New energy automobile battery box 6 is aluminum alloy and preparation method thereof

Abstract

The present application relates to the field of aluminum profile production, and particularly relates to a new energy automobile battery box 6 system aluminum alloy, a cross section of which has a base as a main body and an extension part extending outward from the base, the base comprises the following components with the mass percentage content: Si 1.35-1.45%, Fe 0.21%, Cu 0.05%, Mn 0.44-0.48%, Mg 0.50-0.55%, Zn 0.05%, Ti 0.02%, impurities total ≤0.15%, and the balance of Al; the extension part comprises the following components with the mass percentage content: Si 1.05-1.5%, Fe ≤0.5%, Cu ≤0.5%, Mn 0.44-0.48%, Mg 0.80-1.55%, Zn ≤0.08%, Ti 0.06-0.08%, Ga or Cr 0.3-0.5%, impurities total ≤0.15%, and the balance of Al; the present application solves the problem that the chemical properties of the existing aluminum alloy cannot be further improved.

Description

Technical Field

[0001] This invention relates to the field of aluminum profile production, specifically to a 6-series aluminum alloy for new energy vehicle battery boxes and its preparation method. Background Technology

[0002] Aluminum alloys are metallic substances made primarily of aluminum, with appropriate amounts of other elements added to achieve different physical and chemical properties. This improves the inherent properties of aluminum to meet various industrial and everyday needs. Currently, the aluminum alloys used in new energy vehicle battery boxes are mostly 6-series aluminum alloys. While these alloys inherently possess high strength, adding different metallic elements to improve chemical properties such as corrosion resistance reduces their original strength, tensile strength, and toughness, making it impossible to simultaneously improve both chemical properties and overall performance. Summary of the Invention

[0003] Therefore, the present invention provides a 6-series aluminum alloy for new energy vehicle battery housing and its preparation method, which solves the problem that the chemical properties of existing aluminum alloys cannot be further improved.

[0004] To achieve the above objectives, the present invention is implemented through the following technical solution:

[0005] A 6-series aluminum alloy is used for the battery box of a new energy vehicle. Its cross-section has a base as the main body and an extension extending outward from the base. The base includes the following components by mass percentage: Si 1.35-1.45%, Fe 0.21%, Cu 0.05%, Mn 0.44-0.48%, Mg 0.50-0.55%, Zn 0.05%, Ti 0.02%, total impurities ≤0.15%, and the balance Al.

[0006] Preferably, the extension is a functional support extending from the base in all directions.

[0007] Preferably, the extension comprises the following components by mass percentage: Si 1.05-1.5%, Fe ≤0.5%, Cu ≤0.5%, Mn 0.44-0.48%, Mg 0.80-1.55%, Zn ≤0.08%, Ti 0.06-0.08%, Ga or Cr 0.3-0.5%, total impurities ≤0.15%, and the balance Al.

[0008] Preferably, the extension is a surface layer covering one side surface of the base.

[0009] A method for preparing a 6-series aluminum alloy battery box for new energy vehicles, wherein the base is a square structure with a hole in the center, the extension is a functional support extending from the base to all sides, the center of the hole is taken as the base point, the distance from the base point to the side wall of the hole is L1, the overall wall thickness of the aluminum profile is L2, and the forming process includes the following steps:

[0010] a. Casting ingots: The ingots include a hollow main ingot and support ingots attached to the outer surface of the ingot. The number of support ingots is the same as the number of support feet and they are distributed in the same position. The wall thickness of the main ingot is controlled between (L1-L2) / 10 and (L1+L2) / 5. The cross-section of the main ingot is circular or near-circular.

[0011] b. Place the ingot into the extrusion die and extrude it through the extruder to obtain an aluminum alloy profile blank. The cross-section of the blank is the cross-sectional shape of the base and the support.

[0012] The extrusion die includes a die pad, an upper die, and a die sleeve for fixing. A cooling system is provided on the outside of the die sleeve. The die pad has a pad hole in the center, and the upper die has an extrusion hole in the center corresponding to the pad hole. The extrusion hole has a core that fits and passes through the pad hole. The output end of the core and the extrusion hole is the working part for forming aluminum profiles. The upper die at the rear end of the working part is a hollow part for maintaining the size stability of the aluminum profile. The inner wall of the core and the extrusion hole is the pre-forming area of ​​the ingot. The radial dimension of the core located in the pre-forming area gradually decreases from the pad hole side to the working part side, and the radial dimension of the extrusion hole at the corresponding position is set accordingly.

[0013] c. The extruded aluminum alloy profiles are subjected to online water mist quenching treatment at the extrusion die exit;

[0014] d. The quenched aluminum alloy profile is stretched and straightened, and then artificially aged to obtain the aluminum profile.

[0015] Preferably, the cooling system includes a first cooling component for cooling the aluminum profile at the output end of the working part and a second cooling component for cooling the extrusion die. The first cooling component acts on the empty blade part, and the second cooling system acts between the upper die and the die pad.

[0016] Preferably, the periphery of the hollow blade portion is provided with a cooling channel for the entry of liquid nitrogen from the first cooling assembly.

[0017] Preferably, the thickness of the preformed area is constant.

[0018] A method for preparing a 6-series aluminum alloy battery box for new energy vehicles, wherein the base is a flat plate structure and the extension is a surface layer covering one side of the base, and the forming process includes the following steps:

[0019] a. Casting ingot: The ingot includes a main ingot located at the upper end as base material and a support ingot located at the lower end as extension material, the support ingot covering at least 1 / 2 of the surface of the main ingot;

[0020] b. Place the ingot into the extrusion die and extrude it through the extruder to obtain aluminum alloy profile blank. The cross-section of the blank is the cross-sectional shape of the base and the surface.

[0021] The extrusion die includes a die pad, an upper die, and a die sleeve for fixing. A cooling system is provided on the outside of the die sleeve. The die pad has a pad hole in the center, and the upper die has an extrusion hole in the center corresponding to the pad hole. The extrusion hole has a working part for forming, a hollow part located at the rear end of the working part, and a preforming area located at the front end of the working part. The radial dimension of the preforming area gradually decreases from the pad hole side to the working part side.

[0022] c. The extruded aluminum alloy profiles are subjected to online water mist quenching treatment at the extrusion die exit;

[0023] d. The quenched aluminum alloy profile is stretched and straightened, and then artificially aged to obtain the aluminum profile.

[0024] By adopting the aforementioned technical solution, the beneficial effects of the present invention are:

[0025] Based on the different parts and structures of the product, this technical solution designs product structures with different mass ratios. The base, which is the main component, uses high-strength aluminum alloy developed in the direction of high strength, while the extension can be selected with different mass ratios of aluminum alloy to meet different product usage requirements. For example, elements such as Ga or Cr can be added to improve its corrosion resistance, thereby improving the performance on the basis of raw materials and further improving the responsive chemical properties on the basis of traditional electrostatic spraying.

[0026] During the production process, depending on the application location, a single ingot can be selected. The ingot is designed according to the cross-sectional shape of the aluminum profile. During the ingot forming process, the aluminum profile is pre-treated according to its cross-section to create a hollow structure and limit its thickness. The thickness is determined by the central hole of the aluminum profile and the material required for the corresponding side supports. In the extrusion forming process, compared to traditional solid ingots, this reduces changes in the internal fine-grain structure during extrusion, ensuring a uniform state and thus ensuring a relatively uniform distribution of hardness in the aluminum profile. At this point, the influence of the mold's forming structure on the grain size is greatly reduced. The main control methods can then focus on adjusting the profile's undercooling and modification treatment. This approach forms a relatively stable control system for the formed grain size of the aluminum profile, thereby improving the consistency of the produced aluminum profile quality.

[0027] Alternatively, a casting structure with dual material ratios can be used, with aluminum alloys of high chemical properties such as corrosion resistance coated onto the base with high strength, forming a surface structure with different characteristics. This surface structure can be applied to the outer surface of the battery box of new energy vehicles, and combined with electrostatic spraying of the transmission to further improve the corrosion resistance of the battery box surface.

[0028] This production method has a wide range of applications. It can use profiles with different proportions to be extruded in one go according to different needs, and it can be applied to a variety of related or similar fields. It is versatile and practical. Attached Figure Description

[0029] Figure 1 This is a schematic diagram of the cross-section of the aluminum profile in Embodiment 1 of the present invention;

[0030] Figure 2 This is a schematic diagram of the cross-sectional structure of the ingot in Embodiment 1 of the present invention;

[0031] Figure 3 This is a schematic cross-sectional view of the extrusion die in Embodiment 1 of the present invention;

[0032] Figure 4 This is a schematic diagram of the cooling channel structure in Embodiment 1 of the present invention;

[0033] Figure 5 This is a schematic diagram of the cross-sectional structure of the ingot in Embodiment 2 of the present invention;

[0034] Figure 6 This is a cross-sectional structural diagram of the extrusion die in Embodiment 2 of the present invention.

[0035] Reference numerals: 100, hole; 100a, base; 101, extension; 101a, support; 101b, surface layer; 200, ingot; 201, support; 1, mold pad; 11, pad hole; 2, upper mold; 21, extrusion hole; 211, working part; 212, preforming area; 213, empty blade part; 22, core part; 3, mold sleeve; 4a, first cooling assembly; 4b, second cooling assembly; 41, nozzle; 42, hose; 43, liquid nitrogen cylinder; 44, cooling channel; 441, liquid inlet channel; 442, annular groove; 443, liquid outlet channel. Detailed Implementation

[0036] The following will describe in detail the implementation of the present invention with reference to specific embodiments, so that the process of how the present invention uses technical means to solve technical problems and achieve technical effects can be fully understood and implemented accordingly. Example 1

[0037] refer to Figure 1 , Figure 2 and Figure 3A 6-series aluminum alloy battery box for new energy vehicles has a cross-section comprising a base 100a as the main body and an extension 101 extending outward from the base 100a. The base 100a comprises the following components by mass percentage: Si 1.35-1.45%, Fe 0.21%, Cu 0.05%, Mn 0.44-0.48%, Mg 0.50-0.55%, Zn 0.05%, Ti 0.02%, with total impurities ≤0.15% and the balance being Al.

[0038] Structurally, the extension 101 is a functional support 101a extending outward from the base 100a. The extension 101 has a different composition from the base 100a and includes the following components by mass percentage: Si 1.05-1.5%, Fe ≤0.5%, Cu ≤0.5%, Mn 0.44-0.48%, Mg 0.80-1.55%, Zn ≤0.08%, Ti 0.06-0.08%, Ga or Cr 0.3-0.5%, total impurities ≤0.15%, and the balance Al.

[0039] A method for preparing a 6-series aluminum alloy battery box for new energy vehicles, wherein the base 100a is a square structure with a central hole 100, the extension 101 is a functional support 101a extending outward from the base 100a, the center of the hole 100 is taken as the base point, the distance from the base point to the side wall of the hole 100 is L1, and the overall wall thickness of the aluminum profile is L2, characterized in that the forming of the aluminum profile includes the following steps:

[0040] a. Casting ingot 200, wherein the ingot 200 is a hollow structure, and its wall thickness is controlled between (L1-L2) / 10 and (L1+L2) / 5. The cross-section of the ingot 200 is circular or near-circular, and depending on the position of the support leg 101a, its cross-section has a thicker protrusion 201.

[0041] b. Place the ingot 200 into the extrusion die and extrude it through an extrusion press to obtain an aluminum alloy profile;

[0042] The extrusion die includes a die pad 1, an upper die 2, and a die sleeve 33 for fixing. A cooling system is provided on the outside of the die sleeve 33. The die pad 1 has a center hole 11, and the upper die 2 has a center hole 21 corresponding to the center hole 11. The center of the extrusion hole 21 has a core 22 that fits and passes through the center hole 11. The output end of the core 22 and the extrusion hole 21 forms a working section 211 for aluminum profile forming. The upper die 2 at the rear end of the working section 211 is a hollow section 213 for maintaining the size stability of the aluminum profile. The inner wall of the core 22 and the extrusion hole 21 forms a pre-forming area 212 of the ingot 200. The radial dimension of the core 22 located in the pre-forming area 212 gradually decreases from the center hole 11 side towards the working section 211 side, and the radial dimension of the corresponding extrusion hole 21 is set accordingly. The shape of the working section 211 is adapted to the cross-section of the aluminum profile to be formed, and the extrusion hole 21 is determined according to different product sizes. Specifically:

[0043] When the required thickness of the aluminum profile is thin or ultra-thin, the thickness of the pre-forming area 212 gradually decreases from the die pad 1 side to the working part 211 side. This allows the thickness to gradually decrease as the size of the extrusion orifice 21 changes during the extrusion process. Consequently, at the working part 211 position, the wall thickness of the ingot 200 forms a more reasonable thickness, preventing significant thickness changes during the forming of the working part 211. The extrusion process of the ingot 200 is gradual and uniform, reducing the amount of change in the internal fine grain structure.

[0044] When the required thickness of the aluminum profile is of a general size, and there are few functional support legs 101a around the aluminum profile, and the dimensional difference between the wall thickness of the ingot 200 and the wall thickness of the aluminum profile is small, the thickness of the preforming area 212 is constant. In this case, the specific forming process is no different from that of a traditional extrusion die structure, and the forming is carried out directly at the working part 211. Figure 3 The middle part is this structure;

[0045] c. The extruded aluminum alloy profiles are subjected to online water mist quenching treatment at the extrusion die exit;

[0046] d. The heat-treated aluminum alloy profiles are subjected to stretch straightening and then artificial aging to obtain aluminum profiles. In this technical solution, the specific control of the formed grain size of the aluminum profiles is designed according to the cross-sectional shape of the aluminum profiles. During the forming process of the ingot 200, pretreatment is carried out according to the cross-section of the aluminum profiles, making it have a hollow structure and restricting its thickness. The thickness is determined according to the material required for the hole 100 in the center of the aluminum profile and the support feet 101a on the corresponding sides. During the extrusion forming process, compared with the traditional solid ingot 200, the change of the internal fine grain structure during extrusion can be reduced, ensuring its uniform state, and further ensuring that the hardness of the aluminum profiles can be relatively evenly distributed. At this time, the influence of the forming structure of the mold on the grain size is greatly reduced. The main control methods can be concentrated on adjusting the supercooling degree of the profiles, modification treatment, etc. This method can form a relatively stable control system for the control of the formed grain size of the aluminum profiles, thereby improving the quality consistency of the produced aluminum profiles.

[0047] Structurally, the cooling system includes a first cooling component 4a for cooling the aluminum profiles at the output end of the working part 211 and a second cooling component 4b for cooling the extrusion die. The first cooling component 4a acts on the clearance part 213, and the second cooling component 4b acts between the upper die 2 and the die pad 1. Among them, both the first cooling component 4a and the second cooling component 4b include a nozzle 41, a hose 42 for output, a liquid nitrogen cylinder 43, and structures such as solenoid valves, safety valves, pressure gauges, and pressure regulators that are matched with the liquid nitrogen cylinder 43. The installation and connection structures of the nozzle 41 and the hose 42 can be referred to as shown in the applicant's prior application CN111346937B.

[0048] Specifically, cooling channels 44 for the coolant nitrogen in the first cooling component 4a to enter are provided on the periphery of the clearance part 213. Refer to Figure 4 , where the cooling channels 44 include an inlet channel 441 extending radially in the clearance part 213, an annular groove 442 extending around the clearance part 213, and an outlet channel 443 extending inward from the annular groove 442. The inlet channel 441 is connected to the nozzle 41. The coolant nitrogen enters inward from here and is output annularly towards the aluminum profiles through the annular groove 442 to achieve the purpose of rapid cooling to increase the supercooling degree. The second cooling component 4b can adjust the production temperature of the extrusion die during production to ensure production efficiency.

[0049] During the production process, depending on the application location, an ingot 200 can be selected. It is designed according to the cross-sectional shape of the aluminum profile. During the forming process of the ingot 200, it is pre-treated according to the cross-section of the aluminum profile to make it hollow and limit its thickness. The thickness is determined by the material required for the hole 100 in the center of the aluminum profile and the corresponding side support 101a. In the extrusion forming process, compared with the traditional solid ingot 200, it can reduce the change of internal fine grain structure during the extrusion process, ensure its uniformity, and thus ensure that the hardness of the aluminum profile can be relatively uniformly distributed. At this time, the influence of the forming structure of the mold on the grain size is greatly reduced. The main control methods can be concentrated on adjusting the supercooling of the profile and the modification treatment. This method can form a relatively stable control system for the forming grain size of the aluminum profile, thereby improving the quality consistency of the produced aluminum profile. Example 2

[0050] refer to Figure 5 In this embodiment, the extension 101 is a surface layer 101b covering one side of the base 100a. This technical solution designs product structures with different mass ratios based on different parts and structures of the product. The base 100a, as the main component, uses a high-strength aluminum alloy developed in the direction of high strength. The extension 101 can be made of aluminum alloys with different mass ratios to meet different product usage requirements. Here, elements such as Ga or Cr can be added to improve its corrosion resistance, thereby improving performance based on the raw materials and further enhancing the responsive chemical properties on the basis of traditional electrostatic spraying.

[0051] A method for preparing a 6-series aluminum alloy battery box for new energy vehicles, wherein the base 100a is a flat plate structure, and the extension 101 is a surface layer 101b covering one side surface of the base 100a, and the forming process includes the following steps:

[0052] a. Casting ingot 200: The ingot 200 includes a main ingot located at the upper end as the material of the base 100a and a support ingot 201 located at the lower end as the material of the extension 101. During the production process, the support ingot 201 used for the extension 101 is partially melted and joined with the main ingot to form a composite structure ingot 200. The support ingot 201 covers at least 1 / 2 of the surface of the main ingot.

[0053] b. Place the ingot 200 into the extrusion die and extrude it through the extruder to obtain an aluminum alloy profile blank. The cross-section of the blank is the cross-sectional shape of the base 100a and the surface layer 101b.

[0054] refer to Figure 6The extrusion die includes a die pad 1, an upper die 2, and a die sleeve 3 for fixing. A cooling system is provided on the outside of the die sleeve 3. The die pad 1 has a pad hole 11 in the center, and the upper die 2 has an extrusion hole 21 corresponding to the pad hole 11 in the center. The extrusion hole 21 has a working part 211 for forming, a hollow part 213 located at the rear end of the working part 211, and a pre-forming area 212 located at the front end of the working part 211. The radial dimension of the pre-forming area 212 gradually decreases from the pad hole 11 side to the working part 211 side. In this way, a large-area base structure 100a with a high-strength structure on one side and a surface layer 101b with high chemical properties on the bottom are formed by the extrusion die. It can be applied to the split cover of the new energy battery box to form a composite structure with a corrosion-resistant outer surface and a high-strength inner surface.

[0055] c. The extruded aluminum alloy profiles are subjected to online water mist quenching treatment at the extrusion die exit;

[0056] d. The quenched aluminum alloy profile is stretched and straightened, and then artificially aged to obtain the aluminum profile.

[0057] Unlike Example 1, this example uses a dual-ratio ingot 200 structure, with an aluminum alloy of high chemical properties such as corrosion resistance coated on the base 100a which is mainly in the high-strength direction, forming a surface layer 101b structure with different characteristics. This surface layer 101b structure can be applied to the outer surface of the battery box of new energy vehicles, in conjunction with traditional electrostatic spraying, to further improve the corrosion resistance of the battery box surface.

[0058] This production method has a wide range of applications. It can use profiles with different proportions to be extruded in one go according to different needs, and it can be applied to a variety of related or similar fields. It is versatile and practical.

[0059] Although the invention has been specifically shown and described in conjunction with preferred embodiments, those skilled in the art should understand that various changes in form and detail may be made to the invention without departing from the spirit and scope of the invention as defined in the appended claims, all of which shall be within the scope of protection of the invention.

Claims

1. A 6-series aluminum alloy for a new energy vehicle battery box, characterized in that: Its cross-section has a base (100a) as the main body and an extension (101) extending outward from the base (100a), wherein the base (100a) and the extension (101) adopt different component ratios: The base (100a) comprises the following components in the following mass percentages: Si 1.35–1.45%, Fe 0.21%, Cu 0.05%, Mn 0.44–0.48%, Mg 0.50–0.55%, Zn 0.05%, Ti 0.02%, total impurities ≤0.15%, balance Al; The extension (101) comprises the following components in the following mass percentages: Si 1.05-1.5%, Fe ≤0.5%, Cu ≤0.5%, Mn 0.44-0.48%, Mg 0.80-1.55%, Zn ≤0.08%, Ti 0.06-0.08%, Ga or Cr 0.3-0.5%, total impurities ≤0.15%, and the balance Al.

2. The 6-series aluminum alloy battery box for new energy vehicles according to claim 1, characterized in that: The extension (101) is a functional support leg (101a) that extends outward from the base (100a) in all directions.

3. The 6-series aluminum alloy battery box for new energy vehicles according to claim 1, characterized in that: The extension (101) is a surface layer (101b) covering one side surface of the base (100a).

4. A method for preparing a 6-series aluminum alloy battery box for new energy vehicles according to claim 1, characterized in that, The base (100a) is a square structure with a hole (100) in the center. The extension (101) is a functional support (101a) extending from the base (100a) in all directions. The center of the hole (100) is taken as the base point, the distance from the base point to the side wall of the hole (100) is L1, and the overall wall thickness of the aluminum profile is L2. Its forming process includes the following steps: a. Casting ingot (200): The ingot (200) includes a hollow main ingot and support ingots (201) attached to the outer surface of the ingot (200). The number of support ingots (201) is the same as the number of support feet (101a) and they are distributed in the same position. The wall thickness of the main ingot is controlled between (L1-L2) / 10 and (L1+L2) / 5. The cross-section of the main ingot is circular or near-circular. The main ingot and the support ingots (201) adopt different component ratios. b. Place the ingot (200) into the extrusion die and extrude it through the extruder to obtain an aluminum alloy profile blank. The cross-section of the blank is the cross-sectional shape of the base (100a) and the support (101a). The extrusion die includes a die pad (1), an upper die (2), and a die sleeve (3) for fixing. A cooling system is provided on the outside of the die sleeve (3). The die pad (1) has a pad hole (11) in the center, and the upper die (2) has an extrusion hole (21) in the center corresponding to the pad hole (11). The center of the extrusion hole (21) is provided with a core (22) that fits and passes through the pad hole (11). The core (22) and the output end of the extrusion hole (21) are the working parts for aluminum profile forming. (211), the upper mold (2) at the rear end of the working part (211) is a hollow part (213) for maintaining the size stability of the aluminum profile, the inner wall of the core (22) and the extrusion hole (21) is the pre-forming area (212) of the ingot (200), the radial dimension of the core (22) located in the pre-forming area (212) gradually decreases from the pad hole (11) side to the working part (211) side, and the radial dimension of the extrusion hole (21) at the corresponding position is set accordingly; c. The extruded aluminum alloy profiles are subjected to online water mist quenching treatment at the extrusion die exit; d. The quenched aluminum alloy profile is stretched and straightened, and then artificially aged to obtain the aluminum profile.

5. The method for preparing a 6-series aluminum alloy battery box for new energy vehicles according to claim 4, characterized in that: The cooling system includes a first cooling component (4a) for cooling the aluminum profile at the output end of the working part (211) and a second cooling component (4b) for cooling the extrusion die. The first cooling component (4a) acts on the empty blade part (213), and the second cooling component (4b) acts between the upper die (2) and the die pad (1).

6. The method for preparing a 6-series aluminum alloy battery box for new energy vehicles according to claim 5, characterized in that: The hollow blade section (213) has a cooling channel (44) on its periphery for the entry of liquid nitrogen from the first cooling assembly (4a).

7. The method for preparing a 6-series aluminum alloy battery box for new energy vehicles according to claim 4, characterized in that: The thickness of the preformed area (212) is constant.

8. A method for preparing a 6-series aluminum alloy battery box for new energy vehicles according to claim 1, characterized in that: The base (100a) is a flat plate structure, and the extension (101) is a surface layer (101b) covering one side of the base (100a). Its forming process includes the following steps: a. Casting ingot (200): The ingot (200) includes a main ingot located at the upper end as the material of the base (100a) and a support ingot (201) located at the lower end as the material of the extension (101). The support ingot (201) covers at least 1 / 2 of the surface of the main ingot. The main ingot and the support ingot (201) have different composition ratios. b. Place the ingot (200) into the extrusion die and extrude it through the extruder to obtain an aluminum alloy profile blank. The cross-section of the blank is the cross-sectional shape of the base (100a) and the surface layer (101b). The extrusion die includes a die pad (1), an upper die (2), and a die sleeve (3) for fixing. A cooling system is provided on the outside of the die sleeve (3). The die pad (1) has a die hole (11) in the center. The upper die (2) has an extrusion hole (21) corresponding to the die hole (11) in the center. The extrusion hole (21) has a working part (211) for forming, a hollow part (213) located at the rear end of the working part (211), and a preforming area (212) located at the front end of the working part (211). The radial dimension of the preforming area (212) gradually decreases from the side of the die hole (11) to the side of the working part (211). c. The extruded aluminum alloy profiles are subjected to online water mist quenching treatment at the extrusion die exit; d. The quenched aluminum alloy profile is stretched and straightened, and then artificially aged to obtain the aluminum profile.

Images