CN112935205A - 7xxx series aluminum alloy large-size hollow ingot production device and process thereof - Google Patents
7xxx series aluminum alloy large-size hollow ingot production device and process thereof Download PDFInfo
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- CN112935205A CN112935205A CN202110314289.4A CN202110314289A CN112935205A CN 112935205 A CN112935205 A CN 112935205A CN 202110314289 A CN202110314289 A CN 202110314289A CN 112935205 A CN112935205 A CN 112935205A
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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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- 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
- B22D11/04—Continuous casting of metals, i.e. casting in indefinite lengths into open-ended moulds
- B22D11/055—Cooling the moulds
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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
- B22D11/16—Controlling or regulating processes or operations
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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
- B22D7/00—Casting ingots, e.g. from ferrous metals
- B22D7/005—Casting ingots, e.g. from ferrous metals from non-ferrous metals
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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
- B22D7/00—Casting ingots, e.g. from ferrous metals
- B22D7/04—Casting hollow ingots
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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
- B22D7/00—Casting ingots, e.g. from ferrous metals
- B22D7/06—Ingot moulds or their manufacture
- B22D7/064—Cooling the ingot moulds
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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- C22C1/00—Making non-ferrous alloys
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- C22C1/026—Alloys based on aluminium
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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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- C22C21/00—Alloys based on aluminium
- C22C21/10—Alloys based on aluminium with zinc as the next major constituent
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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 a production device and a production process of a 7xxx series aluminum alloy large-size hollow ingot casting, wherein the device comprises a crystallizer, a water jacket, a core and a core support, the core support is arranged above the crystallizer through an annular groove arranged at the top of the crystallizer, the core support is a circular frame, a raised connecting port is arranged at the central position of the core support, the connecting port is fixed with the edge of the core support through a reinforcing rib, a connecting sleeve connected with a core water inlet is arranged in the connecting port, the upper part of the connecting sleeve is in threaded fit connection with the connecting port and extends out of the connecting port, a lower port is arranged at the core water inlet, a connecting plate matched with the port of the core is arranged; the 7xxx series aluminum alloy large-size hollow ingot prepared by the processes of smelting, refining, casting by a specific device and bipolar uniform fire treatment is accurately matched by using process parameters to ensure the formability and the structure of the ingot.
Description
Technical Field
The invention belongs to the technical field of vertical semi-continuous casting of aluminum alloy hollow ingots, and particularly relates to a production device and a production process of a 7xxx series aluminum alloy large-size hollow ingot.
Background
Modern civil aircraft continuously develop towards large size, high speed, long service life, high flight safety and low cost, the design target of the large passenger aircraft is to meet the design of 90,000 hours, 30 calendar year life, durability damage tolerance and corrosion prevention, 7xxx high strength pipes and profiles are used as important bearing parts of the large passenger aircraft structure, high requirements are provided for the strength, corrosion resistance, damage tolerance and comprehensive performance of the materials, and the control of ingot casting tissues for extrusion production is the key for ensuring that all pipes and profiles meet the requirements.
The 7xxx series aluminum alloy high-alloy large-specification cast ingot can be obtained by two ways, one way is spray forming production, and the other way is semi-continuous casting production; at present, the injection molding ingot casting passes experimental verification, but the injection molding ingot casting has high cost, long production period, low application maturity and high manufacturing cost; the semi-continuous casting process belongs to a mature casting process, is relatively simple in process flow, high in application maturity, and has an equipment foundation and a technical foundation, so that the production period can be shortened, the ingot casting can be produced autonomously, and the quality controllability is high; on the other hand, the semi-continuous casting and forming technology of high-alloying cast ingots with complex components and high forming difficulty can be broken through, the research and development level of the advanced aluminum alloy material in China is improved, and the requirements of the aviation industry and other fields of national economy on high-strength and high-toughness aluminum materials are met.
The existing semicontinuous casting process has the defects of limited crystallization area, large temperature field change, poor ingot cooling uniformity and the like, so that the formability problems of low controllability, poor formability, easy occurrence of annular cracks, radioactive cracks, open core cracks and the like can be caused.
Disclosure of Invention
The invention aims to provide a production device of a 7xxx series aluminum alloy large-size hollow ingot, and the invention also aims to provide a process for producing the 7xxx series aluminum alloy large-size hollow ingot by using the device, so as to solve the problems of low controllability, poor formability, easy occurrence of ring cracks, radioactive cracks, through cracks and other formability of the 7xxx series aluminum alloy large-size hollow ingot in the prior art.
In order to achieve the purpose, the invention adopts the technical scheme that: a7 xxx series aluminum alloy large-specification hollow ingot production device comprises a crystallizer, a water jacket, a core and a core support, wherein the crystallizer is arranged in the water jacket to form a cooling water cavity with the outer side of the crystallizer, the lower part of the crystallizer is provided with a water outlet, the core is arranged in the crystallizer and forms an annular casting cavity with the inner side of the crystallizer, the upper part of the core is provided with a core water inlet, the lower part of the core is provided with a core water hole, the core support is arranged above the crystallizer through an annular groove arranged at the top of the crystallizer, the core support is a circular frame, a raised connecting port is arranged at the central position of the core support, the connecting port is fixed with the edge of the core support through a reinforcing rib, a connecting sleeve connected with the core water inlet is arranged in the connecting port, the upper part of the connecting sleeve is in threaded fit connection with the connecting port, the connecting plate is provided with a bolt hole.
Furthermore, the delivery port is the equipartition water hole of diameter 3mm, adopts 60 inclination setting.
Further, the core water holes are drilled in a mechanical uniform distribution mode, the diameter of each core water hole is 6mm, and the core water holes are arranged at an inclination angle of 30 degrees.
Further, the crystallizer is in an inverted cone shape, the diameter of the upper edge of the crystallizer is phi 574mm, the diameter of the lower edge of the crystallizer is phi 572mm, and the taper is 1: 20.
Further, the core is conical, the diameter of the upper edge is phi 350mm, the diameter of the lower edge is phi 345mm, and the taper is 1: 14.
Further, the crystallizer and the core are both made of 2A50 forged aluminum alloy.
The other technical scheme provided by the invention is as follows: a process for producing a large-size 7xxx aluminum alloy hollow ingot by using the device comprises the following steps:
step A) aluminum alloy smelting: preparing the 7xxx series waste material with the weight percentage of 50-55 percent, Cu: 2.1-2.6%, Mg 1.9-2.3%, Zn: 7.7% -8.3%, Zr: 0.09% -0.23%, Ti: melting the raw materials with the weight percent less than or equal to 0.05 percent and the balance of Al into liquid by a resistance band heat radiation heating method;
step B) chemical composition adjustment: after the aluminum alloy melt is completely melted and the temperature reaches 730-;
step C), furnace guiding: introducing the aluminum alloy melt with properly adjusted chemical components into a standing furnace for refining;
step D), refining: a K-type couple is inserted into the middle of the melt for measuring the temperature, refining is started when the temperature in the furnace is 740-755 ℃, and meanwhile, the proportion of nitrogen gas is 88-92 percent, and the proportion of chlorine gas is as follows: removing slag inclusion and gas in the solution by using 8-12% of mixed gas, refining for 20-25min, carrying out hydrogen measurement after standing for 15 min, controlling the hydrogen content to be less than 0.1ml/100gAl, standing for 50 min after hydrogen measurement, and slagging to obtain a refined alloy solution;
step E), starting casting: cleaning oil stains and water in a crystallizer (1), paving the bottom, after the edge of the bottom-paved aluminum is solidified by 20-40 mm, injecting 7xxx series aluminum alloy melt, paving a secondary false bottom, simultaneously respectively entering cooling water into a cooling water cavity and a core formed by a water jacket and the outer side of the crystallizer from a water inlet of the crystallizer and a core water inlet of the core to form a structure for simultaneously cooling the inside and the outside of the crystallizer and the core, after the bottom paving is finished, injecting the obtained refined alloy melt into the crystallizer, opening a casting machine switch when the liquid level of the melt rises to a position 30mm away from the outer edge of the crystallizer, casting under the conditions that the casting speed is 25-30mm/min, the casting temperature is 750 ℃ and the casting water pressure is 0.11-0.15MPa, stopping water after the head metal of cast ingot is solidified by one half to two thirds, starting to descend quickly, and stopping when the head of the cast ingot is 0-10mm away from the lower edge of the crystallizer, obtaining a 7xxx series aluminum alloy large-specification hollow cast ingot;
step F) bipolar homogenizing treatment: and G) hoisting the hollow ingot obtained in the step G) into a homogenizing furnace, preserving the heat for 4-6 hours when the temperature of the ingot reaches 300-350 ℃, then raising the temperature again, preserving the heat for 24-30 hours when the temperature reaches 495-505 ℃, cooling along with the furnace after the heat preservation is finished, and discharging the ingot from the furnace when the temperature of the ingot reaches 230-250 ℃.
Further, in the step A), pure metals of Cu, Mg and Zn are adopted, 3% of intermediate alloy is adopted as Zr, and 5% of intermediate alloy is adopted as Ti.
Further, in the step E), the position of the bottom-paving aluminum product is not lower than Al99.85, the temperature is not lower than 732 ℃, and the bottom-paving thickness is 20-25 mm.
Further, the specification of the 7xxx series aluminum alloy large-specification hollow ingot in the step E) is phi 535/360 mm.
The invention has the beneficial effects that:
1. the device has the advantages of reasonable design, simple structure, high matching precision, convenient assembly and disassembly, convenient disassembly and assembly, low labor intensity and high production efficiency, and can be realized by only one person using the shifting wrench;
2. the casting method has the advantages that the process parameters are accurate, the matching is tight, the production cost is low, the popularization and the use are convenient, the casting formability of the cast ingot is ensured through controlling the casting speed, the casting temperature and the casting water pressure, the temperature field distribution is uniform, the consistency of the internal and external cooling rates is ensured, and the generation of casting cracks caused by larger internal stress is prevented;
3. according to the invention, bottom paving is carried out before casting, 99.85% pure aluminum is used for bottom paving, the bottom paving thickness is 20-25mm, and the bottom cracks of the hollow cast ingots can be prevented;
4. the equilibrium structure obtained by the two-stage homogenizing treatment is finer than the as-cast structure, and the strength and hardness of the alloy are improved.
Drawings
FIG. 1 is a schematic structural diagram of a 7xxx series aluminum alloy large-specification hollow ingot production device;
FIG. 2 is a schematic view of the connecting sleeve structure of the present invention;
FIG. 3 is a front view of the cartridge holder of the present invention;
FIG. 4 is a top view of the cartridge holder of the present invention;
FIG. 5 is a schematic view of the core structure of the present invention.
In the figure: 1. a crystallizer; 2. a core; 3. a core support; 4. a connecting port; 5. connecting sleeves; 6. a water jacket; 7. a water outlet; 8. core water holes; 9. a core water inlet; 10. an external thread; 11. an annular groove; 12. reinforcing ribs; 13. a connecting plate; 14. bolt holes; 15. a water inlet.
Detailed Description
The present invention is described in further detail below with reference to the attached drawing figures.
As shown in fig. 1 to 5, a 7xxx series aluminum alloy large-size hollow ingot production device comprises a crystallizer 1, a water jacket 6, a core 2 and a core support 3, wherein the crystallizer 1 is arranged in the water jacket 6 to form a cooling water cavity with the outer side of the crystallizer 1, the lower part of the crystallizer 1 is provided with a water outlet 7, the core 2 is arranged in the crystallizer 1 and forms an annular casting cavity with the inner side of the crystallizer 1, the upper part of the core 2 is provided with a core water inlet 9, the lower part of the core 2 is provided with a core water hole 8, the core support 3 is arranged above the crystallizer 1 through an annular groove 11 arranged at the top of the crystallizer 1, the core support 3 is a circular frame and is provided with a raised connecting port 4 at the central position, the connecting port 4 is fixed with the edge of the core support 3 through a reinforcing rib 12, a connecting sleeve 5 connected with the core water inlet 9 is arranged in the connecting port 4, the upper part, the lower port is arranged at the water inlet 9 of the core, the outer side wall of the lower port is provided with a connecting plate 13 matched with the port of the core 2, and the connecting plate 13 is provided with a bolt hole 14; the crystallizer 1 is in a reverse taper shape, the diameter of the upper edge is phi 574mm, the diameter of the lower edge is phi 572mm, the taper is 1:20, the diameter of the core 2 is in a taper shape, the diameter of the upper edge is phi 350mm, the diameter of the lower edge is phi 345mm, and the taper is 1:14, so that the locking phenomenon in the cooling process can be effectively prevented, and the crystallizer 1 and the core 2 are both made of 2A50 forged aluminum alloy, so that the heat conductivity is better, and the cooling effect is better.
The water outlets 7 are uniformly distributed water holes with the size of 3mm, and the inclination angle of 60 degrees is adopted, so that the flow of water flow is effectively improved, eddy is prevented, and the cooling efficiency is improved; the core water holes 8 are drilled uniformly and mechanically, the diameter of each core water hole is 6mm, and the core water holes are arranged at an inclination angle of 30 degrees, so that cooling water can be sprayed uniformly, and the cooling rate of the crystallizer is better matched.
A process for producing a 7xxx series aluminum alloy large-specification hollow ingot by using the device comprises the following steps:
step A) aluminum alloy smelting: preparing the 7xxx series waste material with the weight percentage of 50-55 percent, Cu: 2.1-2.6%, Mg 1.9-2.3%, Zn: 7.7% -8.3%, Zr: 0.09% -0.23%, Ti: less than or equal to 0.05 percent, melting the raw material with the balance of Al into liquid by a resistance band heat radiation heating method, wherein Cu, Mg and Zn are pure metals, Zr is a 3 percent intermediate alloy, and Ti is a5 percent intermediate alloy;
step B) chemical composition adjustment: after the aluminum alloy melt is completely melted and the temperature reaches 730-;
step C), furnace guiding: introducing the aluminum alloy melt with properly adjusted chemical components into a standing furnace for refining;
step D), refining: a K-type couple is inserted into the middle of the melt for measuring the temperature, refining is started when the temperature in the furnace is 740-755 ℃, and meanwhile, the proportion of nitrogen gas is 88-92 percent, and the proportion of chlorine gas is as follows: removing slag inclusion and gas in the solution by using 8-12% of mixed gas, refining for 20-25min, carrying out hydrogen measurement after standing for 15 min, controlling the hydrogen content to be less than 0.1ml/100gAl, standing for 50 min after hydrogen measurement, and slagging to obtain a refined alloy solution;
step E), starting casting: cleaning oil stains and water in a crystallizer 1, paving a bottom, wherein the position of a bottom paving aluminum product is not lower than Al99.85, the temperature is not lower than 732 ℃, the thickness of the bottom paving is 20-25mm, after the edge of the bottom paving aluminum product is solidified for 20-40 mm, 7xxx series aluminum alloy melt is injected, secondary false bottom paving is carried out, cooling water enters a cooling water cavity and a core 2 formed by a water jacket 6 and the outer side of the crystallizer 1 from a water inlet 15 of the crystallizer 1 and a core water inlet 9 of the core 2 respectively to form a structure for cooling the inner and outer parts of the crystallizer 1 and the core 2 simultaneously, after the bottom paving is finished, an obtained refined alloy solution is injected into the crystallizer 1, when the liquid level of the melt rises to a position 30mm away from the outer edge of the crystallizer 1, a switch is opened to carry out casting under the conditions that the casting speed is 25-30mm/min, the casting temperature is 750-760 ℃, and the casting water pressure is 0.11, and (3) stopping water after the head metal cast by the ingot is solidified by one half to two thirds, starting a quick vehicle to descend, and stopping when the distance between the head cast by the ingot and the lower edge of the crystallizer 1 is still 0-10mm to obtain the 7xxx series aluminum alloy large-specification hollow ingot, wherein the outer diameter of the large-specification hollow ingot is phi 535mm, and the inner diameter of the large-specification hollow ingot is phi 360 mm.
The crystallizer 1 and the core 2 are made of 2A50 forged aluminum alloy which is made of the same material and has better heat conductivity, the crystallizer 1 and the core 2 are cast and formed by a method of cooling the inside and the outside of the crystallizer 1 and the core 2 simultaneously, the uniformity of ingot casting tissues is good, the casting temperature field appearance of the ingot casting is basically consistent, the ingot casting tissues are presented as surface fine isometric crystals which are in contact with the crystallizer 1 and the core 2 and columnar crystals at the wall thickness position of 1/2-1/3, the distribution range of the central fine isometric crystals is narrow due to smaller wall thickness, and the ingot casting device has obvious advantages compared with the ingot casting strength and tissues processed and formed by solid ingot casting.
The invention can shorten the production period, realizes the automatic production of the cast ingot and has high quality controllability; on the other hand, the semi-continuous casting and forming technology of high-alloying cast ingots with complex components and high forming difficulty can be broken through, the research and development level of the advanced aluminum alloy material in China is improved, and the requirements of the aviation industry and other fields of national economy on high-strength and high-toughness aluminum materials are met.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. The utility model provides a 7xxx is hollow ingot production device of aluminium alloy large specification which characterized in that: the crystallizer comprises a crystallizer (1), a water jacket (6), a core (2) and a core support (3), wherein the crystallizer (1) is arranged in the water jacket (6) to form a cooling water cavity with the outer side of the crystallizer (1), a water outlet (7) is formed in the lower part of the crystallizer (1), the core (2) is arranged in the crystallizer (1) and forms an annular casting cavity with the inner side of the crystallizer (1), a core water inlet (9) is formed in the upper part of the core (2), a core water hole (8) is formed in the lower part of the core (2), the core support (3) is arranged above the crystallizer (1) through an annular groove (11) formed in the top of the crystallizer (1), the core support (3) is a circular frame and is provided with a raised connecting port (4) in the central position, the core support (4) is fixed with the edge of the core support (3) through a reinforcing rib (12), a connecting sleeve (5) connected with the core, the upper portion of adapter sleeve (5) is connected and is extended outside connector (4) with connector (4) screw-thread fit, and core water inlet (9) and connecting plate (13) that the lateral wall was equipped with the port looks adaptation with core (2) are arranged in to the lower port, are equipped with bolt hole (14) on connecting plate (13).
2. The production device of the large-size 7xxx aluminum alloy hollow ingot as claimed in claim 1, wherein: the water outlets (7) are uniformly distributed water holes with the diameter of 3mm and are arranged at 60-degree inclination angles.
3. The production device of the large-size 7xxx aluminum alloy hollow ingot as claimed in claim 1, wherein: the core water holes (8) are drilled in a mechanical uniform distribution mode, the diameter of each core water hole is 6mm, and the core water holes are arranged at an inclination angle of 30 degrees.
4. The production device of the large-size 7xxx aluminum alloy hollow ingot as claimed in claim 1, wherein: the crystallizer (1) is in a reverse taper shape, the diameter of the upper edge is phi 574mm, the diameter of the lower edge is phi 572mm, and the taper is 1: 20.
5. The production device of the large-size 7xxx aluminum alloy hollow ingot as claimed in claim 1, wherein: the core (2) is conical, the diameter phi of the upper edge is 350mm, the diameter phi of the lower edge is 345mm, and the conicity is 1: 14.
6. The production device of the large-size 7xxx aluminum alloy hollow ingot as claimed in claim 1, wherein: the crystallizer (1) and the core (2) are both made of 2A50 forged aluminum alloy.
7. A process for producing a large format hollow ingot of a 7xxx series aluminum alloy using the apparatus of any of claims 1 to 6, comprising the steps of:
step A) aluminum alloy smelting: preparing the 7xxx series waste material with the weight percentage of 50-55 percent, Cu: 2.1-2.6%, Mg 1.9-2.3%, Zn: 7.7% -8.3%, Zr: 0.09% -0.23%, Ti: melting the raw materials with the weight percent less than or equal to 0.05 percent and the balance of Al into liquid by a resistance band heat radiation heating method;
step B) chemical composition adjustment: after the aluminum alloy melt is completely melted and the temperature reaches 730-;
step C), furnace guiding: introducing the aluminum alloy melt with properly adjusted chemical components into a standing furnace for refining;
step D), refining: and (3) adopting a K-type couple to be inserted into the middle part of the melt for temperature measurement, starting refining when the temperature in the furnace is 740-755 ℃, and simultaneously introducing nitrogen in the proportion: 88% -92%, chlorine: removing slag inclusion and gas in the solution by using 8-12% of mixed gas, refining for 20-25min, carrying out hydrogen measurement after standing for 15 min, controlling the hydrogen content to be less than 0.1ml/100gAl, standing for 50 min after hydrogen measurement, and slagging to obtain a refined alloy solution;
step E), starting casting: cleaning oil stains and water in a crystallizer (1), paving the bottom, after the edge of bottom-paved aluminum is solidified by 20-40 mm, injecting 7xxx series aluminum alloy melt, paving a secondary false bottom, simultaneously respectively entering cooling water from a water inlet (15) of the crystallizer (1) and a core water inlet (9) of a core (2) into a cooling water cavity and the core (2) formed by a water jacket (6) and the outer side of the crystallizer (1) from a water inlet (15) of the crystallizer (1) to form a structure for simultaneously cooling the inside and the outside of the crystallizer (1) and the core (2), after the bottom paving is finished, injecting the obtained refined alloy melt into the crystallizer (1), opening a casting machine switch when the liquid level of the melt rises to a position 30mm away from the outer edge of the crystallizer (1), casting under the conditions of casting speed of 25-30mm/min, casting temperature of 750-, and starting the rapid car to descend, and stopping when the distance between the cast head of the ingot and the lower edge of the crystallizer (1) is still 0-10mm to obtain a 7xxx series aluminum alloy large-specification hollow ingot;
step F) bipolar homogenizing treatment: and G) hoisting the hollow ingot obtained in the step G) into a homogenizing furnace, preserving the heat for 4-6 hours when the temperature of the ingot reaches 300-350 ℃, then raising the temperature again, preserving the heat for 24-30 hours when the temperature reaches 495-505 ℃, cooling along with the furnace after the heat preservation is finished, and discharging the ingot from the furnace when the temperature of the ingot reaches 230-250 ℃.
8. The production process of the large-size hollow ingot of the 7xxx aluminum alloy as set forth in claim 7, wherein in the step A), pure metals of Cu, Mg and Zn are adopted, a 3% intermediate alloy of Zr is adopted, and a 5% intermediate alloy of Ti is adopted.
9. The production process of the 7xxx series aluminum alloy large-size hollow ingot as claimed in claim 7, wherein in the step E), the bedding aluminum grade is not lower than Al99.85, the temperature is not lower than 732 ℃, and the bedding thickness is 20-25 mm.
10. The process for producing the large-size 7xxx aluminum alloy hollow ingot according to claim 7, wherein the specification of the large-size 7xxx aluminum alloy hollow ingot in the step E) is phi 535/360 mm.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114393180A (en) * | 2021-12-24 | 2022-04-26 | 西南铝业（集团）有限责任公司 | Preparation method of 7021 aluminum alloy oversized ingot |
| CN114410996A (en) * | 2022-01-25 | 2022-04-29 | 西北铝业有限责任公司 | Large-size aluminum alloy semicircular tube machining process |
| CN114393180B (en) * | 2021-12-24 | 2024-05-10 | 西南铝业（集团）有限责任公司 | Preparation method of 7021 aluminum alloy oversized ingot |
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2021
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114393180A (en) * | 2021-12-24 | 2022-04-26 | 西南铝业（集团）有限责任公司 | Preparation method of 7021 aluminum alloy oversized ingot |
| CN114393180B (en) * | 2021-12-24 | 2024-05-10 | 西南铝业（集团）有限责任公司 | Preparation method of 7021 aluminum alloy oversized ingot |
| CN114410996A (en) * | 2022-01-25 | 2022-04-29 | 西北铝业有限责任公司 | Large-size aluminum alloy semicircular tube machining process |
| CN114410996B (en) * | 2022-01-25 | 2023-02-17 | 西北铝业有限责任公司 | Large-size aluminum alloy semicircular tube machining process |
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