CN105734369B - The heat top casting technique of φ 784mm 7xxx 7 series extra super duralumin alloy poles - Google Patents
The heat top casting technique of φ 784mm 7xxx 7 series extra super duralumin alloy poles Download PDFInfo
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- CN105734369B CN105734369B CN201610255011.3A CN201610255011A CN105734369B CN 105734369 B CN105734369 B CN 105734369B CN 201610255011 A CN201610255011 A CN 201610255011A CN 105734369 B CN105734369 B CN 105734369B
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C21/00—Alloys based on aluminium
- C22C21/10—Alloys based on aluminium with zinc as the next major constituent
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/001—Continuous casting of metals, i.e. casting in indefinite lengths of specific alloys
- B22D11/003—Aluminium alloys
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C1/00—Making non-ferrous alloys
- C22C1/02—Making non-ferrous alloys by melting
- C22C1/026—Alloys based on aluminium
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C1/00—Making non-ferrous alloys
- C22C1/02—Making non-ferrous alloys by melting
- C22C1/03—Making non-ferrous alloys by melting using master alloys
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C1/00—Making non-ferrous alloys
- C22C1/06—Making non-ferrous alloys with the use of special agents for refining or deoxidising
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
- C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
- C22F1/04—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of aluminium or alloys based thereon
- C22F1/053—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of aluminium or alloys based thereon of alloys with zinc as the next major constituent
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Abstract
The invention discloses the heat top casting technique of φ 784mm 7xxx 7 series extra super duralumin alloy poles, the aluminium alloy pole includes following chemical constituent by mass：Si 0.25%；Fe 0.4%；Cu 1.55 1.65%；Mn 0.25%；Mg 2.55 2.65%；Cr 0.19 0.25%；Zn 5.6 5.7%；Ti 0.15%；Zr 0.03%；Al surpluses；Its preparation technology is：A, stock up；B, melting；C, stir；D, refine；E, skim；F, insulation is stood；G, online refinement；H, online degasification；I, filter；J, cast；K, homogenization.When technique disclosed by the invention solves major diameter extra super duralumin alloy using directly condensation foundry engieering, the defects of crackle that often occurs, composition segregation, bright crystal, coarse grain, loose stomata, and made using hot direct casting and solve the defects of surface segregation knurl, coarse-grain thickness.
Description
Technical field
The invention belongs to metal material moulding field, it is related to method for casting aluminium alloy, and in particular to a kind of φ 784mm's
The heat top casting technique of 7xxx 7 series extra super duralumin alloy poles.
Background technology
7xxx line aluminium alloys have high specific strength and hardness, hot-working character carefully, welding performance it is excellent, preferably it is resistance to
The advantages that corrosive nature and higher toughness, preferably it is made into withstanding forces larger structure material, is widely used in Aero-Space
Industry and other civilian industry fields etc..
Although 7xxx line aluminium alloys are better than 6XXX line aluminium alloys, alloy part tensile strength and yield strength energy in intensity
Enough reach more than 400MPa, but tensile strength, yield strength reach more than 400MPa 7XXX line aluminium alloys, through anodic oxygen
After change there is the surface defect such as striped, heterochromatic, beautiful decoration degree is low in surface quality not as 6XXX systems wrought aluminium alloy exquisiteness.And
7xxx systems duralumin, hard alumin ium alloy for producing major diameter is even more to be faced with the metallurgical imperfections such as casting crack, composition segregation, loose stomata.
Domestic many aluminium alloy processing enterprises, which fall over each other, is mounted with large-tonnage extruder, has put 15000MT oil into operation at present
22500MT the biggest in the world hydraulic press is being installed by press, Liaoning Zhong Wang groups, and the casting rod diameter that the extruder uses reaches φ
784mm, it is not yet reported that the superhard alloy casting technique of such major diameter in the document announced at present.So how to produce
Go out the core competitiveness that the major diameter hard alloy that metallurgical quality is high, surface quality is good is each aluminium processing enterprise.
The content of the invention
In view of this, it is an object of the invention to provide a kind of heat top of the 7xxx 7 series extra super duralumin alloy poles of φ 784mm
Casting technique, when technique disclosed by the invention solves major diameter extra super duralumin alloy using directly condensation foundry engieering, often go out
The defects of existing crackle, composition segregation, bright crystal, coarse grain, loose stomata, and made using hot direct casting and solve surface
The defects of pile displacement, coarse-grain thickness, yield rate and production efficiency are substantially increased, reduce casting cost.
To reach above-mentioned purpose, the invention provides following technical scheme：
7xxx 7 series extra super duralumin alloy poles heat top casting technique, the aluminium alloy pole wraps by mass
Containing following chemical constituent：Si 0.25%；Fe 0.4%；Cu 1.55-1.65%；Mn 0.25%；Mg 2.55-2.65%；
Cr0.19-0.25%；Zn 5.6-5.7%；Ti 0.15%；Zr 0.03%；Al surpluses.
Preferably, it is described7xxx 7 series extra super duralumin alloy poles heat top casting technique, its preparation technology includes
Following steps：
A, stock up：Low-iron low-silicon aluminium ingot, alumal, aluminum bronze intermediate alloy ingot, aluminium lead intermediate alloy ingot are chosen by proportioning
And magnesium ingot；
B, melting：Other raw material in addition to magnesium ingot are added into smelting furnace and carry out melting, fusion temperature is 750-765 DEG C, is treated
It is completely melt that refining adds magnesium ingot after skimming；
C, stir：Using magnetic stirrer, ensure in smelting furnace raw material can rapid melting and temperature it is uniform；
D, refine：Refining procedure includes smelting furnace refining and holding furnace refining；
i：Smelting furnace refines：Using high-purity argon gas be carrier carry particle sodium-free refining agent refined, with refining agent with
Liquation mass ratio meter, refining agent dosage are 0.7kg/t, and 740~745 DEG C of refining temperature, refining time is 22~25min；
ii：Holding furnace refines：Using fixed rotary propeller type purifier, the device mainly by graphite bars, graphite rotator, incline
The dynamic most of composition of system and flow control system four, the use of high-purity argon gas is that carrier carrying particle sodium-free refining agent carries out essence
Refining, in terms of refining agent and liquation mass ratio, refining agent dosage is 0.5kg/t, and refining temperature is 730-740 DEG C, and refining time is
15-20min；
E, skim：Remove dross on surface of fusant；
F, insulation is stood：Melt is transferred to holding furnace and carries out insulation standing, controls 720-730 DEG C of holding temperature, the time is
20-30min；
G, online refinement：Al-5Ti-1B alloys are added into melt and carry out micronization processes；This fining agent is domestic thinner than general
Agent nucleating agent is smaller, is more evenly distributed and the impurity content such as iron silicon is lower；
H, online degasification：The melt of isothermal holding is transferred to degasification tank, and the foreign gas in melt is removed using argon gas；
I, filter：Filter progress includes foam ceramic filter and tubular filter：
i:Foam ceramic filter：The melt after degasification is filtered using foamed ceramic filter plate, controls melt temperature during filtering
For 690-700 DEG C；
ii:Tubular filter：After ceramic filter plate, aluminium liquid carries out depth-type filtration by tubular filter, by below 5um
Slag inclusion clearance can reach more than 95%, further ensure the cleanliness factor of melt；
J, cast：Melt injection casting mold after filtering is obtained into aluminium alloy castings, it is 675~685 DEG C to control cast temperature,
Cooling is molded to obtain ingot casting pole；
K, homogenization：Ingot casting pole is placed into homogeneous furnace, 20h is incubated under 475 DEG C of temperature conditionss.
Preferably, the forming step use that cools described in step k scrapes water pond and casting cooling water is scraped off casting rod surface, and casting is cold
But water is not poured directly on casting rod surface, but the water conservancy diversion water pipe by scraping water pond runs out cooling water drainage.
Preferably, the water pond of scraping is located at 160mm under crystallizer.
Preferably, 10~24mm/min of casting speed in step k casting process, 1200~2000l/min of cooling water flow,
0.2~0.4ml/min of batch oil.
Preferably, step i carries out online degasification using triple-spool degasification tank.
Preferably：Initial refining is carried out again after insulation is stood and is skimmed.
The beneficial effects of the present invention are：
1st, the present invention solves the defects of casting crack：Water pond, heat top foundry engieering, online refinement are scraped using use.By
Low in 7xxx superhard alloy freezing points, cold and hot crack tendence is very high, if direct water-cooling casting rod surface in casting process, very
Easily causing casting rod centre burst, especially major diameter pole, surface has solidified but center portion solidification stills need the long period,
If it is too big that direct cooling surface easily causes pole internal-external temperature difference gradient, casting rod cracking, security incident can be caused when serious.
Use of the invention scrapes water pond and casting cooling water is scraped off casting rod surface, and casting cooling water is not poured directly on casting rod surface, but
Cooling water drainage is run out by the water conservancy diversion water pipe for scraping water pond.Casting rod surface temperature is up to 170 DEG C in casting process, straight in casting rod
On the direction of footpath, surface substantially reduces with the center portion temperature difference, and casting internal stress correspondingly reduces a lot, successfully solves casting crack
The problem of；
2nd, the present invention solves the defects of component segregation：Cast the reasonable selection of parameter, electromagnetic agitating technology application,
The correct selection of line thinning technology, follow-up homogenization.Because 7xxx superhard alloys alloying element is high, various metallic element alloys
Solidified when meeting different and cause casting rod composition gross segregation, particularly with major diameter casting rod, surfaces externally and internally intensity of cooling is different,
Component segregation is even more serious.In casting industry, some laboratory best results are 13%@φ 600mm x 7075 of segregation.This hair
It is bright just to be taken measures from processes such as aluminium liquid melting, insulation standings, for example aluminium liquid and the alloy of addition are entered using magnetic stirrer
Row is sufficiently stirred, farthest uniform alloy；In casting process, reasonable selection casting parameter, optimally design cold
But the casting technological parameter that the intensity three of casting temperature, speed and intensity of cooling (matching) present invention uses is：Casting temperature
675~685 DEG C, 10~24mm/min of casting speed, 1200~2000l/min of cooling water flow；The use of online refinement agent makes
Obtain aluminium liquid to come into force in optimal entry-into-force time 3min, reduce to greatest extent due to component segregation caused by coarse grains；By
It is the process of chilling when aluminium bar is cast, casting rod is transgranular and crystal ingedient segregation can be larger, so the present invention proposes to tie in casting
Shu Hou, casting rod are placed into homogeneous furnace, high temperature homogenizing annealing, and homogeneous system is 475 DEG C of insulation 20hr, makes casting rod crystal boundary and crystalline substance
Interior chemical composition is uniform, at utmost reduces transgranular, region component segregation defect；
3rd, the present invention solves the defects of bright crystal, coarse-grain, loose stomata：Rational casting temperature, online refinement skill
The use of art, degasification tank, because 7xxx superhard alloy freezing points are low, so temperature can not set too high during casting, otherwise hold very much
Easily causing Lou aluminium causes security incident, but temperature is low and can cause casting rod bright crystal, the casting rod performance meeting for having bright crystal
Reduce a lot, especially hard alloy absolutely not allows casting rod bright crystal to be present, so the present invention have selected rational casting temperature
675~685 DEG C of degree, the problem of aluminium is leaked in casting process was both avoided and in turn ensure that casting rod does not produce bright crystal；Casting rod it is another
Outer some internal flaws such as overwhelming majority such as coarse-grain, loose stomata be all due to casting temperature height or online refinement effect not
Good and aluminium liquid cleanliness factor is inadequate, so the present invention is in implementation process, it is ensured that the aluminium water quality of high-cleanness, high, use Al-
5Ti-1B alloy refinement agent, this fining agent are more smaller than general domestic fining agent nucleating agent, are more evenly distributed and iron silicon etc.
Impurity content is lower, there is more preferable grain refining effect, while carries out abundant degasification using triple-spool degasification tank, completely solves
These internal flaws.
4. the present invention solves the defects of surface segregation knurl and coarse-grain thickness：Casting crack is avoided using water pond is scraped, together
When on the premise of ensureing not crack, can be by increasing intensity of cooling, improving casting speed and the rational casting of setting
The usage amount of oil, obtain smooth casting rod surface and relatively thin coarse-grain layer, 10~24mm/min of casting speed being used in the present invention,
1200~2000l/min of cooling water flow, batch oil 0.3ml/min.Casting rod does not need railway carriage before extrusion, yield rate and
Production efficiency greatly improves.
Brief description of the drawings
In order that the purpose of the present invention, technical scheme and beneficial effect are clearer, the present invention provides drawings described below：
Fig. 1 represents φ 784mm 7xxx 7 series extra super duralumin alloy pole process charts；
Fig. 2 represents produced major diameter pole.
Embodiment
The preferred embodiments of the present invention are described in detail below.The experiment side of unreceipted actual conditions in embodiment
Method, generally according to normal condition or according to the condition proposed by manufacturer.
The 7xxx 7 series extra super duralumin alloy pole works for the φ 784mm that the embodiment reference picture 1 of following examples represents
Skill flow chart；
Embodiment 1
7xxx 7 series extra super duralumin alloy poles heat top casting technique, the aluminium alloy pole wraps by mass
Containing following chemical constituent：Si 0.25%；Fe 0.4%；Cu 1.6%；Mn 0.25%；Mg 2.6%；Cr0.2%；Zn
5.6%；Ti 0.15%；Zr 0.03%；Al surpluses.
Its preparation technology comprises the following steps：
A, stock up：Low-iron low-silicon aluminium ingot, alumal, aluminum bronze intermediate alloy ingot, aluminium lead intermediate alloy ingot are chosen by proportioning
And magnesium ingot；
B, melting：Other raw material in addition to magnesium ingot are added into smelting furnace and carry out melting, fusion temperature is 760 DEG C, is treated completely
Melting refinement adds magnesium ingot after skimming；
C, stir：Using magnetic stirrer, ensure in smelting furnace raw material can rapid melting and temperature it is uniform；
D, refine：Refining procedure includes smelting furnace refining and holding furnace refining；
i：Smelting furnace refines：Using high-purity argon gas be carrier carry particle sodium-free refining agent refined, with refining agent with
Liquation mass ratio meter, refining agent dosage are 0.7kg/t, 745 DEG C of refining temperature, and control refining agent uniformly sprays during refining, and
In refining process, operator moves refining dolly, its refining each corner in stove is all reached refining effect, refining time
For 22min；
ii：Holding furnace refines：Using fixed rotary propeller type purifier, the device mainly by graphite bars, graphite rotator, incline
The dynamic most of composition of system and flow control system four, due to aluminium liquid in smelting furnace it is refined, be incubated furnace refining master
To pollute and caused metal and nonmetal oxide slag inclusion, make for secondary slag making during turning water from melting ＆ holding furnace aluminium liquid
It is that carrier carrying particle sodium-free refining agent is refined with high-purity argon gas, in terms of refining agent and liquation mass ratio, refining agent dosage
For 0.5kg/t, refining temperature is 730 DEG C, refining time 20min, is similarly also required to give very each corner of holding furnace
Good refining；
E, skim：Remove dross on surface of fusant；
F, insulation is stood：After composition is qualified, melt is transferred to holding furnace and carries out insulation standing, controls holding temperature 730
DEG C, time 20min；
G, online refinement：Al-5Ti-1B alloys are added into melt and carry out micronization processes；
H, online degasification：The melt of isothermal holding is transferred to triple-spool degasification tank and carries out online degasification, and is removed using argon gas
The foreign gas gone in melt；
I, filter：Filter progress includes foam ceramic filter and tubular filter：
i:Foam ceramic filter：The melt after degasification is filtered using foamed ceramic filter plate, controls melt temperature during filtering
For 690 DEG C；
ii:Tubular filter：After ceramic filter plate, aluminium liquid carries out depth-type filtration by tubular filter, by below 5um
Slag inclusion clearance can reach more than 95%, further ensure the cleanliness factor of melt；
J, cast：Melt injection casting mold after filtering is obtained into aluminium alloy castings, it is 680 DEG C to control cast temperature, cooling
It is molded to obtain ingot casting pole；The cooling forming step use scrapes water pond and casting cooling water is scraped off casting rod surface, casts cooling water
Do not pour directly on casting rod surface, but the water conservancy diversion water pipe by scraping water pond runs out cooling water drainage；In step k casting process
10~24mm/min of casting speed, 1200~2000l/min of cooling water flow, low water is used when low velocity is cast in casting process
Flow, high water-carrying capacity is used during high speed, so as to the generation of Crack prevention；0.2~0.4ml/min of batch oil；Scrape water pond position
The 160mm under crystallizer；
K, homogenization：Ingot casting pole is placed into homogeneous furnace, 20h is incubated under 475 DEG C of temperature conditionss.
Embodiment 2
7xxx 7 series extra super duralumin alloy poles heat top casting technique, the aluminium alloy pole wraps by mass
Containing following chemical constituent：Si 0.25%；Fe 0.4%；Cu 1.55%；Mn 0.25%；Mg 2.55%；Cr0.19%；Zn
5.6%；Ti 0.15%；Zr 0.03%；Al surpluses.
Its preparation technology comprises the following steps：
A, stock up：Low-iron low-silicon aluminium ingot, alumal, aluminum bronze intermediate alloy ingot, aluminium lead intermediate alloy ingot are chosen by proportioning
And magnesium ingot；
B, melting：Other raw material in addition to magnesium ingot are added into smelting furnace and carry out melting, fusion temperature is 755 DEG C, is treated completely
Melting refinement adds magnesium ingot after skimming；
C, stir：Using magnetic stirrer, ensure in smelting furnace raw material can rapid melting and temperature it is uniform；
D, refine：Refining procedure includes smelting furnace refining and holding furnace refining；
i：Smelting furnace refines：Using high-purity argon gas be carrier carry particle sodium-free refining agent refined, with refining agent with
Liquation mass ratio meter, refining agent dosage are 0.7kg/t, 740 DEG C of refining temperature, and control refining agent uniformly sprays during refining, and
In refining process, operator moves refining dolly, its refining each corner in stove is all reached refining effect, refining time
For 25min；
ii：Holding furnace refines：Using fixed rotary propeller type purifier, the device mainly by graphite bars, graphite rotator, incline
The dynamic most of composition of system and flow control system four, due to aluminium liquid in smelting furnace it is refined, be incubated furnace refining master
To pollute and caused metal and nonmetal oxide slag inclusion, make for secondary slag making during turning water from melting ＆ holding furnace aluminium liquid
It is that carrier carrying particle sodium-free refining agent is refined with high-purity argon gas, in terms of refining agent and liquation mass ratio, refining agent dosage
For 0.5kg/t, refining temperature is 730 DEG C, refining time 20min, is similarly also required to give very each corner of holding furnace
Good refining；
E, skim：Remove dross on surface of fusant；
F, insulation is stood：After composition is qualified, melt is transferred to holding furnace and carries out insulation standing, controls holding temperature 730
DEG C, time 20min；Initial refining is carried out again after insulation is stood and is skimmed；
G, online refinement：Al-5Ti-1B alloys are added into melt and carry out micronization processes；
H, online degasification：The melt of isothermal holding is transferred to triple-spool degasification tank and carries out online degasification, and is removed using argon gas
The foreign gas gone in melt；
I, filter：Filter progress includes foam ceramic filter and tubular filter：
i:Foam ceramic filter：The melt after degasification is filtered using foamed ceramic filter plate, controls melt temperature during filtering
For 700 DEG C；
ii:Tubular filter：After ceramic filter plate, aluminium liquid carries out depth-type filtration by tubular filter, by below 5um
Slag inclusion clearance can reach more than 95%, further ensure the cleanliness factor of melt；
J, cast：Melt injection casting mold after filtering is obtained into aluminium alloy castings, it is 685 DEG C to control cast temperature, cooling
It is molded to obtain ingot casting pole；The cooling forming step use scrapes water pond and casting cooling water is scraped off casting rod surface, casts cooling water
Do not pour directly on casting rod surface, but the water conservancy diversion water pipe by scraping water pond runs out cooling water drainage；In step k casting process
10~24mm/min of casting speed, 1200~2000l/min of cooling water flow, low water is used when low velocity is cast in casting process
Flow, high water-carrying capacity is used during high speed, so as to the generation of Crack prevention；0.2~0.4ml/min of batch oil；Scrape water pond position
The 160mm under crystallizer；
K, homogenization：Ingot casting pole is placed into homogeneous furnace, 20h is incubated under 475 DEG C of temperature conditionss.
Prepared7xxx 7 series extra super duralumin alloy poles it is as shown in Figure 2：Embodiment 1 and embodiment 2 is made
Standby aluminium alloy is detected, and the aluminium alloy property indices prepared by embodiment 1 and embodiment 2 meet diameter and are more than
The service index of 700mm aluminium alloy, and do not occur the defects of casting crack substantially, the Segregation of Chemical Composition of gained bar
Very low, diametrically, edge to center portion, Zn maximum deviations only have 0.002%；Thick crystal layer thickness is far below conventional cast side
The thickness of method, and inside casting rod the defects of no loose, stomata, slag inclusion.
Finally illustrate, preferred embodiment above is merely illustrative of the technical solution of the present invention and unrestricted, although logical
Cross above preferred embodiment the present invention is described in detail, it is to be understood by those skilled in the art that can be
Various changes are made to it in form and in details, without departing from claims of the present invention limited range.
Claims (4)
1. the heat top casting technique of φ 784mm 7xxx 7 series extra super duralumin alloy poles, it is characterised in that：The aluminium alloy pole is pressed
Quality meter includes following chemical constituent：Si 0.25%；Fe 0.4%；Cu 1.55-1.65%；Mn 0.25%；Mg
2.55-2.65%；Cr 0.19-0.25%；Zn 5.6-5.7%；Ti 0.15%；Zr 0.03%；Al surpluses；Its preparation technology
Comprise the following steps：
A, stock up：Low-iron low-silicon aluminium ingot, alumal, aluminum bronze intermediate alloy ingot, aluminium zinc intermediate alloy ingot and magnesium are chosen by proportioning
Ingot；
B, melting：Other raw material in addition to magnesium ingot are added into smelting furnace and carry out melting, fusion temperature is 755-765 DEG C, is treated completely
Melting refinement adds magnesium ingot after skimming；
C, stir：Using magnetic stirrer, ensure in smelting furnace raw material can rapid melting and temperature it is uniform；
D, refine：Refining procedure includes smelting furnace refining and holding furnace refining：
d1）Smelting furnace refines：The use of high-purity argon gas is that carrier carrying particle sodium-free refining agent is refined, with refining agent and liquation
Mass ratio meter, refining agent dosage are 0 .7kg/t, and 740~745 DEG C of refining temperature, refining time is 22~25min；
d2）Holding furnace refines：Using fixed rotary propeller type purifier, the device mainly by graphite bars, graphite rotator, fascinating is
System and the most of composition of flow control system four, the use of high-purity argon gas is that carrier carrying particle sodium-free refining agent carries out essence
Refining,
In terms of refining agent and liquation mass ratio, refining agent dosage is 0 .5kg/t, and refining temperature is 730-740 DEG C, refining time
For 15-
20min；
E, skim：Remove dross on surface of fusant；
F, insulation is stood：Melt is transferred to holding furnace and carries out insulation standing, controls 720-730 DEG C of holding temperature, time 20-
30min；
G, online refinement：Al-5Ti-1B alloys are added into melt and carry out micronization processes；
H, online degasification：The melt of isothermal holding is transferred to degasification tank, and the foreign gas in melt is removed using argon gas；
I, filter：Filter progress includes foam ceramic filter and tubular filter：
i1）Foam ceramic filter：The melt after degasification is filtered using foamed ceramic filter plate, controls during filtering the melt temperature to be
690-700℃；
i2）Tubular filter：After ceramic filter plate, aluminium liquid carries out depth-type filtration by tubular filter, by the folder below 5 μm
Slag clearance can reach more than 95%, further ensure the cleanliness factor of melt；
J, cast：Melt injection casting mold after filtering is obtained into aluminium alloy castings, it is 675~685 DEG C to control cast temperature, cooling
It is molded to obtain ingot casting pole；
K, homogenization：Ingot casting pole is placed into homogeneous furnace, 20h is incubated under 475 DEG C of temperature conditionss；
The forming step use that cools described in step j scrapes water pond and casting cooling water is scraped off casting rod surface, and casting cooling water is not direct
Pour on casting rod surface, but the water conservancy diversion water pipe by scraping water pond runs out cooling water drainage, the water pond of scraping is located at crystallizer
Lower 160mm.
2. the heat top casting technique of φ 784mm 7xxx 7 series extra super duralumin alloy poles, its feature exist according to claim 1
In：10~24mm/min of casting speed in step j casting process, 1200~2000l/min of cooling water flow, batch oil 0.2
~0 .4ml/min.
3. the heat top casting technique of φ 784mm 7xxx 7 series extra super duralumin alloy poles, its feature exist according to claim 1
In step h carries out online degasification using triple-spool degasification tank.
4. the heat top casting technique of φ 784mm 7xxx 7 series extra super duralumin alloy poles, its feature exist according to claim 1
In：Initial refining is carried out again after insulation is stood and is skimmed.
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| CN104328316B (en) * | 2014-10-15 | 2017-09-15 | 云南云铝润鑫铝业有限公司 | A kind of production method of the aluminium alloy round cast ingot base of major diameter 6063 |
| CN104561704A (en) * | 2015-02-09 | 2015-04-29 | 辽宁忠旺集团有限公司 | Process for producing large-size 7055 aluminum alloy round ingot |
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