Processing method for improving hardness of aluminum alloy

Abstract

The invention relates to a processing method for improving the hardness of an aluminum alloy, which comprises the following steps: (1) carrying out cold rolling treatment on an aluminum alloy round ingot, namely sequentially carrying out first-pass cold rolling, second-pass cold rolling, third-pass cold rolling and fourth-pass cold rolling in a clockwise direction or an anticlockwise direction, the direction of each pass of cold rolling is in the radial direction of the round ingot; and (2) the cold-rolled ingot obtained in the step (1) is subjected to annealing treatment, and the processed aluminum alloy is obtained. According to the machining method, the hardness of the aluminum alloy can be effectively improved, meanwhile, high tensile strength and yield strength are kept, and high machining efficiency is achieved.

Description

Technical Field

[0001] The invention relates to the technical field of aluminum alloy processing, and in particular to a processing method for improving the hardness of aluminum alloy. Background Art

[0002] A6061 aluminum is a heat-treatable alloy with good formability, weldability, machinability, etc. It also has medium strength and can maintain good operability after annealing. It also has good corrosion resistance, high toughness, and is easy to polish. It is often used as the backing plate of the target in the target production process.

[0003] However, in the actual use of the target, the target may be deformed due to insufficient hardness of the backing plate, which may lead to abnormal use. If other aluminum alloys with higher hardness are selected, the material properties may be changed, affecting the overall quality of the target and increasing the risk of use.

[0004] CN111644547A discloses a forging process of 5083 aluminum alloy, including: (1) blanking: the blanking weight is 19 kg, and the blanking is performed by an extruded aluminum rod sawing machine, and the raw material size is (2) Forging: Heating is carried out in a box-type resistance furnace at a temperature of 480°C. The forging material is kept warm for 2 hours before being upset to a height of 165 mm. The forging center is punched by a punch. Hole; (3) Hole expansion: The horse frame is expanded to The height is trimmed to 160 mm and air-cooled to room temperature after forging; (4) Heat treatment: The forged parts are kept at 400°C for 2 hours and then air-cooled to room temperature. However, the above forging method is not suitable for A6061 aluminum alloy and cannot meet the strength requirements of the target backing plate.

[0005] Therefore, providing a processing method that can effectively improve the hardness of A6061 aluminum alloy is a technical problem that needs to be solved in the current field. Summary of the invention

[0006] In view of the above problems, the purpose of the present invention is to provide a processing method for improving the hardness of aluminum alloy. Compared with the prior art, the processing method provided by the present invention can effectively improve the hardness of aluminum alloy while maintaining high tensile strength and yield strength, and has high processing efficiency.

[0007] In order to achieve the purpose of the invention, the present invention adopts the following technical solutions:

[0008] The present invention provides a processing method for improving the hardness of an aluminum alloy, the processing method comprising the following steps:

[0009] (1) subjecting the aluminum alloy round ingot to cold rolling treatment, wherein the cold rolling treatment comprises a first cold rolling pass, a second cold rolling pass, a third cold rolling pass and a fourth cold rolling pass sequentially performed in a clockwise direction or a counterclockwise direction, wherein the direction of each cold rolling pass is along the radial direction of the round ingot, to obtain a cold-rolled ingot;

[0010] (2) Annealing the cold-rolled ingot obtained in step (1) to obtain a processed aluminum alloy.

[0011] In the processing method provided by the present invention, on the one hand, through the combined operation of the first cold rolling pass, the second cold rolling pass, the third cold rolling pass and the fourth cold rolling pass, the cold rolling passes are controlled to be carried out in sequence in a clockwise direction or a counterclockwise direction and the rolling direction of each pass is along the radial direction, so that the aluminum alloy can undergo uniform plastic deformation in a specific sequence, change the microstructure of the alloy, and improve the hardness of the aluminum alloy; on the other hand, the ductility of the aluminum alloy is enhanced through annealing treatment, so that it maintains a high tensile strength and yield strength, which is beneficial to subsequent processing and forming.

[0012] In the present invention, the direction of each cold rolling pass is along the radial direction of the ingot, which means that the ingot is cold rolled from one point on the circumference of the ingot to another point on the circumference along the radial direction.

[0013] Preferably, the aluminum alloy ingot comprises A6061 alloy.

[0014] Preferably, the cold rolling process is performed in a twin-roll mill.

[0015] Preferably, the direction of the first cold rolling pass is any radial direction. Starting from the radial direction of the first cold rolling pass and taking the center of the ingot as the rotation center, the direction is rotated 40-50° in a clockwise or counterclockwise direction to the radial direction of the second cold rolling pass, for example, it can be 40°, 42°, 44°, 45°, 46°, 48° or 50°, but is not limited to the listed values, and other values ​​not listed in the numerical range are also applicable; continue to rotate in the same direction to the radial direction of the third cold rolling pass and the radial direction of the third cold rolling pass is perpendicular to the radial direction of the first cold rolling pass; then continue to rotate in the same direction 40-50° to the radial direction of the fourth cold rolling pass, for example, it can be 40°, 42°, 44°, 45°, 46°, 48° or 50°, but is not limited to the listed values, and other values ​​not listed in the numerical range are also applicable.

[0016] In the present invention, by controlling the rolling directions of the first to fourth cold rolling passes, the aluminum alloy can be uniformly deformed in all directions, so that its internal stress is evenly distributed, local stress concentration is reduced, internal defects are reduced, and the hardness of the aluminum alloy is significantly improved.

[0017] Preferably, the total deformation of the ingot after cold rolling is 19.5-20.5%, for example, it can be 19.5%, 19.6%, 19.7%, 19.8%, 19.9%, 20.0%, 20.1%, 20.2%, 20.3%, 20.4% or 20.5%, but is not limited to the listed values, and other unlisted values ​​within the numerical range are also applicable.

[0018] In the present invention, the total deformation of the ingot after cold rolling is controlled because the hardness of the aluminum alloy increases with the increase in deformation. However, when the deformation is too large, the hardness increases slowly and the ductility deteriorates. Therefore, the present invention can further ensure that the aluminum alloy has a higher hardness, as well as a higher tensile strength and yield strength by preferably controlling the total deformation.

[0019] Preferably, the roller spacing of the first cold rolling pass is 58-59 mm, for example, it can be 58 mm, 58.2 mm, 58.4 mm, 58.6 mm, 58.8 mm or 59 mm, but is not limited to the listed values, and other unlisted values ​​within the numerical range are also applicable.

[0020] Preferably, the roller speed of the first cold rolling pass is 18-20r / min, for example, it can be 18r / min, 18.5r / min, 19r / min, 19.5r / min or 20r / min, but is not limited to the listed values, and other unlisted values ​​within the numerical range are also applicable.

[0021] Preferably, the deformation of the first cold rolling is 9.5-10.5%, for example, it can be 9.5%, 9.6%, 9.8%, 10%, 10.2%, 10.4% or 10.5%, but is not limited to the listed values, and other unlisted values ​​within the numerical range are also applicable.

[0022] Preferably, the roller spacing of the second cold rolling pass is 55-56 mm, for example, it can be 55 mm, 55.2 mm, 55.4 mm, 55.6 mm, 55.8 mm or 56 mm, but is not limited to the listed values, and other unlisted values ​​within the numerical range are also applicable.

[0023] Preferably, the roller speed of the second cold rolling is 18-20r / min, for example, it can be 18r / min, 18.5r / min, 19r / min, 19.5r / min or 20r / min, but is not limited to the listed values, and other unlisted values ​​within the numerical range are also applicable.

[0024] Preferably, the deformation of the second cold rolling is 4.5-5.5%, for example, it can be 4.5%, 4.6%, 4.8%, 5%, 5.2%, 5.4% or 5.5%, but is not limited to the listed values, and other unlisted values ​​within the numerical range are also applicable.

[0025] Preferably, the roller spacing of the third cold rolling pass is 53-54 mm, for example, it can be 53 mm, 53.2 mm, 53.4 mm, 53.6 mm, 53.8 mm or 54 mm, but is not limited to the listed values, and other unlisted values ​​within the numerical range are also applicable.

[0026] Preferably, the roller speed of the third cold rolling pass is 16-18r / min, for example, it can be 16r / min, 16.5r / min, 17r / min, 17.5r / min or 18r / min, but is not limited to the listed values, and other unlisted values ​​within the numerical range are also applicable.

[0027] Preferably, the deformation of the third cold rolling is 2.5-3.5%, for example, it can be 2.5%, 2.8%, 3%, 3.2%, 3.4% or 3.5%, but is not limited to the listed values, and other unlisted values ​​within the numerical range are also applicable.

[0028] Preferably, the roller spacing of the fourth cold rolling pass is 51-52 mm, for example, it can be 51 mm, 51.2 mm, 51.4 mm, 51.6 mm, 51.8 mm or 52 mm, but is not limited to the listed values, and other unlisted values ​​within the numerical range are also applicable.

[0029] Preferably, the roller speed of the fourth cold rolling pass is 14-16r / min, for example, it can be 14r / min, 14.5r / min, 15r / min, 15.5r / min or 16r / min, but is not limited to the listed values, and other unlisted values ​​within the numerical range are also applicable.

[0030] Preferably, the deformation of the fourth cold rolling is 1.5-2.5%, for example, it can be 1.5%, 1.6%, 1.8%, 2%, 2.2%, 2.4% or 2.5%, but is not limited to the listed values, and other unlisted values ​​within the numerical range are also applicable.

[0031] In the present invention, by controlling the roller spacing, rotation speed and deformation amount in each cold rolling pass, the deformation degree of the aluminum alloy can be more accurately controlled, thereby ensuring that it reaches a higher hardness.

[0032] Preferably, the annealing temperature is 240-260°C, for example, it can be 240°C, 242°C, 246°C, 248°C, 250°C, 252°C, 254°C, 256°C, 258°C or 260°C, but is not limited to the listed values, and other unlisted values ​​within the numerical range are also applicable.

[0033] Preferably, the annealing treatment time is 20-25 min, for example, it can be 20 min, 21 min, 22 min, 23 min, 24 min or 25 min, but it is not limited to the listed values, and other unlisted values ​​within the numerical range are also applicable.

[0034] In the present invention, by optimally controlling the temperature and time of the annealing treatment, the hardness, tensile strength and yield strength of the aluminum alloy can be matched in a better state, that is, while achieving a higher hardness, its tensile strength and yield strength are guaranteed, and ultimately excellent overall performance is obtained, which is beneficial to subsequent processing.

[0035] As a preferred technical solution of the present invention, the processing method comprises the following steps:

[0036] (1) cold rolling the aluminum alloy ingot, the cold rolling comprising: firstly, cold rolling the ingot in a radial direction for a first time at a roller spacing of 58-59 mm and a roller speed of 18-20 r / min until the deformation is 9.5-10.5%, then, starting from the radial direction of the first cold rolling and taking the center of the ingot as the rotation center, rotating 40-50° in a clockwise or counterclockwise direction to the radial direction of the second cold rolling, cold rolling the ingot in a second time at a roller spacing of 55-56 mm and a roller speed of 18-20 r / min until the deformation is 4.5-5.5%, and then continuing to rotate in the same direction. Rotate to the radial direction of the third cold rolling, and the radial direction of the third cold rolling is perpendicular to the radial direction of the first cold rolling, and perform the third cold rolling to a deformation of 2.5-3.5% under the conditions of a roller spacing of 53-54 mm and a roller speed of 16-18 r / min, and finally continue to rotate 40-50° in the same direction to the radial direction of the fourth cold rolling, and perform the fourth cold rolling to a deformation of 1.5-2.5% under the conditions of a roller spacing of 51-52 mm and a roller speed of 14-16 r / min, to obtain a cold-rolled ingot, wherein the total deformation of the cold-rolled ingot is 19.5-20.5%;

[0037] (2) The cold-rolled ingot obtained in step (1) is annealed at a temperature of 240-260° C. for 20-25 min to obtain a processed aluminum alloy.

[0038] Compared with the prior art, the present invention has the following beneficial effects:

[0039] In the processing method provided by the present invention, on the one hand, by performing cold rolling treatment, the aluminum alloy can undergo uniform plastic deformation in a specific order, change the microstructure of the alloy, and improve the hardness of the aluminum alloy; on the other hand, the ductility of the aluminum alloy is enhanced by annealing treatment, so that it maintains a high tensile strength and yield strength, which is beneficial to subsequent processing and forming. Under optimal conditions, taking A6061 alloy as an example, the hardness of the aluminum alloy can reach above 423HL, the tensile strength can reach above 278MPa, and the yield strength can reach above 233MPa. DETAILED DESCRIPTION

[0040] The technical solution of the present invention is further described below by specific implementation methods. It should be understood by those skilled in the art that the embodiments are only to help understand the present invention and should not be regarded as specific limitations of the present invention.

[0041] Example 1

[0042] This embodiment provides a processing method for improving the hardness of aluminum alloy, and the processing method comprises the following steps:

[0043] (1) A6061 aluminum alloy round ingot is subjected to cold rolling treatment, wherein the cold rolling treatment comprises: firstly, a first cold rolling is performed in a radial direction under the condition that the roller spacing is 58.5 mm and the roller speed is 19 r / min until the deformation amount is 10%, then, starting from the radial direction of the first cold rolling and taking the center of the round ingot as the rotation center, the round ingot is rotated 45° in a clockwise direction to the radial direction of the second cold rolling, and a second cold rolling is performed under the condition that the roller spacing is 55.5 mm and the roller speed is 19 r / min until the deformation amount is 5%, and then the round ingot is rotated in the same direction to the radial direction of the third cold rolling and the third cold rolling is performed. The radial direction of the cold rolling is perpendicular to the radial direction of the first cold rolling, and the third cold rolling is performed under the conditions of a roller spacing of 53.5 mm and a roller speed of 17 r / min until the deformation is 3%, and finally the fourth cold rolling is performed in the same direction by 45° to the radial direction of the fourth cold rolling, and the fourth cold rolling is performed under the conditions of a roller spacing of 51.5 mm and a roller speed of 15 r / min until the deformation is 2%, to obtain a cold-rolled ingot, and the total deformation of the cold-rolled ingot is 20%; in this embodiment, the direction of each cold rolling is along the radial direction of the round ingot, which means that the round ingot is cold-rolled from one point on the circumference of the round ingot to another point on the circumference along the radial direction;

[0044] (2) The cold-rolled ingot obtained in step (1) is annealed at a temperature of 250° C. for 22 minutes to obtain a processed aluminum alloy.

[0045] Example 2

[0046] This embodiment provides a processing method for improving the hardness of aluminum alloy, and the processing method comprises the following steps:

[0047] (1) A6061 aluminum alloy round ingot is subjected to cold rolling treatment, wherein the cold rolling treatment comprises: firstly, a first cold rolling is performed in a radial direction under the condition that the roller spacing is 58 mm and the roller speed is 20 r / min until the deformation amount is 9.5%, then, starting from the radial direction of the first cold rolling and taking the center of the round ingot as the rotation center, the round ingot is rotated 50° in a clockwise direction to the radial direction of the second cold rolling, and a second cold rolling is performed under the condition that the roller spacing is 55 mm and the roller speed is 18 r / min until the deformation amount is 5.5%, and then the round ingot is rotated in the same direction to the radial direction of the third cold rolling, and the third cold rolling is performed The radial direction of the cold rolling is perpendicular to the radial direction of the first cold rolling, and the third cold rolling is performed under the conditions of a roller spacing of 53mm and a roller speed of 18r / min until the deformation is 2.5%, and finally the cold rolling is continued in the same direction by 50° to the radial direction of the fourth cold rolling, and the fourth cold rolling is performed under the conditions of a roller spacing of 51mm and a roller speed of 16r / min until the deformation is 2%, to obtain a cold-rolled ingot, and the total deformation of the cold-rolled ingot is 19.5%; in this embodiment, the direction of each cold rolling is along the radial direction of the round ingot, which means that the round ingot is cold-rolled from one point on the circumference of the round ingot to another point on the circumference along the radial direction;

[0048] (2) The cold-rolled ingot obtained in step (1) is annealed at a temperature of 240° C. for 25 minutes to obtain a processed aluminum alloy.

[0049] Example 3

[0050] This embodiment provides a processing method for improving the hardness of aluminum alloy, and the processing method comprises the following steps:

[0051] (1) A6061 aluminum alloy round ingot is subjected to cold rolling treatment, wherein the cold rolling treatment comprises: firstly, a first cold rolling is performed in a radial direction under the condition that the roller spacing is 59 mm and the roller speed is 18 r / min until the deformation amount is 10%, then, starting from the radial direction of the first cold rolling and taking the center of the round ingot as the rotation center, the round ingot is rotated 40° in a counterclockwise direction to the radial direction of the second cold rolling, and a second cold rolling is performed under the condition that the roller spacing is 56 mm and the roller speed is 20 r / min until the deformation amount is 4.5%, and then the round ingot is rotated in the same direction to the radial direction of the third cold rolling and the third cold rolling is performed. The radial direction is perpendicular to the radial direction of the first cold rolling, and the third cold rolling is performed under the conditions of a roller spacing of 54 mm and a roller speed of 16 r / min until the deformation is 3.5%, and finally the fourth cold rolling is performed in the same direction by 40° to the radial direction of the fourth cold rolling, and the fourth cold rolling is performed under the conditions of a roller spacing of 52 mm and a roller speed of 14 r / min until the deformation is 2.5%, to obtain a cold-rolled ingot, and the total deformation of the cold-rolled ingot is 20.5%; in this embodiment, the direction of each cold rolling is along the radial direction of the round ingot, which means that the round ingot is cold-rolled from one point on the circumference of the round ingot to another point on the circumference along the radial direction;

[0052] (2) The cold-rolled ingot obtained in step (1) is annealed at a temperature of 260° C. for 20 minutes to obtain a processed aluminum alloy.

[0053] Example 4

[0054] This embodiment provides a processing method for improving the hardness of aluminum alloy. The only difference compared with Embodiment 1 is that the total deformation of the ingot after cold rolling is 18%.

[0055] Example 5

[0056] This embodiment provides a processing method for improving the hardness of aluminum alloy. The only difference compared with Embodiment 1 is that the total deformation of the ingot after cold rolling is 22%.

[0057] Example 6

[0058] This embodiment provides a processing method for improving the hardness of aluminum alloy. The only difference compared with Embodiment 1 is that the annealing temperature is 220°C.

[0059] Example 7

[0060] This embodiment provides a processing method for improving the hardness of aluminum alloy. The only difference compared with Embodiment 1 is that the annealing temperature is 280°C.

[0061] Example 8

[0062] This embodiment provides a processing method for improving the hardness of aluminum alloy. The only difference compared with Example 1 is that the radial direction of the first cold rolling is used as the starting point, the center of the ingot is used as the rotation center, and the radial direction of the second cold rolling is rotated 30° clockwise.

[0063] Example 9

[0064] This embodiment provides a processing method for improving the hardness of aluminum alloy. The only difference compared with Embodiment 1 is that the radial direction of the third cold rolling pass is continuously rotated 60° clockwise to the radial direction of the fourth cold rolling pass.

[0065] Comparative Example 1

[0066] This comparative example provides a method for processing an aluminum alloy, which differs from Example 1 only in that no annealing treatment is performed.

[0067] Comparative Example 2

[0068] This comparative example provides a method for processing an aluminum alloy, which differs from Example 1 only in that the second cold rolling is not performed.

[0069] Comparative Example 3

[0070] This comparative example provides a method for processing an aluminum alloy, which differs from Example 1 only in that the third cold rolling is not performed.

[0071] Comparative Example 4

[0072] This comparative example provides a method for processing an aluminum alloy, which differs from Example 1 only in that the fourth cold rolling is not performed.

[0073] The processed aluminum alloys obtained in Examples 1-9 and Comparative Examples 1-4 were tested, wherein the hardness was tested using a Leeb hardness tester, the tensile strength was tested using a universal testing machine, and the yield strength was tested using a universal testing machine. The results are shown in Table 1.

[0074] Table 1

[0075]

[0076]

[0077] From the data in Table 1, we can see the following points:

[0078] (1) It can be seen from the data of Examples 1-3 that, under optimal conditions, the processing method provided by the present invention can make the hardness of the aluminum alloy reach above 423HL, the tensile strength reach above 278MPa, and the yield strength reach above 233MPa.

[0079] (2) A comprehensive comparison of the data of Example 1 and Examples 4-5 shows that the hardness, tensile strength and yield strength in Example 1 are significantly higher than those in Examples 4-5. This shows that the present invention can improve the hardness of the aluminum alloy while ensuring good comprehensive mechanical properties by optimally controlling the total deformation of the ingot after cold rolling.

[0080] (3) Comprehensively comparing the data of Example 1, Examples 6-7 and Comparative Example 1, it can be seen that the hardness, tensile strength and yield strength in Example 1 are significantly higher than those in Examples 6-7 and Comparative Example 1. This shows that the present invention can ensure that the aluminum alloy has good hardness and strength and has excellent comprehensive performance by performing annealing treatment and preferably controlling the temperature of the annealing treatment.

[0081] (4) A comprehensive comparison of the data of Example 1 and Examples 8-9 shows that the present invention can further promote uniform stress distribution by optimally controlling the cold rolling direction of each pass in the cold rolling process, thereby improving the comprehensive properties of the aluminum alloy.

[0082] (5) A comprehensive comparison of the data of Example 1 and Comparative Examples 2-4 shows that the present invention can improve the hardness of the aluminum alloy while making the aluminum alloy have good comprehensive properties by performing the first to fourth cold rolling passes.

[0083] In summary, the processing method provided by the present invention can effectively improve the hardness of aluminum alloy while maintaining high tensile strength and yield strength, and has high processing efficiency.

[0084] The applicant declares that the above is only a specific implementation mode of the present invention, but the protection scope of the present invention is not limited thereto. Those skilled in the art should understand that any changes or substitutions that can be easily thought of by those skilled in the art within the technical scope disclosed by the present invention shall fall within the protection scope and disclosure scope of the present invention.

Claims

1. A processing method for improving the hardness of aluminum alloy, characterized in that: The processing method comprises the following steps: (1) subjecting the aluminum alloy round ingot to cold rolling treatment, wherein the cold rolling treatment comprises a first cold rolling pass, a second cold rolling pass, a third cold rolling pass and a fourth cold rolling pass sequentially performed in a clockwise direction or a counterclockwise direction, wherein the direction of each cold rolling pass is along the radial direction of the round ingot, to obtain a cold-rolled ingot; (2) Annealing the cold-rolled ingot obtained in step (1) to obtain a processed aluminum alloy.

2. The processing method according to claim 1, characterized in that: The aluminum alloy ingot comprises A6061 alloy; Preferably, the cold rolling process is carried out in a twin-roll mill; Preferably, the direction of the first cold rolling is any radial direction, starting from the radial direction of the first cold rolling and taking the center of the round ingot as the rotation center, rotating 40-50° in a clockwise or counterclockwise direction to the radial direction of the second cold rolling; continuing to rotate in the same direction to the radial direction of the third cold rolling and the radial direction of the third cold rolling is perpendicular to the radial direction of the first cold rolling; then continuing to rotate in the same direction 40-50° to the radial direction of the fourth cold rolling; Preferably, the total deformation of the ingot after cold rolling is 19.5-20.5%.

3. The processing method according to claim 1 or 2, characterized in that: The roller spacing of the first cold rolling is 58-59 mm; Preferably, the roller speed of the first cold rolling is 18-20 r / min.

4. The processing method according to any one of claims 1 to 3, characterized in that: The deformation amount of the first cold rolling is 9.5-10.5%.

5. The processing method according to any one of claims 1 to 4, characterized in that: The roller spacing of the second cold rolling is 55-56mm; Preferably, the roller speed of the second cold rolling is 18-20 r / min.

6. The processing method according to any one of claims 1 to 5, characterized in that: The deformation amount of the second cold rolling is 4.5-5.5%.

7. The processing method according to any one of claims 1 to 6, characterized in that: The roller spacing of the third cold rolling is 53-54 mm; Preferably, the roller speed of the third cold rolling is 16-18 r / min; Preferably, the deformation amount of the third cold rolling is 2.5-3.5%.

8. The processing method according to any one of claims 1 to 7, characterized in that: The roller spacing of the fourth cold rolling is 51-52 mm; Preferably, the roller speed of the fourth cold rolling is 14-16r / min; Preferably, the deformation amount of the fourth cold rolling is 1.5-2.5%.

9. The processing method according to any one of claims 1 to 8, characterized in that: The annealing temperature is 240-260°C; Preferably, the annealing treatment time is 20-25 minutes.

10. The processing method according to any one of claims 1 to 9, characterized in that: The processing method comprises the following steps: (1) cold rolling the aluminum alloy ingot, the cold rolling comprising: firstly, cold rolling the ingot in a radial direction for a first time at a roller spacing of 58-59 mm and a roller speed of 18-20 r / min until the deformation is 9.5-10.5%, then, starting from the radial direction of the first cold rolling and taking the center of the ingot as the rotation center, rotating 40-50° in a clockwise or counterclockwise direction to the radial direction of the second cold rolling, cold rolling the ingot in a second time at a roller spacing of 55-56 mm and a roller speed of 18-20 r / min until the deformation is 4.5-5.5%, and then continuing to rotate in the same direction. Rotate to the radial direction of the third cold rolling, and the radial direction of the third cold rolling is perpendicular to the radial direction of the first cold rolling, and perform the third cold rolling to a deformation of 2.5-3.5% under the conditions of a roller spacing of 53-54 mm and a roller speed of 16-18 r / min, and finally continue to rotate 40-50° in the same direction to the radial direction of the fourth cold rolling, and perform the fourth cold rolling to a deformation of 1.5-2.5% under the conditions of a roller spacing of 51-52 mm and a roller speed of 14-16 r / min, to obtain a cold-rolled ingot, wherein the total deformation of the cold-rolled ingot is 19.5-20.5%; (2) The cold-rolled ingot obtained in step (1) is annealed at a temperature of 240-260° C. for 20-25 min to obtain a processed aluminum alloy.

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