Manufacturing method of high-elongation 5052 aluminum alloy plate for deep drawing

Abstract

The invention discloses a manufacturing method of a high-elongation 5052 aluminum alloy plate for deep drawing, and belongs to the technical field of aluminum alloy machining. The invention aims to obtain higher elongation, improve the punching performance of the 5052 plate and meet the use requirement of a user on high punching depth. The method comprises the following steps: 1, weighing smelting raw materials according to the following components in percentage by weight: less than 0.1% of Cu, less than 0.1% of Mn, less than 0.25% of Si, less than 0.4% of Fe, 2.2-2.4% of Mg, 0.15-0.25% of Cr, less than 0.1% of Zn and the balance of Al, and smelting to obtain an aluminum alloy solution; 2, casting to obtain an aluminum alloy cast ingot, performing homogenizing annealing and hot rolling, and performing cold rolling to obtain a cold-rolled coiled material; and 3, shearing after air cushion type annealing. The low recrystallization temperature is obtained by controlling material components, meanwhile, after the material is subjected to certain cold deformation, the appropriate finished product annealing temperature is matched, the anisotropy of the material is improved, and therefore the punching performance of the 5052 plate is improved.

Description

Technical Field

[0001] The invention belongs to the technical field of aluminum alloy processing, and specifically relates to a method for manufacturing a high-elongation 5052 aluminum alloy plate for deep drawing. Background Art

[0002] 5052 aluminum alloy sheet is widely used in aerospace, marine, rail transportation, and other fields; it has good corrosion resistance and welding performance, medium strength, and good cold processing performance. In the subsequent use process, the forming method is mainly bending and punching. With the continuous increase in market demand, the comprehensive performance requirements of materials are gradually increasing, especially the requirements for punching performance; however, there is a problem of low elongation, so it cannot meet the user's high punching depth requirements. Summary of the invention

[0003] The purpose of the present invention is to solve the above technical problems and provide a method for manufacturing a 5052 aluminum alloy sheet with high elongation for deep drawing; thereby obtaining a higher elongation, improving the punching performance of the 5052 sheet, and meeting the user's requirements for high punching depth.

[0004] A method for manufacturing a high-elongation 5052 aluminum alloy sheet for deep drawing is carried out according to the following steps:

[0005] 1. According to the weight percentage composition of Cu<0.1%, Mn<0.1%, Si<0.25%, Fe<0.4%, Mg: 2.2%-2.4%, Cr: 0.15%-0.25%, Zn<0.1% and the balance Al, weigh the smelting raw materials and smelt them to obtain an aluminum alloy solution;

[0006] 2. The aluminum alloy solution is melt-casted to obtain an aluminum alloy ingot, which is then homogenized, annealed, and hot-rolled to a thickness of 5.0 mm to obtain a hot-rolled billet, which is then cold-rolled to a thickness of 1.5 to 2.5 mm to obtain a cold-rolled coil;

[0007] 3. The cold rolled coil is subjected to air cushion annealing, and then the annealed coil is handed over to a shearing machine to be sheared to corresponding specifications to obtain a high elongation 5052 aluminum alloy sheet for deep drawing, thus completing the manufacturing method.

[0008] Furthermore, the smelting and casting in step 2 is performed according to the current 5052 smelting and casting process, with a casting temperature of 660°C to 700°C, a smelting and casting speed of 50 to 60 mm / min, a casting cooling water pressure of 0.003 to 0.1 MPa, and a cooling water temperature of 20°C to 26°C.

[0009] Furthermore, the homogenization annealing in step 2: the furnace gas is kept at a constant temperature of 470° C., and the steel is taken out of the furnace after heating for 15 hours.

[0010] Furthermore, the air cushion annealing in step three: the furnace temperature is 455-460° C., the speed is 20 m / min-35 m / min, the pure stretching has an elongation of 0.02%.

[0011] Advantages of the present invention:

[0012] The present invention performs homogenization annealing treatment on the 5052 alloy with a low alloying degree, improves the problem of component and structure segregation in the original structure of the ingot, and lays a foundation for the finished product to obtain good comprehensive performance; at the same time, the composition is finely regulated, and the control range of main alloying elements such as Mg and Cr is tightened to determine a lower recrystallization temperature range to ensure performance; a continuous annealing line is used to perform heat treatment on the 5052 alloy, so that the material can quickly reach temperature to obtain uniform and fine grains to improve its elongation; the cold deformation degree and the finished product annealing system are matched, so that the material obtains good anisotropy. According to the above four aspects of innovation, the punching performance point of the 5052 plate is improved, and the elongation of the produced 5052 plate can reach 25%, and at the same time, it can be guaranteed that the punching height of 200mm is free of cracks.

[0013] The invention is suitable for manufacturing high-elongation 5052 aluminum alloy plates for deep drawing. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is a 100-fold longitudinal polarization image of the high-elongation 5052 aluminum alloy sheet for deep drawing prepared in the example. DETAILED DESCRIPTION

[0015] The technical solution of the present invention is not limited to the specific implementation modes listed below, but also includes any combination of the specific implementation modes.

[0016] Specific implementation method 1: This implementation method is a method for manufacturing a high elongation 5052 aluminum alloy sheet for deep drawing, which is carried out according to the following steps:

[0017] 1. According to the weight percentage composition of Cu<0.1%, Mn<0.1%, Si<0.25%, Fe<0.4%, Mg: 2.2%-2.4%, Cr: 0.15%-0.25%, Zn<0.1% and the balance Al, weigh the smelting raw materials and smelt them to obtain an aluminum alloy solution;

[0018] 2. The aluminum alloy solution is melt-casted to obtain an aluminum alloy ingot, which is then homogenized, annealed, and hot-rolled to a thickness of 5.0 mm to obtain a hot-rolled billet, which is then cold-rolled to a thickness of 1.5 to 2.5 mm to obtain a cold-rolled coil;

[0019] 3. The cold rolled coil is subjected to air cushion annealing, and then the annealed coil is handed over to a shearing machine to be sheared to corresponding specifications to obtain a high elongation 5052 aluminum alloy sheet for deep drawing, thus completing the manufacturing method.

[0020] Specific embodiment 2: This embodiment is different from the specific embodiment 1 in that in step 1, the smelting raw materials are weighed and smelted according to the weight percentage composition of Cu<0.1%, Mn<0.1%, Si<0.25%, Fe<0.4%, Mg: 2.3%, Cr: 0.2%, Zn<0.1% and the balance Al. The other steps and parameters are the same as those of the specific embodiment 1.

[0021] Specific embodiment 3: This embodiment is different from specific embodiment 1 in that the melting and casting in step 2 is performed according to the current melting and casting process of 5052, the casting temperature is 660℃~700℃, the melting and casting speed is 50~60mm / min, the casting cooling water pressure is 0.003~0.1MPa, and the cooling water temperature is 20℃~26℃. The other steps and parameters are the same as those in specific embodiment 1.

[0022] Specific embodiment 4: This embodiment is different from specific embodiment 3 in that the melting and casting in step 2 is performed according to the current melting and casting process of 5052, the casting temperature is 680°C, the melting and casting speed is 55mm / min, the casting cooling water pressure is 0.008MPa, and the cooling water temperature is 24°C. The other steps and parameters are the same as those in specific embodiment 3.

[0023] Specific implementation method 5: This implementation method is different from specific implementation method 1 in that the homogenization annealing in step 2 is: the furnace gas is kept at a constant temperature of 470°C, and the furnace is taken out after heating for 15 hours. The other steps and parameters are the same as those in specific implementation method 1.

[0024] Specific implementation method 6: This implementation method is different from the specific implementation method 1 in that step 2 is cold-rolled to a thickness of 2.0 mm. The other steps and parameters are the same as those of the specific implementation method 1.

[0025] Specific implementation method 7: This implementation method is different from specific implementation method 1 in that the air cushion annealing in step 3: the furnace gas temperature is 455-460°C, the speed is 20m / min-35m / min, the pure stretching, and the elongation is 0.02%. Other steps and parameters are the same as those in specific implementation method 1.

[0026] Specific embodiment eight: This embodiment differs from specific embodiment seven in that the air cushion annealing in step three: furnace gas constant temperature 458°C, speed 30m / min, pure stretching, elongation 0.02%. Other steps and parameters are the same as those in specific embodiment seven.

[0027] The beneficial effects of the present invention are verified by the following examples:

[0028] Example:

[0029] A method for manufacturing a high-elongation 5052 aluminum alloy sheet for deep drawing is carried out according to the following steps:

[0030] 1. According to the weight percentage composition of Cu<0.1%, Mn<0.1%, Si<0.25%, Fe<0.4%, Mg: 2.2%-2.4%, Cr: 0.15%-0.25%, Zn<0.1% and the balance Al, weigh the smelting raw materials and smelt them to obtain an aluminum alloy solution;

[0031] 2. The aluminum alloy solution is melt-casted to obtain an aluminum alloy ingot, which is then homogenized, annealed, and hot-rolled to a thickness of 5.0 mm to obtain a hot-rolled billet, which is then cold-rolled to a thickness of 1.5 to 2.5 mm to obtain a cold-rolled coil;

[0032] 3. The cold rolled coil is subjected to air cushion annealing, and then the annealed coil is handed over to a shearing machine to be sheared to corresponding specifications to obtain a high elongation 5052 aluminum alloy sheet for deep drawing, thus completing the manufacturing method.

[0033] The smelting and casting described in step 2 of this embodiment are performed according to the current 5052 smelting and casting process, with a casting temperature of 660°C to 700°C, a smelting and casting speed of 50 to 60 mm / min, a casting cooling water pressure of 0.003 to 0.1 MPa, and a cooling water temperature of 20°C to 26°C.

[0034] The homogenization annealing in step 2 of this embodiment is as follows: the furnace temperature is set at 470° C. and the sample is heated for 15 hours before being taken out of the furnace.

[0035] The air cushion annealing in step 3 of this embodiment: the furnace temperature is 455-460° C., the speed is 20 m / min-35 m / min, the pure stretching has an elongation of 0.02%.

[0036] In this embodiment, the annealed coil is delivered to a shearing machine and sheared to corresponding specifications to obtain a high elongation 5052 aluminum alloy plate for deep drawing. During shearing, a sample is taken from the outer ring of the coil, and the test piece is numbered 1; a sample is taken from the middle, and the test piece is numbered 2; a sample is taken from the tail, and the test piece is numbered 3. The results of the mechanical property test are shown in Table 1. It can be seen that the high elongation 5052 aluminum alloy plate for deep drawing obtained in this embodiment meets the national standard GB / T3880.1-2012, which requires a tensile strength of 170-215N / mm 2 , yield strength ≥65N / mm 2 The elongation is ≥16%, and the elongation can reach more than 25%. At the same time, the yield strength is below 90MPa, which is conducive to deep drawing and ensures that there is no crack at a punching height of 200mm.

[0037] Table 1 Mechanical properties test results of 5052 aluminum alloy plate

[0038]

[0039] The high elongation 5052 aluminum alloy sheet for deep drawing obtained in this embodiment is photographed with a 100x polarized light in the longitudinal direction. Figure 1 As shown, it can be seen that the grains are small and uniform.

[0040] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments, or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A method for manufacturing a high elongation 5052 aluminum alloy sheet for deep drawing, characterized in that It proceeds as follows:

1. According to the weight percentage composition of Cu<0.1%, Mn<0.1%, Si<0.25%, Fe<0.4%, Mg: 2.2%-2.4%, Cr: 0.15%-0.25%, Zn<0.1% and the balance Al, weigh the smelting raw materials and smelt them to obtain an aluminum alloy solution; 2. The aluminum alloy solution is melt-casted to obtain an aluminum alloy ingot, which is then homogenized, annealed, and hot-rolled to a thickness of 5.0 mm to obtain a hot-rolled billet, which is then cold-rolled to a thickness of 1.5 to 2.5 mm to obtain a cold-rolled coil; 3. The cold rolled coil is subjected to air cushion annealing, and then the annealed coil is handed over to a shearing machine to be sheared to corresponding specifications to obtain a high elongation 5052 aluminum alloy sheet for deep drawing, thus completing the manufacturing method.

2. The method for manufacturing a high elongation 5052 aluminum alloy sheet for deep drawing according to claim 1, characterized in that In step 1, the smelting raw materials are weighed and smelted according to the weight percentage composition of Cu<0.1%, Mn<0.1%, Si<0.25%, Fe<0.4%, Mg: 2.3%, Cr: 0.2%, Zn<0.1% and the balance Al.

3. The method for manufacturing a high elongation 5052 aluminum alloy sheet for deep drawing according to claim 1, characterized in that The melting and casting in step 2 is performed according to the current melting and casting process of 5052, with a casting temperature of 660°C to 700°C, a melting and casting speed of 50 to 60 mm / min, a casting cooling water pressure of 0.003 to 0.1 MPa, and a cooling water temperature of 20°C to 26°C.

4. The method for manufacturing a high elongation 5052 aluminum alloy sheet for deep drawing according to claim 3, characterized in that The smelting and casting in step 2 are performed according to the current 5052 smelting and casting process, with a casting temperature of 680°C, a smelting and casting speed of 55mm / min, a casting cooling water pressure of 0.008MPa, and a cooling water temperature of 24°C.

5. The method for manufacturing a high elongation 5052 aluminum alloy sheet for deep drawing according to claim 1, characterized in that Homogenization annealing in step 2: the furnace temperature is set at 470°C and the furnace is taken out after heating for 15 hours.

6. The method for manufacturing a high elongation 5052 aluminum alloy sheet for deep drawing according to claim 1, characterized in that Step 2: Cold rolling to a thickness of 2.0 mm.

7. The method for manufacturing a high elongation 5052 aluminum alloy sheet for deep drawing according to claim 1, characterized in that The air cushion annealing in step 3: the furnace temperature is 455-460° C., the speed is 20 m / min-35 m / min, the pure stretching has an elongation of 0.02%.

8. The method for manufacturing a high elongation 5052 aluminum alloy sheet for deep drawing according to claim 7, characterized in that The air cushion annealing in step 3: the furnace temperature is 458° C., the speed is 30 m / min, the pure stretching, and the elongation is 0.02%.

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