifying to room temperature, and crushing and screening to obtain the refining agent with the particle size less than or equal to 1 mm.
Example 4:
the high-strength aluminum alloy round rod disclosed by the invention comprises the following components in percentage by mass: si 0.72%, mg 0.69%, cu 0.21%, mn 0.12%, cr 0.06%, fe 0.14%, the balance Al and unavoidable impurities, the single impurity is less than or equal to 0.05%, the total impurity amount is less than or equal to 0.15%. The continuous casting and rolling method sequentially comprises the following steps: (1) According to the component composition and mass percentage of the high-strength aluminum alloy round rod, an aluminum ingot with the purity of 99.7 percent, a magnesium ingot with the purity of 99.9 percent, aluminum silicon alloy, aluminum copper alloy, aluminum manganese alloy and aluminum chromium alloy are selected as raw materials for proportioning; (2) Heating and melting an aluminum ingot in a heat accumulating type gas aluminum melting furnace at 755 ℃ to form aluminum liquid; (3) Transferring the aluminum liquid from the aluminum melting furnace to a tilting heat preservation furnace through a launder, then adding magnesium ingots, aluminum silicon alloy, aluminum copper alloy, aluminum manganese alloy and aluminum chromium alloy to melt into aluminum alloy liquid, simultaneously starting a permanent magnet stirring device, and stirring the aluminum alloy liquid for 22 minutes by adopting a circulation mode of rotating forward for 1 minute and then rotating backward for 1 minute; (4) After the permanent magnet stirring device is closed, carrying out primary degassing and impurity removal treatment on the aluminum alloy liquid by using argon with the purity of 99.9 percent and a refining agent accounting for 0.1 percent of the total amount of the aluminum alloy liquid in a blowing refining way for 15 minutes, and carrying out slag skimming on the aluminum alloy liquid for 16 minutes; (5) Carrying out secondary degassing and impurity removal treatment on the aluminum alloy liquid by using argon with the purity of 99.9 percent and a refining agent accounting for 0.1 percent of the total amount of the aluminum alloy liquid in a blowing refining way for 17 minutes, and carrying out slag skimming on the aluminum alloy liquid for 35 minutes; (6) The aluminum alloy liquid in the tilting type heat preservation furnace sequentially flows through a double-rotor degassing box and a double-filter plate filter box with the front 40 meshes and the rear 80 meshes through a launder to carry out degassing and filtering treatment, the rotation speed of a graphite rotor of the degassing box is 480 r/min, the gas flow rate on the graphite rotor is 3.2 cubic meters/h, the gas pressure is 0.6 MPa, the gas is a mixed gas consisting of argon with the purity of 99.9% and chlorine with the purity of 99.9%, and the volume percentage of the chlorine is 6%; (7) Under the condition that the temperature of the aluminum alloy liquid is 708 ℃ and the line speed of a crystallization wheel of the belt type continuous casting machine is 11 m/min, the aluminum alloy liquid flows into the belt type continuous casting machine through a launder to be continuously cast into an aluminum alloy continuous casting blank; (8) Heating an aluminum alloy continuous casting blank to 498 ℃ through an intermediate frequency induction heater; (9) Feeding the aluminum alloy continuous casting blank into a Y-type continuous rolling mill for continuous rolling into an aluminum alloy round rod with the diameter of 9.5 mm; (10) And (3) cooling the aluminum alloy round rod to room temperature through a quenching device, and coiling the aluminum alloy round rod through a crimping device to obtain the high-strength aluminum alloy round rod.
The refining agent adopted in the embodiment comprises the following components in percentage by mass: mgCl 2 35.2%，KCl 35.8%，KBF 4 5.3%，K 2 ZrF 6 8.9%，SrCO 3 7.1%，MnCl 2 4.4%，BaCl 2 3.3 percent, remelting refining agent to obtain: heating the refining agent at 100 ℃ for 3 hours, drying and dehydrating, remelting the refining agent at 950 ℃ for 1.6 hours in a vacuum furnace with the vacuum degree of 18 Pa, cooling and solidifying to room temperature, and crushing and screening to obtain the refining agent with the particle size less than or equal to 1 mm.
Example 5:
the high-strength aluminum alloy round rod disclosed by the invention comprises the following components in percentage by mass: si 0.72%, mg 0.69%, cu 0.21%, mn 0.12%, cr 0.06%, fe 0.14%, the balance Al and unavoidable impurities, the single impurity is less than or equal to 0.05%, the total impurity amount is less than or equal to 0.15%. The continuous casting and rolling method sequentially comprises the following steps: (1) According to the component composition and mass percentage of the high-strength aluminum alloy round rod, an aluminum ingot with the purity of 99.7 percent, a magnesium ingot with the purity of 99.9 percent, aluminum silicon alloy, aluminum copper alloy, aluminum manganese alloy and aluminum chromium alloy are selected as raw materials for proportioning; (2) Heating and melting an aluminum ingot at 745 ℃ in a heat accumulating type gas aluminum melting furnace to form aluminum liquid; (3) Transferring the aluminum liquid from the aluminum melting furnace to a tilting heat preservation furnace through a launder, then adding magnesium ingots, aluminum silicon alloy, aluminum copper alloy, aluminum manganese alloy and aluminum chromium alloy to melt into aluminum alloy liquid, simultaneously starting a permanent magnet stirring device, and stirring the aluminum alloy liquid for 17 minutes by adopting a circulation mode of rotating forward for 1 minute and then rotating backward for 1 minute; (4) After the permanent magnet stirring device is closed, carrying out primary degassing and impurity removal treatment on the aluminum alloy liquid by using argon with the purity of 99.9 percent and a refining agent accounting for 0.15 percent of the total amount of the aluminum alloy liquid in a blowing refining way for 19 minutes, and carrying out slag skimming on the aluminum alloy liquid for 16 minutes; (5) Carrying out secondary degassing and impurity removal treatment on the aluminum alloy liquid by using argon with the purity of 99.9 percent and a refining agent accounting for 0.15 percent of the total amount of the aluminum alloy liquid in a blowing refining way for 20 minutes, and carrying out slag skimming on the aluminum alloy liquid for 30 minutes; (6) The aluminum alloy liquid in the tilting type heat preservation furnace sequentially flows through a double-rotor degassing box and a double-filter plate filter box with the front 40 meshes and the rear 80 meshes through a launder to carry out degassing and filtering treatment, the rotation speed of a graphite rotor of the degassing box is 430 revolutions per minute, the gas flow rate on the graphite rotor is 3.5 cubic meters per hour, the gas pressure is 0.9 MPa, the gas is a mixed gas consisting of argon with the purity of 99.9% and chlorine with the purity of 99.9%, and the volume percentage of the chlorine is 7%; (7) Under the condition that the temperature of the aluminum alloy liquid is 704 ℃ and the line speed of a crystallization wheel rotation line of the belt type continuous casting machine is 10 m/min, the aluminum alloy liquid flows into the belt type continuous casting machine through a launder to be continuously cast into an aluminum alloy continuous casting blank; (8) Heating an aluminum alloy continuous casting blank to 492 ℃ through an intermediate frequency induction heater; (9) Feeding the aluminum alloy continuous casting blank into a Y-type continuous rolling mill for continuous rolling into an aluminum alloy round rod with the diameter of 9.5 mm; (10) And (3) cooling the aluminum alloy round rod to room temperature through a quenching device, and coiling the aluminum alloy round rod through a crimping device to obtain the high-strength aluminum alloy round rod.
The refining agent adopted in the embodiment comprises the following components in percentage by mass: mgCl 2 44.8%，KCl 25.2%，KBF 4 5.3%，K 2 ZrF 6 5.1%，SrCO 3 6.7%，MnCl 2 3.9%，BaCl 2 2.0 percent, and the refining agent is obtained by remelting: heating the refining agent at 85 ℃ for 3.8 hours, drying and dehydrating, remelting the refining agent at 900 ℃ for 2 hours in a vacuum furnace with the vacuum degree of 20 Pa, cooling and solidifying to room temperature, and crushing and screening to obtain the refining agent with the particle size less than or equal to 1 mm.
Verification example 1:
the hydrogen content and the slag content of the aluminum alloy liquid in the holding furnace before refining, the hydrogen content and the slag content of the aluminum alloy liquid in the holding furnace after refining, and the hydrogen content and the slag content of the aluminum alloy liquid after on-line degassing and filtering outside the furnace in examples 1 to 5 were measured on site by using an HDA-V hydrogen meter and an Analyze PoDFA slag meter, and the results are shown in Table 1. As can be seen from Table 1, refiningThe hydrogen content of the aluminum alloy liquid in the front heat preservation furnace is higher than 0.42 ml/100gAl, and the slag content is higher than 0.33 mm 2 /kg. The hydrogen content of the aluminum alloy liquid in the heat preservation furnace after refining is lower than 0.19 ml/100gAl, and the slag content is lower than 0.17 mm 2 And/kg, the degassing efficiency reaches more than 56%, and the impurity removal efficiency reaches more than 51%. The traditional aluminum alloy liquid in the heat preservation furnace is subjected to primary blowing refining or the traditional refining agent is adopted to conduct blowing refining, the degassing efficiency is generally lower than 50%, and the impurity removal efficiency is lower than 45%. Compared with the prior art, the refining agent is adopted to carry out the blowing refining on the aluminum alloy liquid in the heat preservation furnace for two times, so that the aluminum alloy liquid in the heat preservation furnace has better degassing and impurity removing effects, and the gas slag content of the aluminum alloy liquid in the heat preservation furnace can be lower.
As can be seen from Table 1, after the aluminum alloy liquid is subjected to on-line degassing and filtering by adopting the double-rotor degassing tank and the double-filter plate filtering tank, the hydrogen content of the aluminum alloy liquid is lower than 0.1 ml/100gAl, and the slag content is lower than 0.08 mm 2 /kg. After the conventional single-rotor degassing tank and the single-stage filter plate filtering tank are adopted to carry out online degassing and filtering on the aluminum alloy liquid, the hydrogen content of the aluminum alloy liquid is generally higher than 0.13 ml/100gAl, and the slag content is higher than 0.1 mm 2 According to comparison, the aluminum alloy liquid is subjected to online degassing and filtering treatment by using the double-rotor degassing tank and the double-stage filtering plate filtering tank, so that the aluminum alloy liquid has a higher degassing and impurity removing effect, and the gas slag content of the aluminum alloy liquid can be obviously reduced.
TABLE 1 gas content and slag content of aluminum alloy liquid
| Example 1 | Example 2 | Example 3 | Example 4 | Example 5 | |
| Hydrogen content/(ml/100 gAl) of aluminum alloy liquid in heat preservation furnace before refining | 0.431 | 0.429 | 0.426 | 0.435 | 0.421 |
| Hydrogen content/(ml/100 gAl) of aluminum alloy liquid in refining heat preservation furnace | 0.186 | 0.185 | 0.183 | 0.188 | 0.179 |
| On-line degassing and filtering aluminium alloy liquid hydrogen content/(ml/100 gAl) | 0.093 | 0.091 | 0.085 | 0.098 | 0.079 |
| Slag content/(mm) of aluminum alloy liquid in heat preservation furnace before refining 2 /kg) | 0.345 | 0.341 | 0.338 | 0.346 | 0.332 |
| Slag content/(mm) of aluminum alloy liquid in refining heat preservation furnace 2 /kg) | 0.167 | 0.166 | 0.164 | 0.168 | 0.161 |
| Slag content/(mm) of aluminum alloy liquid after on-line degassing and filtering 2 /kg) | 0.077 | 0.073 | 0.075 | 0.079 | 0.068 |
Verification example 2:
The high strength aluminum alloy round bars of examples 1 to 5 were aged at 180℃for 6 hours, and then the tensile mechanical properties and the electrical conductivity of the aluminum alloy round bars were examined, respectively, and the results are shown in Table 2. As can be seen from Table 2, the tensile strength of the round aluminum alloy rods of examples 1-5 is not less than 340 MPa, the yield strength is not less than 305 MPa, the elongation after breaking is not less than 8%, and the electrical conductivity is not less than 55% IACS. The tensile strength of the aluminum-magnesium-silicon aluminum alloy round rod manufactured in the prior art is usually lower than 330 MPa, the yield strength is lower than 290 MPa, the elongation after fracture is lower than 8%, and the conductivity is lower than 54% IACS. Compared with the prior art, the aluminum alloy round rod has the advantages that the strength and the conductivity of the aluminum alloy round rod can be obviously improved by carrying out deep degassing, impurity removal and purification treatment on the aluminum alloy liquid. It can also be seen from Table 2 that the strength fluctuation range of the aluminum alloy round bars of examples 1-5 is less than 10 MPa, the conductivity fluctuation range is less than 0.5% IACS, whereas the strength fluctuation range of the aluminum-magnesium-silicon-based aluminum alloy round bars manufactured by the prior art is generally more than 15 MPa, and the conductivity fluctuation range is more than 0.5% IACS. As can be seen by comparison, the invention can obviously reduce the fluctuation range of the strength and the conductivity of the high-strength aluminum alloy round rod by means of the aluminum alloy liquid in the permanent magnet stirring heat preservation furnace and strictly controlling the rolling and quenching temperatures of the aluminum alloy round rod, and obtain the high-strength aluminum alloy round rod with more uniform performance.
TABLE 2 tensile mechanical Properties and conductivity of high strength aluminum alloy round bars
| Source of refining agent | Example 1 | Example 2 | Example 3 | Example 4 | Example 5 |
| Tensile strength/MPa | 344.8 | 340.5 | 346.8 | 345.9 | 348.2 |
| Yield strength/MPa | 308.8 | 305.4 | 312.6 | 309.6 | 314.5 |
| Elongation after break/% | 8.4 | 8.8 | 8.5 | 8.9 | 8.1 |
| conductivity/%IACS | 55.3 | 55.4 | 55.5 | 55.1 | 55.6 |
The present invention is illustrated by way of example and not limitation, and other variations to the disclosed embodiments, as would be readily apparent to one skilled in the art, are intended to be within the scope of the invention as defined in the claims.
Claims (3)
1. The continuous casting and rolling method for the high-strength aluminum alloy round bar is characterized in that a continuous casting and rolling device adopted by the method sequentially comprises a heat accumulating type gas aluminum melting furnace, a tilting type heat preservation furnace with a permanent magnet stirring device, a double-rotor degassing box, a double-filter plate filter box, a wheel belt type continuous casting machine, an intermediate frequency induction heater, a Y-type continuous rolling machine, a quenching device and a crimping device according to the production process flow, wherein the heat accumulating type gas aluminum melting furnace is connected with the tilting type heat preservation furnace through a launder, the tilting type heat preservation furnace is connected with the double-rotor degassing box through the launder, the double-rotor degassing box is connected with the double-filter plate filter box through the launder, the double-filter plate filter box is connected with the wheel belt type continuous casting machine through the launder, the intermediate frequency induction heater is used for heating an aluminum alloy continuous casting blank conveyed by the wheel belt type continuous casting machine, the Y-type continuous rolling mill is used for continuously rolling an aluminum alloy continuous casting billet heated by an intermediate frequency induction heater into an aluminum alloy round rod, the aluminum alloy round rod passes through a quenching device to be cooled to room temperature and coiled by a crimping device, the permanent magnet stirring device is arranged below a tilting type heat preservation furnace, the dual-rotor degassing box is characterized in that two graphite rotors are arranged side by side in the degassing box, the dual-filter plate filtering box is provided with two foam ceramic filtering plates with different meshes which are arranged front and back in the filtering box, the quenching device is a through pipe with water mist capable of being sprayed inwards around, the permanent magnet stirring device is used in a circulating mode of rotating forwards for 1 minute and then reversing for 1 minute to stir aluminum alloy liquid, the graphite rotors of the dual-rotor degassing box rotate at 400-500 revolutions per minute, and the gas flow rate on the graphite rotors is 3-4 cubic meters per hour, the gas pressure is 0.5-1 MPa, the gas is a mixed gas composed of argon with the purity of more than or equal to 99.9% and chlorine with the purity of more than or equal to 99.9%, the volume percentage of the chlorine is 5-10%, the mesh number of the front foam ceramic filter plates of the double-filter plate filter box is 40 meshes, and the mesh number of the rear foam ceramic filter plates is 80 meshes;
The continuous casting and rolling method sequentially comprises the following steps:
(1) According to the component composition and mass percentage of the high-strength aluminum alloy round rod, aluminum ingots with the purity more than or equal to 99.7 percent, magnesium ingots with the purity more than or equal to 99.9 percent, aluminum silicon alloy, aluminum copper alloy, aluminum manganese alloy and aluminum chromium alloy are selected as raw materials for proportioning;
(2) Heating and melting aluminum ingot at 740-760 ℃ in a heat accumulating type gas aluminum melting furnace to form aluminum liquid;
(3) Transferring the aluminum liquid from the aluminum melting furnace to a tilting type heat preservation furnace with a permanent magnet stirring device through a launder, then adding magnesium ingots, aluminum silicon alloy, aluminum copper alloy, aluminum manganese alloy and aluminum chromium alloy to melt into aluminum alloy liquid, and simultaneously starting the permanent magnet stirring device to stir the aluminum alloy liquid;
(4) After the permanent magnet stirring device is closed, carrying out primary degassing and impurity removal treatment on the aluminum alloy liquid by using argon with the purity of more than or equal to 99.9 percent and a refining agent accounting for 0.1-0.15 percent of the total amount of the aluminum alloy liquid for 15-20 minutes in a blowing refining way, and carrying out slag skimming on the aluminum alloy liquid for 15-20 minutes;
(5) Carrying out secondary degassing and impurity removing treatment on the aluminum alloy liquid by using argon with the purity of more than or equal to 99.9 percent and a refining agent accounting for 0.1-0.15 percent of the total amount of the aluminum alloy liquid for 15-20 minutes in a blowing refining way, and carrying out slag skimming on the aluminum alloy liquid for 20-40 minutes;
(6) Aluminum alloy liquid in the tilting type heat preservation furnace sequentially flows through a double-rotor degassing box and a double-filter plate filter box through a launder to carry out degassing and filtering treatment;
(7) Under the conditions that the temperature of the aluminum alloy liquid is 700-710 ℃ and the line speed of a crystallization wheel of the belt type continuous casting machine is 10-12 m/min, the aluminum alloy liquid flows into the belt type continuous casting machine through a launder to be continuously cast into an aluminum alloy continuous casting blank;
(8) Heating an aluminum alloy continuous casting blank to 490-500 ℃ through an intermediate frequency induction heater;
(9) Feeding the aluminum alloy continuous casting blank into a Y-type continuous rolling mill for continuous rolling into an aluminum alloy round rod with the diameter of 9.5 mm;
(10) Cooling the aluminum alloy round rod to room temperature through a quenching device, and coiling the aluminum alloy round rod through a crimping device to obtain the high-strength aluminum alloy round rod;
the refining agent in the step (4) and the step (5) comprises the following components in percentage by mass: mgCl 2 30-45%，KCl 25-40%，KBF 4 5-10%，K 2 ZrF 6 5-10%，SrCO 3 6-8%，MnCl 2 3-5%，BaCl 2 2-4% of refining agent is prepared by adopting a remelting method, specifically, the refining agent is heated at 80-100 ℃ for 3-4 hours, dried and dehydrated, then remelted at 900-1100 ℃ for 1-2 hours in a vacuum furnace with the vacuum degree of 10-20Pa, cooled and solidified to room temperature, and crushed and screened to obtain the refining agent with the particle size less than or equal to 1 millimeter;
The aluminum alloy round rod consists of the following components in percentage by mass: 0.68-0.78% of Si, 0.65-0.75% of Mg, 0.15-0.25% of Cu, 0.05-0.15% of Mn, 0.05-0.15% of Cr, 0.1-0.2% of Fe, the balance of Al and unavoidable impurities, wherein the single impurity is less than or equal to 0.05%, the total amount of impurities is less than or equal to 0.15%, and the mass ratio of Si to Mg is as follows: si is more than or equal to Mg/1.73+0.3, and the sum of mass percentages of Mn and Cr satisfies the following conditions: mn+Cr is less than or equal to 0.2 percent.
2. The continuous casting and rolling method of the high-strength aluminum alloy round bar according to claim 1, wherein in the step (3), the stirring of the aluminum alloy liquid by starting the permanent magnet stirring device is performed by adopting a circulation mode of forward rotation for 1 minute and then reverse rotation for 1 minute for 15-25 minutes.
3. The continuous casting and rolling method of the high-strength aluminum alloy round bar according to claim 1, wherein the aluminum alloy round bar consists of the following components in percentage by mass: si 0.72%, mg 0.69%, cu 0.21%, mn 0.12%, cr 0.06%, fe 0.14%, the balance Al and unavoidable impurities, the single impurity is less than or equal to 0.05%, the total impurity amount is less than or equal to 0.15%.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211647016.2A CN115896653B (en) | 2022-12-21 | 2022-12-21 | Continuous casting and rolling device and method for high-strength aluminum alloy round rod |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211647016.2A CN115896653B (en) | 2022-12-21 | 2022-12-21 | Continuous casting and rolling device and method for high-strength aluminum alloy round rod |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN115896653A CN115896653A (en) | 2023-04-04 |
| CN115896653B true CN115896653B (en) | 2024-04-02 |
Family
ID=86480733
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202211647016.2A Active CN115896653B (en) | 2022-12-21 | 2022-12-21 | Continuous casting and rolling device and method for high-strength aluminum alloy round rod |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN115896653B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117840406B (en) * | 2024-03-08 | 2024-05-28 | 北京航空航天大学 | Full-automatic casting production line for particle reinforced composite material |
Citations (20)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101078078A (en) * | 2007-06-25 | 2007-11-28 | 中南大学 | Magnesium-aluminum-manganese alloy containing rare earth and preparation method thereof |
| WO2007144186A1 (en) * | 2006-06-16 | 2007-12-21 | Aleris Aluminum Koblenz Gmbh | High damage tolerant aa6/xxx-series alloy for aerospace application. |
| CN101423910A (en) * | 2008-12-12 | 2009-05-06 | 机械科学研究总院先进制造技术研究中心 | Refining agent for aluminum and low magnalium |
| WO2010121517A1 (en) * | 2009-04-24 | 2010-10-28 | 安徽欣意电缆有限公司 | High-elongation rate aluminum alloy material for cable and preparation method thereof |
| CN102041418A (en) * | 2011-01-28 | 2011-05-04 | 江苏中天科技股份有限公司 | Method for manufacturing moderate intensity aluminium alloy wire with 57% electric conductivity |
| CN102549185A (en) * | 2009-09-30 | 2012-07-04 | 株式会社神户制钢所 | Aluminum alloy extrudate with excellent bending crushing strength and corrosion resistance |
| CN102610294A (en) * | 2012-03-20 | 2012-07-25 | 无锡华能电缆有限公司 | Energy-saving strong-strength aluminum alloy wire and manufacturing method thereof |
| CN103320661A (en) * | 2013-05-15 | 2013-09-25 | 陈荣华 | Aluminum alloy sheet material |
| CN104538116A (en) * | 2014-12-16 | 2015-04-22 | 广东省工业技术研究院(广州有色金属研究院) | Method for producing high-strength high-conductivity aluminum alloy conductor |
| CN105838929A (en) * | 2016-03-31 | 2016-08-10 | 广东省材料与加工研究所 | Rare earth aluminum alloy wire and manufacturing method thereof |
| CN106381412A (en) * | 2016-12-01 | 2017-02-08 | 浙江今飞凯达轮毂股份有限公司 | Aluminum alloy refining agent and preparing technology thereof |
| CN107326227A (en) * | 2017-08-14 | 2017-11-07 | 山东南山铝业股份有限公司 | Rail transit vehicle body skirtboard aluminium alloy extrusions and its manufacture method |
| CN108300913A (en) * | 2018-02-08 | 2018-07-20 | 周天国 | A kind of continuous casting and rolling process for production of 5356 aluminum alloy welding bar |
| CN108330354A (en) * | 2018-04-26 | 2018-07-27 | 广东省材料与加工研究所 | A kind of electronic equipment high-strength aluminum alloy and its preparation and pressing method |
| CN108754248A (en) * | 2018-04-26 | 2018-11-06 | 广东省工业分析检测中心 | A kind of overhead stranded conductor aluminium alloy conductor and its manufacturing method |
| CN109022944A (en) * | 2018-07-28 | 2018-12-18 | 河南明泰铝业股份有限公司 | A kind of shell case aluminium alloy plate and its production method |
| CN111575518A (en) * | 2020-05-15 | 2020-08-25 | 包头铝业有限公司 | Fluoride salt complex aluminum alloy refining agent and preparation method thereof |
| CN113369331A (en) * | 2021-06-10 | 2021-09-10 | 云南铝业股份有限公司 | Continuous casting and rolling preparation method of 6061 aluminum alloy round rod |
| CN114000018A (en) * | 2021-10-13 | 2022-02-01 | 马鞍山市新马精密铝业股份有限公司 | 6-series aluminum alloy section for automobile bumper and preparation method thereof |
| KR20220063628A (en) * | 2020-11-10 | 2022-05-17 | 한국재료연구원 | Al-Mg-Si based aluminum alloy and method of manufacturing the same |
-
2022
- 2022-12-21 CN CN202211647016.2A patent/CN115896653B/en active Active
Patent Citations (20)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2007144186A1 (en) * | 2006-06-16 | 2007-12-21 | Aleris Aluminum Koblenz Gmbh | High damage tolerant aa6/xxx-series alloy for aerospace application. |
| CN101078078A (en) * | 2007-06-25 | 2007-11-28 | 中南大学 | Magnesium-aluminum-manganese alloy containing rare earth and preparation method thereof |
| CN101423910A (en) * | 2008-12-12 | 2009-05-06 | 机械科学研究总院先进制造技术研究中心 | Refining agent for aluminum and low magnalium |
| WO2010121517A1 (en) * | 2009-04-24 | 2010-10-28 | 安徽欣意电缆有限公司 | High-elongation rate aluminum alloy material for cable and preparation method thereof |
| CN102549185A (en) * | 2009-09-30 | 2012-07-04 | 株式会社神户制钢所 | Aluminum alloy extrudate with excellent bending crushing strength and corrosion resistance |
| CN102041418A (en) * | 2011-01-28 | 2011-05-04 | 江苏中天科技股份有限公司 | Method for manufacturing moderate intensity aluminium alloy wire with 57% electric conductivity |
| CN102610294A (en) * | 2012-03-20 | 2012-07-25 | 无锡华能电缆有限公司 | Energy-saving strong-strength aluminum alloy wire and manufacturing method thereof |
| CN103320661A (en) * | 2013-05-15 | 2013-09-25 | 陈荣华 | Aluminum alloy sheet material |
| CN104538116A (en) * | 2014-12-16 | 2015-04-22 | 广东省工业技术研究院(广州有色金属研究院) | Method for producing high-strength high-conductivity aluminum alloy conductor |
| CN105838929A (en) * | 2016-03-31 | 2016-08-10 | 广东省材料与加工研究所 | Rare earth aluminum alloy wire and manufacturing method thereof |
| CN106381412A (en) * | 2016-12-01 | 2017-02-08 | 浙江今飞凯达轮毂股份有限公司 | Aluminum alloy refining agent and preparing technology thereof |
| CN107326227A (en) * | 2017-08-14 | 2017-11-07 | 山东南山铝业股份有限公司 | Rail transit vehicle body skirtboard aluminium alloy extrusions and its manufacture method |
| CN108300913A (en) * | 2018-02-08 | 2018-07-20 | 周天国 | A kind of continuous casting and rolling process for production of 5356 aluminum alloy welding bar |
| CN108330354A (en) * | 2018-04-26 | 2018-07-27 | 广东省材料与加工研究所 | A kind of electronic equipment high-strength aluminum alloy and its preparation and pressing method |
| CN108754248A (en) * | 2018-04-26 | 2018-11-06 | 广东省工业分析检测中心 | A kind of overhead stranded conductor aluminium alloy conductor and its manufacturing method |
| CN109022944A (en) * | 2018-07-28 | 2018-12-18 | 河南明泰铝业股份有限公司 | A kind of shell case aluminium alloy plate and its production method |
| CN111575518A (en) * | 2020-05-15 | 2020-08-25 | 包头铝业有限公司 | Fluoride salt complex aluminum alloy refining agent and preparation method thereof |
| KR20220063628A (en) * | 2020-11-10 | 2022-05-17 | 한국재료연구원 | Al-Mg-Si based aluminum alloy and method of manufacturing the same |
| CN113369331A (en) * | 2021-06-10 | 2021-09-10 | 云南铝业股份有限公司 | Continuous casting and rolling preparation method of 6061 aluminum alloy round rod |
| CN114000018A (en) * | 2021-10-13 | 2022-02-01 | 马鞍山市新马精密铝业股份有限公司 | 6-series aluminum alloy section for automobile bumper and preparation method thereof |
Non-Patent Citations (1)
| Title |
|---|
| 高强铝合金棒线材生产工艺分析;姬森;《工具技术》;20210220;第55卷(第2期);57-60 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN115896653A (en) | 2023-04-04 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN106636811B (en) | A kind of high-speed train body aluminium alloy extrusions and its manufacturing method | |
| CN101407876A (en) | Aluminum alloy material for manufacturing large cross section main load-carrying structure member and preparation thereof | |
| CN104805319A (en) | Manufacturing method for 2xxx series ultra-large-dimension aluminum alloy round ingot | |
| CN102409192A (en) | Al-Ti-B-C rare earth refiner and preparation method thereof | |
| CN104975211A (en) | High-conductivity thermal-treatment type medium-strength aluminum alloy conducting filament | |
| CN102816959A (en) | Large-specification aluminum alloy round bar and casting method thereof | |
| CN104103338B (en) | A kind of production technology of cable copper strip | |
| WO2012065453A1 (en) | Preparation method for aluminum-zirconium-titanium-carbon intermediate alloy | |
| CN115821125B (en) | High-conductivity hard aluminum alloy wire and manufacturing method thereof | |
| CN113699398B (en) | Short-process preparation method of high-strength high-toughness corrosion-resistant deformation ZnCuTi plate | |
| CN115798778B (en) | High-conductivity heat-resistant aluminum alloy wire and preparation method thereof | |
| CN113088750B (en) | Copper-iron alloy wire and preparation method thereof | |
| CN115821124B (en) | High heat conduction aluminum alloy for radiator and preparation method thereof | |
| CN115896653B (en) | Continuous casting and rolling device and method for high-strength aluminum alloy round rod | |
| CN114606414A (en) | High-conductivity regenerated aluminum alloy conductor and preparation method thereof | |
| CN115852217A (en) | High-strength easily-extruded aluminum alloy and section extrusion method thereof | |
| CN115948683B (en) | High-strength high-plasticity extruded aluminum alloy and preparation method thereof | |
| CN115786784A (en) | High-strength and high-toughness cast aluminum-silicon-copper-magnesium alloy, and preparation method and application thereof | |
| CN115896469A (en) | Deep degassing, impurity removing and purifying method for electrical aluminum alloy liquid | |
| CN115976371B (en) | Super heat-resistant high-conductivity aluminum alloy wire and preparation method thereof | |
| CN115976375B (en) | Aluminum alloy for solar panel frame and section bar production method thereof | |
| CN115896509B (en) | Preparation method for constructing superfine crystal structure in magnesium alloy | |
| CN115948684B (en) | High-strength high-conductivity aluminum alloy wire and manufacturing method thereof | |
| CN115927924B (en) | High-strength aluminum profile for solar photovoltaic bracket and production method thereof | |
| CN115948681B (en) | Aluminum profile for relieved tooth radiator and extrusion production method thereof |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |