CN108890218B - Manufacturing process of high-strength heat-resistant aluminum alloy forging - Google Patents
Manufacturing process of high-strength heat-resistant aluminum alloy forging Download PDFInfo
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- CN108890218B CN108890218B CN201810470267.5A CN201810470267A CN108890218B CN 108890218 B CN108890218 B CN 108890218B CN 201810470267 A CN201810470267 A CN 201810470267A CN 108890218 B CN108890218 B CN 108890218B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
- B23P15/00—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21H—MAKING PARTICULAR METAL OBJECTS BY ROLLING, e.g. SCREWS, WHEELS, RINGS, BARRELS, BALLS
- B21H1/00—Making articles shaped as bodies of revolution
- B21H1/06—Making articles shaped as bodies of revolution rings of restricted axial length
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21J—FORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
- B21J5/00—Methods for forging, hammering, or pressing; Special equipment or accessories therefor
- B21J5/002—Hybrid process, e.g. forging following casting
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Abstract
The invention discloses a manufacturing process of a high-strength heat-resistant aluminum alloy forging, which comprises the following steps: the method comprises the following steps of material preparation, heating, multi-shaft forging, machining, heating, saddle reaming, heating, ring rolling, machining, annealing, solution quenching, cold pressing deformation, aging and the like, wherein the ring rolling process comprises three temperature sections: in the first temperature section, the deformation temperature is 420-; in the second temperature section, the deformation temperature is 300-340 ℃, the core roller feeding speed is 0.1-0.3mm/s, and the deformation amount is 10 percent; the third temperature stage, the deformation temperature is 200 ℃ and 240 ℃, the feeding speed of the core roller is 0.05-0.2mm/s, and the deformation is 10%.
Description
Technical Field
The invention relates to a forming and heat treatment process of an aluminum alloy ring piece, in particular to a manufacturing process suitable for a 2219 high-strength heat-resistant aluminum alloy ring forging.
Background
The 2000 series high-strength high-toughness aluminum alloy has the characteristics of small density, high specific strength, good heat resistance, corrosion resistance, good processing performance, easy recovery, heat treatment reinforcement and the like, and is a preferred material for lightening airplanes and spacecrafts. In recent years, the demand of the development of aerospace technology on aluminum alloy ring forging rings is increased greatly, and higher requirements on the consistency and stability of the product structure performance are provided. In production, after 2219 aluminum alloy forging is formed and subjected to heat treatment, the mechanical property is unstable, particularly, the radial and axial elongations are low, and the technical requirements cannot be met, so that the product is scrapped, the machining waste is caused, and other large economic losses are caused. 2219 aluminium alloy ring forging is mainly used as the connecting piece of aviation, space flight and guided missile, bears higher temperature and larger dynamic load during operation, requires the ring forging to have higher strong plasticity in the three directions of cutting, axis and diameter, so the shaping difficulty is increased. At present, the domestic 2219 aluminum alloy ring forging manufacturing process comprises the steps of carrying out homogenizing annealing on aluminum alloy, carrying out free forging, punching, hole expanding and ring rolling after reheating, and then carrying out T852 heat treatment, wherein although the strength is effectively improved, the condition that the radial elongation is low to cause product disqualification is easy to occur; in addition, multiple times of return heating are needed in the forming process, so that great energy consumption is caused. Therefore, the problems in the aspects of forming process and heat treatment process are urgently needed to be solved so as to meet the use requirements of the aerospace field.
Disclosure of Invention
The invention aims at the defects in the prior art, researches and improves, provides a manufacturing process of a high-strength heat-resistant 2219 aluminum alloy forging with a reasonable structure, effectively reduces the anisotropy of the structural property of the aluminum alloy ring forging, and improves the comprehensive mechanical property and the heat resistance of the product.
In order to achieve the purpose, the invention discloses a manufacturing process of a high-strength heat-resistant aluminum alloy forging, which adopts a process scheme comprising the following steps:
(1) preparing materials: sawing the H112 state aluminum alloy round bar material according to the process requirements to obtain a raw material;
(2) heating: charging the raw materials obtained in the step (1) at room temperature, heating to 530 +/-5 ℃, and keeping the temperature for 4 hours; then cooling to 490 plus or minus 5 ℃ and preserving heat for 2 hours to obtain a soaking raw material;
(3) multi-shaft forging: forging the soaking raw material obtained in the step (2), wherein the initial forging temperature is 460-: firstly upsetting for 1 time in the Z direction, upsetting for 1 time in the X direction, upsetting for 1 time in the Y direction, chamfering, rounding, upsetting, flattening the end face, and finally punching to obtain a punched blank;
(4) machining and heating: air-cooling the punched blank obtained in the step (3) to room temperature, cleaning the defects on the inner surface and the outer surface of the ring blank by using a horizontal lathe, charging the ring blank at room temperature, heating to 470 +/-5 ℃, and then preserving heat for 2-4 hours to obtain a ring blank;
(5) reaming and heating the trestle: reaming the ring blank obtained in the step (4) to a process size by using a core rod preheated to 400 +/-5 ℃, re-melting and heating the ring blank subjected to reaming to 450 +/-5 ℃, and then preserving heat for 2-4h to obtain a melted ring blank;
(6) ring rolling: utilizing a 5-meter radial and axial numerical control ring rolling machine to roll the ring-returning ring blank obtained in the step (5) to the process size at the temperature of 200-450 ℃ at the core roller feeding speed of 0.05-0.5 mm/s, thereby obtaining a rolled ring piece;
(7) machining and solution quenching: transferring the ring rolled in the step (6) to the ground to be flat placed, machining the upper end face and the lower end face after complete cooling, charging the machined ring into a furnace at room temperature, heating to 450 +/-3 ℃, keeping the temperature for 30min, then continuously heating to 535 +/-3 ℃ at a heating rate of 50 ℃/h, carrying out solid solution heat preservation for 3h, carrying out quenching at the water temperature of 50-60 ℃, carrying out quenching for 15-20min, and carrying out quenching transfer time of less than or equal to 10s to obtain a ring forging after solid solution quenching;
(8) cold pressing deformation: carrying out 6-7% axial cold deformation on the ring forging subjected to solution quenching obtained in the step (7) to obtain a cold-pressed ring forging;
(9) aging: preserving the heat of the cold-pressed ring forging obtained in the step (8) at the temperature of 170 +/-2 ℃ for 10-15h, and carrying out aging treatment;
preferably, the time for cooling from 530 + -5 deg.C to 490 + -5 deg.C in step (2) of the present invention is 2 hours.
Preferably, the deformation of each upsetting and drawing in the multi-shaft forging process in the step (3) is 60-65%, and the pressing speed is 25-35 mm/s.
Preferably, in the step (5) of the present invention, the deformation amount of the saddle hole expansion is 25% -30% of the total deformation amount from the punched ring blank to the ring forging.
Preferably, the ring rolling process in the step (6) of the invention is performed in three temperature sections: in the first temperature section, the deformation temperature is 420-; in the second temperature section, the deformation temperature is 300-340 ℃, the core roller feeding speed is 0.1-0.3mm/s, and the deformation amount is 10 percent; the third temperature stage, the deformation temperature is 200 ℃ and 240 ℃, the feeding speed of the core roller is 0.05-0.2mm/s, and the deformation is 10%.
Preferably, the lap joint rate of every two cold pressing positions in the step (8) of cold pressing deformation of the invention is more than or equal to 50 percent.
Preferably, when the steps (3), (5) and (6) are deformed, the surfaces of the aluminum alloy ring blank and the die are uniformly coated with the nano lubricant with high absorption rate and lubricating effect;
the preferred aluminum alloy forging of the invention is 2219 aluminum alloy forging.
The invention has the beneficial effects that: the invention effectively dissolves and crushes intragranular and grain boundary residual phases through an optimized multi-stage soaking treatment technology, a multi-shaft forging cogging technology, a saddle reaming technology, a temperature-section ring rolling technology and a cold deformation technology, regulates and controls intragranular and grain boundary precipitated phases, and improves the comprehensive mechanical property and heat resistance of the aluminum alloy ring forging; the subsequent solution treatment promotes the second phase in the structure to realize better dissolution, the deformed structure is recrystallized, and the directionality of the fiber structure of the forge piece is effectively improved; finally, the size and the dispersity of the intragranular and grain boundary precipitated phases are regulated and controlled through large cold pressing deformation and aging treatment, so that the comprehensive mechanical properties of the alloy in all directions reach the standard and are relatively close to each other, and the heat resistance of the alloy is also favorably improved.
Drawings
FIG. 1: is a schematic diagram of the ring rolling process by temperature sections.
FIG. 2: is a schematic view of the heat treatment process of the present invention.
FIG. 3: the microstructure of the aluminum alloy ring forging subjected to heat treatment in the three directions of cutting, diameter and axis is shown, wherein (a) is tangential; (b) is axial; (c) is radial.
Detailed Description
Embodiments of the present invention will be described in detail below with reference to the accompanying drawings.
Example 1: the manufacturing process of the high-strength heat-resistant 2219 aluminum alloy forging comprises the following steps:
(1) preparing materials: sawing 590 +/-5 mm of 2219 aluminum alloy extruded round bar stock of H112 state (hot working state) phi 300 according to the weight of the process requirement, marking the end face of the blank by using a marking pen before forging to distinguish three directions during forging to obtain a raw material;
(2) heating: charging the raw materials obtained in the step (1) at room temperature, heating to 530 +/-5 ℃ according to power (less than or equal to 150 ℃/h), preserving heat for 4h, then cooling to 490 +/-5 ℃ for 2h, preserving heat for 2h, heating before forging, and ensuring the uniformity of furnace temperature to obtain soaking raw materials;
(3) multi-shaft forging: forging the soaking raw material obtained in the step (2), keeping the initial forging temperature at 460-490 ℃, keeping the final forging temperature at more than or equal to 420 ℃, and performing three-heading two-drawing multi-shaft forging cogging on a 3600T hydraulic press, wherein the forging process is as follows: firstly, upsetting axially (Z direction) to 230 +/-3 mm, then drawing out the X direction to 590 +/-3 mm, upsetting the X direction to 230 +/-3 mm, drawing out the Y direction to 590 +/-3 mm, upsetting the Y direction to 230 +/-3 mm, chamfering, rounding, upsetting the Z direction to 200 +/-3 mm, finally punching by using a phi 200 punch preheated to 350 +/-5 ℃, flattening the upper end surface and the lower end surface to 200 +/-3 mm, and keeping the pressing-down speed of an upper cutting board to be about 30mm/s in the multi-shaft forging process to obtain a punched blank;
(4) machining and heating: air-cooling the punched blank obtained in the step (3) to room temperature, cleaning the defects of oxide skin, delamination, folding, cracks and the like on the inner surface, the outer surface, the upper end face and the lower end face of the ring blank by using a horizontal lathe and the like, charging the ring blank at room temperature, heating to 470 +/-5 ℃, and then preserving heat for 2.5 hours to obtain a ring blank;
(5) reaming and heating the trestle: reaming the ring blank obtained in the step (4) to the wall thickness of 130 +/-5 mm by using a phi 200mm core rod preheated to 400 +/-5 ℃, wherein the reaming deformation of the trestle is 26% of the total deformation from the ring blank to the ring forging after punching, returning and heating the ring blank after reaming to 450 +/-5 ℃ again, and preserving heat for 2.5h to obtain a returned ring blank; when the trestle is reamed, the radial deformation of the ring piece during the trestle reaming is improved as much as possible, and the radial deformation during ring rolling is reduced, so that the anisotropy of the alloy structure performance is reduced;
(6) ring rolling: utilizing a 5-meter radial and axial numerical control ring rolling machine to roll the ring-returning ring blank obtained in the step (5) to the process size at the temperature of 200-450 ℃ at the core roller feeding speed of 0.05-0.5 mm/s, thereby obtaining a rolled ring piece; the method comprises the following steps of specifically rolling in a temperature section: in the first temperature stage, the ring blank is taken out of the furnace and then quickly transferred to a ring rolling machine, and is rolled and formed with the deformation of 20 to 25 percent within the temperature range of 420-450 ℃, and the feeding speed of a core roller at the stage is 0.2 to 0.5 mm/s; in the second temperature section, when the surface of the ring blank is cooled to 320 +/-5 ℃, rolling forming with the deformation of 10 percent is carried out, and the feeding speed of the core roller at the stage is 0.1-0.3 mm/s; in the third temperature section, when the surface of the ring blank is cooled to 220 +/-5 ℃, rolling forming with the deformation of 10 percent is carried out, the core roller feeding speed in the third temperature section is 0.05-0.2mm/s, and the thermal state size after rolling is phi 950 +/-5 mm/phi 775 +/-5 mm multiplied by 175 +/-5 mm;
(7) machining and solution quenching: transferring the ring rolled in the step (6) to the ground to be flat, and machining the upper end face and the lower end face to 170 +/-1 mm after the ring is completely cooled; charging the machined ring piece at room temperature, heating to 450 +/-3 ℃, preserving heat for 30min, continuously heating to 535 +/-3 ℃ at the heating rate of 50 ℃/h, carrying out solid solution and heat preservation for 3h, transferring to a water tank with the quenching water temperature of 55 +/-2 ℃ within 10s after solid solution, carrying out quenching for 15min, starting the maximum power of a water circulation system in the quenching process, and continuously swinging the ring forging piece up and down and left and right on the premise that the ring forging piece is completely immersed to ensure the quenching and cooling effect to obtain the ring forging piece after solid solution quenching;
(8) cold pressing deformation: carrying out axial cold deformation of about 6.4% on the ring forging after solution quenching obtained in the step (7), wherein the lap joint rate of the pressing position of the chopping board every two times is more than or equal to 50%, and obtaining the ring forging after cold pressing;
(9) aging: and (4) preserving the heat of the cold-pressed ring forging obtained in the step (8) for 12 hours at the temperature of 170 +/-2 ℃ for aging treatment.
In the forming process of the process, all used dies (including an upper cutting board, a lower cutting board, a punch, a reaming core rod, a roller and the like) need to be preheated, and the surfaces of the aluminum alloy ring blank and the dies are uniformly coated with a nano lubricant with high absorption rate and lubricating effect.
As shown in FIG. 3, the microstructure of the aluminum alloy ring forging subjected to heat treatment in three directions of tangential direction, axial direction and radial direction can be observed, and the microstructure of the aluminum alloy ring forging in all directions reaches the standard, and the crystal grains are uniform and relatively close to each other. Meanwhile, mechanical property tests are carried out on the aluminum alloy ring forging after heat treatment in three directions, and the results are shown in the following table 1:
TABLE 1 mechanical Properties of Ring forgings after Heat treatment
The experimental data show that the tensile strength of the aluminum alloy ring forging obtained by the manufacturing process reaches more than 390MPa, the yield strength reaches more than 290MPa, the hardness reaches more than 120HB, the elongation is more than 4.5%, the aluminum alloy ring forging also has good mechanical properties at a high temperature of 250 ℃, and all properties in three directions can meet the requirements of the aerospace field.
The above description is intended to be illustrative and not restrictive, and the scope of the invention is defined by the appended claims, which may be modified in any manner within the scope of the invention.
Claims (5)
1. The manufacturing process of the high-strength heat-resistant aluminum alloy forging is characterized by comprising the following steps of:
(1) preparing materials: sawing the H112 state aluminum alloy round bar material according to the process requirements to obtain a raw material;
(2) heating: charging the raw materials obtained in the step (1) at room temperature, heating to 530 +/-5 ℃, and keeping the temperature for 4 hours; then cooling to 490 plus or minus 5 ℃ and preserving heat for 2 hours to obtain a soaking raw material;
(3) multi-shaft forging: forging the soaking raw material obtained in the step (2), wherein the initial forging temperature is 460-: firstly upsetting for 1 time in the Z direction, upsetting for 1 time in the X direction, upsetting for 1 time in the Y direction, chamfering, rounding, upsetting, flattening the end face, and finally punching to obtain a punched blank; the deformation of each upsetting-drawing in the multi-shaft forging process in the step (3) is 60-65%, and the pressing speed is 25-35 mm/s;
(4) machining and heating: air-cooling the punched blank obtained in the step (3) to room temperature, cleaning the defects on the inner surface and the outer surface of the ring blank by using a horizontal lathe, charging the ring blank at room temperature, heating to 470 +/-5 ℃, and then preserving heat for 2-4 hours to obtain a ring blank;
(5) reaming and heating the trestle: reaming the ring blank obtained in the step (4) to a process size by using a core rod preheated to 400 +/-5 ℃, re-melting and heating the ring blank subjected to reaming to 450 +/-5 ℃, and then preserving heat for 2-4 hours to obtain a melted ring blank; the deformation of the trestle reaming in the step (5) is 25-30% of the total deformation from the punched ring blank to the ring forging;
(6) ring rolling: utilizing a 5-meter radial and axial numerical control ring rolling machine to roll the ring-returning ring blank obtained in the step (5) to the process size at the temperature of 200-450 ℃ at the core roller feeding speed of 0.05-0.5 mm/s, thereby obtaining a rolled ring piece; the ring rolling process is divided into three temperature sections for rolling: in the first temperature section, the deformation temperature is 420-; in the second temperature section, the deformation temperature is 300-340 ℃, the core roller feeding speed is 0.1-0.3mm/s, and the deformation amount is 10 percent; in the third temperature stage, the deformation temperature is 200 ℃ and 240 ℃, the core roller feeding speed is 0.05-0.2mm/s, and the deformation amount is 10 percent;
(7) machining and solution quenching: transferring the ring rolled in the step (6) to the ground to be flat placed, machining the upper end face and the lower end face after complete cooling, charging the machined ring into a furnace at room temperature, heating to 450 +/-3 ℃, keeping the temperature for 30min, then continuously heating to 535 +/-3 ℃ at a heating rate of 50 ℃/h, carrying out solid solution heat preservation for 3h, carrying out quenching at the water temperature of 50-60 ℃, carrying out quenching for 15-20min, and carrying out quenching transfer time of less than or equal to 10s to obtain a ring forging after solid solution quenching;
(8) cold pressing deformation: carrying out 6-7% axial cold deformation on the ring forging subjected to solution quenching obtained in the step (7) to obtain a cold-pressed ring forging;
(9) aging: and (4) preserving the heat of the cold-pressed ring forging obtained in the step (8) for 10-15h at the temperature of 170 +/-2 ℃ for aging treatment.
2. The manufacturing process of the high-strength heat-resistant aluminum alloy forging piece as claimed in claim 1, wherein the time for cooling from 530 +/-5 ℃ to 490 +/-5 ℃ in the step (2) is 2 hours.
3. The manufacturing process of the high-strength heat-resistant aluminum alloy forging according to claim 1, wherein the lap joint rate of the cold pressing position of every two times in the cold pressing deformation in the step (8) is more than or equal to 50%.
4. The manufacturing process of the high-strength heat-resistant aluminum alloy forging piece according to claim 1, wherein nano-lubricant is uniformly coated on the surfaces of the aluminum alloy ring blank and the die during deformation in the steps (3), (5) and (6).
5. The manufacturing process of the high-strength heat-resistant aluminum alloy forging according to any one of claims 1 to 4, wherein the aluminum alloy forging is a 2219 aluminum alloy forging.
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| CN109338257A (en) * | 2018-12-20 | 2019-02-15 | 西南铝业（集团）有限责任公司 | A kind of method of aluminum alloy forge piece and the uniformity for improving aluminum alloy forge piece |
| CN109622873B (en) * | 2018-12-27 | 2020-11-13 | 天津航天长征技术装备有限公司 | Manufacturing process of fine crystals of 2219 aluminum alloy ring piece |
| CN110026525A (en) * | 2019-04-30 | 2019-07-19 | 襄阳润欣圆锻造有限公司 | A kind of three generations's hub bearing inner ring forging method |
| CN110144533B (en) * | 2019-05-22 | 2020-02-04 | 中南大学 | Method for regulating large second phase of 2219 aluminum alloy ring piece |
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| CN114226614B (en) * | 2021-12-31 | 2024-04-19 | 无锡派克新材料科技股份有限公司 | Deformation control method for difficult-deformation high-elongation aluminum alloy |
| CN114799031B (en) * | 2022-04-20 | 2023-05-26 | 无锡神意环件法兰有限公司 | Production process and application of forging for tire mold |
| CN116967724B (en) * | 2023-09-25 | 2023-12-05 | 陕西长羽航空装备股份有限公司 | Forming method of large-diameter high-cylinder thin-wall forging for manufacturing aeroplane parts |
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| US3333989A (en) * | 1965-02-05 | 1967-08-01 | Aluminum Co Of America | Aluminum base alloy plate |
| FR2529578B1 (en) * | 1982-07-02 | 1986-04-11 | Cegedur | METHOD FOR IMPROVING BOTH FATIGUE RESISTANCE AND TENACITY OF HIGH RESISTANCE AL ALLOYS |
| FR2820438B1 (en) * | 2001-02-07 | 2003-03-07 | Pechiney Rhenalu | PROCESS FOR THE MANUFACTURE OF A CORROSIVE PRODUCT WITH HIGH RESISTANCE IN ALZNMAGCU ALLOY |
| CN101537466B (en) * | 2009-04-30 | 2010-10-13 | 西南铝业（集团）有限责任公司 | Method for manufacturing aluminium alloy rings with high performance and low residual stress |
| CN104759850B (en) * | 2015-04-03 | 2017-01-04 | 无锡派克新材料科技股份有限公司 | A kind of aluminium alloy height barrier part processing technique |
| CN106541060B (en) * | 2015-09-22 | 2018-07-27 | 首都航天机械公司 | A kind of rolling production method of super-large diameter aluminium alloy integral loop |
| CN106270270B (en) * | 2016-08-31 | 2018-02-13 | 无锡派克新材料科技股份有限公司 | A kind of cold compaction process of L-shaped aluminum alloy ring forging |
| CN106498318B (en) * | 2016-10-13 | 2018-04-03 | 中南大学 | Improve the process of 2219 aluminium alloy rings comprehensive mechanical properties |
| CN106623704A (en) * | 2016-12-01 | 2017-05-10 | 贵州安大航空锻造有限责任公司 | Manufacturing method of low stress 2A70 aluminum alloy ring piece |
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