CN109013734B - Extrusion preparation method of titanium alloy thin-wall section - Google Patents
Extrusion preparation method of titanium alloy thin-wall section Download PDFInfo
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- 238000001125 extrusion Methods 0.000 title claims abstract description 90
- 229910001069 Ti alloy Inorganic materials 0.000 title claims abstract description 36
- 238000002360 preparation method Methods 0.000 title claims abstract description 22
- 238000000034 method Methods 0.000 claims abstract description 17
- 238000005242 forging Methods 0.000 claims abstract description 12
- 239000011248 coating agent Substances 0.000 claims abstract description 11
- 238000000576 coating method Methods 0.000 claims abstract description 11
- 238000003723 Smelting Methods 0.000 claims abstract description 6
- 239000000314 lubricant Substances 0.000 claims abstract description 6
- 230000003287 optical effect Effects 0.000 claims description 25
- 238000010438 heat treatment Methods 0.000 claims description 17
- 238000000137 annealing Methods 0.000 claims description 15
- 238000005266 casting Methods 0.000 claims description 12
- 230000003064 anti-oxidating effect Effects 0.000 claims description 10
- 238000003754 machining Methods 0.000 claims description 10
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims description 10
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical group [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 6
- 229910002804 graphite Inorganic materials 0.000 claims description 6
- 239000010439 graphite Substances 0.000 claims description 6
- CWQXQMHSOZUFJS-UHFFFAOYSA-N molybdenum disulfide Chemical compound S=[Mo]=S CWQXQMHSOZUFJS-UHFFFAOYSA-N 0.000 claims description 6
- 229910052982 molybdenum disulfide Inorganic materials 0.000 claims description 6
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 5
- 239000002253 acid Substances 0.000 claims description 5
- 238000004140 cleaning Methods 0.000 claims description 5
- 238000001816 cooling Methods 0.000 claims description 5
- 238000001035 drying Methods 0.000 claims description 5
- 230000006698 induction Effects 0.000 claims description 5
- 230000001050 lubricating effect Effects 0.000 claims description 5
- 238000003801 milling Methods 0.000 claims description 5
- 239000003345 natural gas Substances 0.000 claims description 5
- 239000011253 protective coating Substances 0.000 claims description 5
- 238000005488 sandblasting Methods 0.000 claims description 5
- 238000004381 surface treatment Methods 0.000 claims description 5
- 238000005406 washing Methods 0.000 claims description 5
- 229910000831 Steel Inorganic materials 0.000 claims description 3
- 239000000463 material Substances 0.000 claims description 3
- 239000010959 steel Substances 0.000 claims description 3
- 230000007704 transition Effects 0.000 claims description 3
- 230000008569 process Effects 0.000 abstract description 8
- 238000004519 manufacturing process Methods 0.000 description 7
- 230000008859 change Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000004075 alteration Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
- B21C25/00—Profiling tools for metal extruding
- B21C25/02—Dies
- B21C25/025—Selection of materials therefor
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
- B21C23/00—Extruding metal; Impact extrusion
- B21C23/32—Lubrication of metal being extruded or of dies, or the like, e.g. physical state of lubricant, location where lubricant is applied
-
- 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
- C22F1/02—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working in inert or controlled atmosphere or vacuum
-
- 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
- C22F1/16—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of other metals or alloys based thereon
- C22F1/18—High-melting or refractory metals or alloys based thereon
- C22F1/183—High-melting or refractory metals or alloys based thereon of titanium or alloys based thereon
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Materials Engineering (AREA)
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- Organic Chemistry (AREA)
- Extrusion Of Metal (AREA)
- Forging (AREA)
- Cleaning And De-Greasing Of Metallic Materials By Chemical Methods (AREA)
Abstract
The invention provides an extrusion preparation method of a titanium alloy thin-wall section. Smelting a TC4 titanium alloy cast ingot with phi 710mm, forging the cast ingot into a bar blank with phi 220 multiplied by L mm, preheating an extrusion cylinder, an extrusion die and an extrusion pad at the preheating temperature of 300-500 ℃, and then coating a lubricant on an extrusion tool; rapidly transferring the bar blank into an extrusion cylinder, wherein the transferring time is less than 1min, and the extrusion speed is 120-300 mm/S; and preparing the titanium alloy section. The extrusion preparation method of the titanium alloy thin-wall section provided by the embodiment of the invention not only realizes the extrusion preparation of the thin-wall small-section on a large-tonnage extruder, but also greatly reduces the die cost, the personnel cost, the equipment operation cost and the like; compared with the traditional process, the method does not need to add working procedures or special treatment processes, has strong operability, and can realize the extrusion of the titanium alloy section with all the current section shapes.
Description
Technical Field
The invention relates to the technical field of preparation of titanium alloy sections, in particular to an extrusion preparation method of a titanium alloy thin-wall section.
Background
Titanium alloy section bar products at home and abroad are produced by adopting an extrusion and shape righting process, at present, only one section bar can be extruded by one extrusion die during section bar extrusion, only one section bar can be prepared in one extrusion process, and the die has the advantages of high consumption, low utilization rate, low production efficiency and high equipment operation and personnel cost.
The titanium alloy section bar preparation technology of the related technology has the advantages of large extrusion die consumption, low production efficiency, high equipment operation and personnel cost and long production period. Therefore, the titanium alloy section has higher manufacturing cost and long production period.
Disclosure of Invention
In order to solve the technical problem, the invention provides an extrusion preparation method of a titanium alloy thin-wall section.
The technical scheme of the invention is as follows:
an extrusion preparation method of a titanium alloy thin-wall section comprises the following steps:
step 1, smelting a TC4 titanium alloy phi 710mm cast ingot by using a vacuum consumable electrode arc furnace for 2 times; carrying out planning and milling treatment on the cast ingot, wherein the test phase transition point is 970-1000 ℃;
step 2, after the ingot casting in the step 1 is coated with the anti-oxidation protective coating, heating the ingot casting in a natural gas furnace, forging the ingot casting into a bar blank with phi 220 multiplied by L mm on a 2500-ton quick forging machine, forging the bar blank for 2-3 times of fire at 1180-1200 ℃, and forging the bar blank for 1-2 times of fire in a (alpha + beta) two-phase region, wherein the total deformation is ensured to be more than 50%;
step 3, machining the rod blank in the step 2 to obtain an optical rod blank with the phi of 216 multiplied by 350 mm;
step 4, cleaning the optical rod blank prepared in the step 3 by using alcohol, placing the optical rod blank in a resistance furnace, drying the optical rod blank for 15 minutes at the temperature of 250 ℃, and taking out the optical rod blank to perform anti-oxidation coating treatment;
step 5, heating the bar blank obtained in the step 4 to 1000-1200 ℃ in an induction heating furnace, and keeping the temperature for 30 min;
preheating an extrusion cylinder, an extrusion die and an extrusion pad, wherein the extrusion die is a dual-die-hole extrusion die, the preheating temperature is 300-500 ℃, and then, coating and lubricating an extrusion tool by using a lubricant;
step 7, quickly transferring the bar blank heated in the step 5 into an extrusion cylinder, wherein the transfer time is less than 1min, and the extrusion speed is 120-300 mm/S;
step 8, placing the section extruded in the step 7 in a vacuum annealing furnace for annealing treatment; annealing at 680-760 ℃, keeping the temperature for 1-3 h, and air cooling;
step 9, straightening the section bar after the heat treatment in the step 8 in a straightening pressure straightening mode;
and step 10, performing surface treatment on the section straightened in the step 9, performing sand blasting, and then performing acid washing to prepare the titanium alloy section.
Preferably, the cross section of the extrusion die is L-shaped or T-shaped, the number of the die holes is 2, the die holes are symmetrically distributed on two sides of the axis of the extrusion die, and the machining precision of the die holes is +/-0.1 mm.
Preferably, the material of the extrusion die is 3Cr2W8V heat-resistant die steel.
Preferably, the lubricant is graphite and molybdenum disulfide.
Preferably, the profile is straightened by adopting a pressure straightening mode.
The extrusion preparation method of the titanium alloy thin-wall section provided by the embodiment of the invention not only realizes the extrusion preparation of the thin-wall small-section on a large-tonnage extruder, but also greatly reduces the die cost, the personnel cost, the equipment operation cost and the like; compared with the traditional process, the method does not need to add working procedures or special treatment processes, has strong operability, and can realize the extrusion of the titanium alloy section with all the current section shapes. Through practical application, the section prepared by the method has high dimensional precision, good surface quality, good appearance shape and the like, and well meets the extrusion production of the titanium alloy section.
Drawings
FIG. 1 is a cross-sectional view of a titanium alloy profile according to a first embodiment;
fig. 2 is a sectional view of the titanium alloy profile shown in example two.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments made by those skilled in the art without any inventive work based on the embodiments of the present invention belong to the protection scope of the present invention.
Example one
Referring to fig. 1, in the first embodiment, an L-shaped profile is prepared by using an extrusion die with an L-shaped die hole, and the wall thickness of the L-shaped profile is 1.6mm, and the specific preparation method comprises the following steps:
step 1, smelting a TC4 titanium alloy cast ingot with phi 710mm by using a vacuum consumable electrode arc furnace for 2 times. Carrying out planning and milling treatment on the cast ingot, wherein the test phase change point is 990-1000 ℃;
step 2, after the ingot casting in the step 1 is coated with the anti-oxidation protective coating, the ingot casting is heated in a natural gas furnace and then forged into a bar blank with phi 220 multiplied by L mm on a 2500-ton quick forging machine, the bar blank is forged for 2-3 times at 1200 ℃, and the (alpha + beta) two-phase region is forged for 1-2 times, so that the total deformation is ensured to be more than 50%;
step 3, machining the rod blank in the step 2 to obtain an optical rod blank with the phi of 216 multiplied by 350 mm;
step 4, cleaning the optical rod blank prepared in the step 3 by using alcohol, placing the optical rod blank in a resistance furnace, drying the optical rod blank for 15 minutes at the temperature of 250 ℃, and taking out the optical rod blank to perform anti-oxidation coating treatment;
step 5, heating the bar blank obtained in the step 4 to 1050-1200 ℃ in an induction heating furnace, and keeping the temperature for 30 min;
step 6, preheating the extrusion cylinder, the extrusion die and the extrusion pad at the preheating temperature of 300-500 ℃, and then coating and lubricating the extrusion tool by using graphite and molybdenum disulfide;
step 7, quickly transferring the bar blank heated in the step 5 into an extrusion cylinder, wherein the transfer time is less than 1min, and the extrusion speed is 120-300 mm/S;
step 8, placing the section extruded in the step 7 in a vacuum annealing furnace for annealing treatment; annealing at 700-760 ℃, keeping the temperature for 1-3 h, and air cooling;
step 9, straightening the section bar after the heat treatment in the step 8;
and 10, carrying out surface treatment on the section straightened in the step 9, carrying out sand blasting and then carrying out acid washing to obtain the titanium alloy section shown in the figure 1.
In this embodiment, the extrusion die is a dual-die-hole extrusion die, the die hole structure of the cross section of the extrusion die is L-shaped, the number of the L-shaped die holes is 2, the L-shaped die holes are symmetrically distributed on two sides of the axis of the extrusion die, and the machining precision of the die holes is +/-0.1 mm.
The material of the extrusion die adopts 3Cr2W8V heat-resistant die steel.
The lubricant is graphite and molybdenum disulfide.
Specifically, a pressure straightening mode is adopted to straighten the profile.
Example two
Referring to fig. 2, in the second embodiment, an L-shaped profile is prepared by using an extrusion die with an L-shaped die hole, and the thickness of one side wall of the L-shaped profile is 1.6mm, and the thickness of the other side wall of the L-shaped profile is 2.1mm, and the specific preparation method comprises the following steps:
step 1, smelting a TC4 titanium alloy phi 710mm cast ingot by using a vacuum consumable electrode arc furnace for 2 times; carrying out planning and milling treatment on the cast ingot, wherein the test phase transition point is 970-980 ℃;
step 2, after the ingot casting in the step 1 is coated with the anti-oxidation protective coating, the ingot casting is heated in a natural gas furnace and then forged into a bar blank with phi 220 multiplied by L mm on a 2500-ton quick forging machine, the bar blank is forged for 2-3 times of fire at 1180 ℃, and the (alpha + beta) two-phase region is forged for 1-2 times of fire, so that the total deformation is ensured to be more than 50%;
step 3, machining the rod blank in the step 2 to obtain an optical rod blank with the phi of 216 multiplied by 350 mm;
step 4, cleaning the optical rod blank prepared in the step 3 by using alcohol, placing the optical rod blank in a resistance furnace, drying the optical rod blank for 15 minutes at the temperature of 250 ℃, and taking out the optical rod blank to perform anti-oxidation coating treatment;
step 5, heating the bar blank obtained in the step 4 to 1000-1150 ℃ in an induction heating furnace, and keeping the temperature for 30 min;
step 6, preheating the extrusion cylinder, the extrusion die and the extrusion pad at the preheating temperature of 300-500 ℃, and then coating and lubricating the extrusion tool by using graphite and molybdenum disulfide;
step 7, quickly transferring the bar blank heated in the step 5 into an extrusion cylinder, wherein the transfer time is less than 1min, and the extrusion speed is 120-300 mm/S;
and 8, placing the section extruded in the step 7 in a vacuum annealing furnace for annealing treatment. Annealing at 680-740 ℃, keeping the temperature for 1-3 h, and air cooling;
step 9, straightening the section bar after the heat treatment in the step 8;
and 10, carrying out surface treatment on the section straightened in the step 9, carrying out sand blasting and then carrying out acid washing to obtain the titanium alloy section shown in the figure 2.
In this embodiment, the extrusion die is a dual-die-hole extrusion die, the die hole structure of the cross section of the extrusion die is L-shaped, the number of the L-shaped die holes is 2, the L-shaped die holes are symmetrically distributed on two sides of the axis of the extrusion die, and the machining precision of the die holes is +/-0.1 mm.
EXAMPLE III
In the third embodiment, a T-shaped section is prepared by using an extrusion die with a T-shaped die hole, and the specific preparation method comprises the following steps:
step 1, smelting a TC4 titanium alloy cast ingot with phi 710mm by using a vacuum consumable electrode arc furnace for 2 times. Carrying out planning and milling treatment on the cast ingot, wherein the test phase change point is 990-1000 ℃;
step 2, after the ingot casting in the step 1 is coated with the anti-oxidation protective coating, the ingot casting is heated in a natural gas furnace and then forged into a bar blank with phi 220 multiplied by L mm on a 2500-ton quick forging machine, the bar blank is forged for 2-3 times at 1200 ℃, and the (alpha + beta) two-phase region is forged for 1-2 times, so that the total deformation is ensured to be more than 50%;
step 3, machining the rod blank in the step 2 to obtain an optical rod blank with the phi of 216 multiplied by 350 mm;
step 4, cleaning the optical rod blank prepared in the step 3 by using alcohol, placing the optical rod blank in a resistance furnace, drying the optical rod blank for 15 minutes at the temperature of 250 ℃, and taking out the optical rod blank to perform anti-oxidation coating treatment;
step 5, heating the bar blank obtained in the step 4 to 1050-1200 ℃ in an induction heating furnace, and keeping the temperature for 30 min;
step 6, preheating the extrusion cylinder, the extrusion die and the extrusion pad at the preheating temperature of 300-500 ℃, and then coating and lubricating the extrusion tool by using graphite and molybdenum disulfide;
step 7, quickly transferring the bar blank heated in the step 5 into an extrusion cylinder, wherein the transfer time is less than 1min, and the extrusion speed is 120-300 mm/S;
and 8, placing the section extruded in the step 7 in a vacuum annealing furnace for annealing treatment. Annealing at 700-760 ℃, keeping the temperature for 1-3 h, and air cooling;
step 9, straightening the section bar after the heat treatment in the step 8;
and 10, carrying out surface treatment on the section straightened in the step 9, carrying out sand blasting firstly, and then carrying out acid washing.
In this embodiment, the extrusion die is a dual-die-hole extrusion die, the die hole structure of the cross section of the extrusion die is T-shaped, the number of the T-shaped die holes is 2, the T-shaped die holes are symmetrically distributed on two sides of the axis of the extrusion die, and the machining precision of the die holes is +/-0.1 mm.
The extrusion preparation method of the titanium alloy thin-wall section provided by the embodiment of the invention not only realizes the extrusion preparation of the thin-wall small-section on a large-tonnage extruder, but also greatly reduces the die cost, the personnel cost, the equipment operation cost and the like; compared with the traditional process, the method does not need to add working procedures or special treatment processes, has strong operability, and can realize the extrusion of the titanium alloy section with all the current section shapes. Through practical application, the section prepared by the method has high dimensional precision, good surface quality, good appearance shape and the like, and well meets the extrusion production of the titanium alloy section.
Although the present invention has been described with reference to the preferred embodiments, it should be understood that various changes, substitutions and alterations can be made herein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (5)
1. The extrusion preparation method of the titanium alloy thin-wall section is characterized by comprising the following steps:
step 1, smelting a TC4 titanium alloy phi 710mm cast ingot by using a vacuum consumable electrode arc furnace for 2 times; carrying out planning and milling treatment on the cast ingot, wherein the test phase transition point is 970-1000 ℃;
step 2, after the ingot casting in the step 1 is coated with the anti-oxidation protective coating, heating the ingot casting in a natural gas furnace, forging the ingot casting into a bar blank with phi 220 multiplied by L mm on a 2500-ton quick forging machine, forging the bar blank for 2-3 times of fire at 1180-1200 ℃, and forging the bar blank for 1-2 times of fire in a (alpha + beta) two-phase region, wherein the total deformation is ensured to be more than 50%;
step 3, machining the rod blank in the step 2 to obtain an optical rod blank with the phi of 216 multiplied by 350 mm;
step 4, cleaning the optical rod blank prepared in the step 3 by using alcohol, placing the optical rod blank in a resistance furnace, drying the optical rod blank for 15 minutes at the temperature of 250 ℃, and taking out the optical rod blank to perform anti-oxidation coating treatment;
step 5, heating the bar blank obtained in the step 4 to 1000-1200 ℃ in an induction heating furnace, and keeping the temperature for 30 min;
preheating an extrusion cylinder, an extrusion die and an extrusion pad, wherein the extrusion die is a dual-die-hole extrusion die, the preheating temperature is 300-500 ℃, and then, coating and lubricating an extrusion tool by using a lubricant;
step 7, quickly transferring the bar blank heated in the step 5 into an extrusion cylinder, wherein the transfer time is less than 1min, and the extrusion speed is 120-300 mm/S;
step 8, placing the section extruded in the step 7 in a vacuum annealing furnace for annealing treatment; annealing at 680-760 ℃, keeping the temperature for 1-3 h, and air cooling;
step 9, straightening the section bar after the heat treatment in the step 8;
and 10, performing surface treatment on the section straightened in the step 9, performing sand blasting, and then performing acid washing to prepare a titanium alloy section, and preparing an L-shaped section by adopting an extrusion die with an L-shaped die hole, wherein the wall thickness of one side of the L-shaped section is 1.6mm, and the wall thickness of the other side of the L-shaped section is 2.1 mm.
2. The extrusion preparation method of the titanium alloy thin-wall section bar according to claim 1, wherein the cross section of the extrusion die has an L-shaped die hole structure, the number of the die holes is 2, the die holes are symmetrically distributed on two sides of the axis of the extrusion die, and the machining precision of the die holes is +/-0.1 mm.
3. The extrusion preparation method of the titanium alloy thin-wall section bar as claimed in claim 1, wherein the material of the extrusion die is 3Cr2W8V heat-resistant die steel.
4. The extrusion preparation method of the titanium alloy thin-wall section bar as claimed in claim 1, wherein the lubricant is graphite and molybdenum disulfide.
5. The extrusion preparation method of the titanium alloy thin-wall section bar according to claim 1, characterized in that the section bar is straightened by a pressure straightening method.
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| CN111783234B (en) * | 2019-03-18 | 2022-03-22 | 西北工业大学 | Method and system for establishing extrusion process window of as-cast titanium alloy |
| CN111001741A (en) * | 2019-12-01 | 2020-04-14 | 重庆金世利航空材料有限公司 | TA15 titanium alloy T-shaped material extrusion preparation method |
| CN111809080B (en) * | 2020-06-23 | 2022-07-26 | 中国科学院金属研究所 | A kind of preparation method of TC2 alloy thin-walled extrusion profile |
| CN113369324B (en) * | 2021-07-30 | 2022-09-06 | 索罗曼(常州)合金新材料有限公司 | Continuous extrusion method for titanium alloy |
| CN115255018B (en) * | 2022-05-31 | 2025-04-25 | 天津职业技术师范大学(中国职业培训指导教师进修中心) | A hot working method for improving the mechanical properties of titanium alloy fastener bar blanks |
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| CN101722204A (en) * | 2009-12-10 | 2010-06-09 | 胡乐煊 | Extrusion process for titanium alloy profile material |
| CN103331321A (en) * | 2013-06-17 | 2013-10-02 | 中国航空工业集团公司北京航空材料研究院 | Preparation method of titanium alloy profile through extrusion |
| CN104646444A (en) * | 2013-11-22 | 2015-05-27 | 北京有色金属研究总院 | Titanium alloy profile extrusion anti-oxidation and lubrication method |
| CN106694599A (en) * | 2015-07-25 | 2017-05-24 | 机械科学研究总院先进制造技术研究中心 | Extrusion-without-leaving-billet processing method of nonferrous metal section bars |
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