An aluminum alloy plate for engraving and its production method

Abstract

The present invention belongs to the technical field of aluminum alloy processing, and discloses an aluminum alloy plate for engraving. The aluminum alloy plate is processed from chemical components by the following mass percentages: Si 0.6 - 1.6%, Fe ≤ 0.7%, Cu 0.1 - 0.5%, Mn 0.6 - 1.2%, Mg 1.0 - 1.3%, Cr ≤ 0.05%, Zn ≤ 0.2%, Ti ≤ 0.05%, and the balance is Al. The aluminum alloy plate for engraving of the present invention can achieve a tensile strength of 180 Mpa and an elongation rate of ≥ 16% for the obtained H112 - state aluminum alloy plate by adjusting the contents of silicon, manganese, and magnesium components. It is 2 - 3 times the elongation rate of the existing aluminum alloy plates for engraving, which not only ensures the high - strength performance required for the aluminum alloy plate but also improves the elongation rate, helping to improve the formability and bending performance of the product.

Description

Technical Field

[0001] The present invention belongs to the technical field of aluminum alloy processing, and particularly relates to an aluminum alloy plate for engraving and a production method thereof. Background Art

[0002] Engraved aluminum plates are widely used in furniture and home decoration due to their advantages such as light weight, high rigidity, good weather resistance and welding performance, excellent anti-pollution performance, and a wide range of color options. The commonly used aluminum alloys for engraved plates are Series 1 (such as 1100-H24 state), Series 3 (such as 3003-H24 state), and Series 5 (such as 5052-H112 state). However, the strength of 1100 aluminum alloy is low, the product service life is short, and the application range is limited; the elongation is low, so the formability is poor, and it is easy to deform and crack. For 3003 aluminum alloy and 5052 aluminum alloy, although the strength performance is improved, the elongation is still low. The low elongation makes the stamping and bending properties of the material poor, which is not conducive to the forming process of the product. Therefore, it is necessary to adjust the alloy composition of the existing engraved aluminum plates to improve their elongation. Summary of the Invention

[0003] Aiming at the technical problems of low strength and low elongation of the existing engraved aluminum plates, one of the purposes of the present invention is to provide an aluminum alloy plate for engraving. By adjusting the contents of silicon, manganese, and magnesium components, both the high strength performance of the aluminum alloy plate is ensured and the elongation is improved.

[0004] The second purpose of the present invention is to provide a production method of an aluminum alloy plate for engraving. Using process waste as raw materials, by adjusting the refining and filtering processes of the aluminum liquid, impurities and dross in the aluminum liquid are ensured to be removed, and the purity of the aluminum liquid is guaranteed; at the same time, the casting process is adjusted to ensure normal starting casting and eliminate defects such as aluminum leakage and cracks that cause casting failure.

[0005] To achieve the above purposes, the present invention adopts the following technical solutions:

[0006] The present invention provides an aluminum alloy plate for engraving, which is processed from the following chemical components by mass percentage: Si 0.6 - 1.6%, Fe ≤ 0.7%, Cu 0.1 - 0.5%, Mn 0.6 - 1.2%, Mg 1.0 - 1.3%, Cr ≤ 0.05%, Zn ≤ 0.2%, Ti ≤ 0.05%, and the balance is Al. For the aluminum alloy plate for engraving of the present invention, by adjusting the contents of silicon, manganese, and magnesium components, the tensile strength of the H112 state aluminum alloy plate can reach 180 Mpa, and the elongation can reach ≥ 16% (2 - 3 times the elongation of the existing engraved plate). Both the high strength performance required for the product is ensured and the elongation is improved, which helps to improve the formability and bending performance of the product.

[0007] The present invention also provides a production method of the above aluminum alloy plate for engraving, including the following steps:

[0008] a. Melting: Using process waste as raw materials, proportion the ingredients according to the above chemical composition content. Add the raw materials into a reverberatory furnace for melting. The melting temperature is 720 - 760 °C. After all the raw materials in the furnace are melted, stir to remove the floating slag to obtain aluminum alloy liquid.

[0009] b. Primary refining: Conduct primary refining on the aluminum alloy liquid obtained in step a. The primary refining temperature is 720 - 760 °C, and the primary refining time is 10 - 20 min.

[0010] c. Secondary refining: After primary refining, skim the slag and transfer the furnace. Pour the aluminum alloy liquid into a holding furnace and conduct secondary refining in the holding furnace. The secondary refining temperature is 720 - 760 °C, and the secondary refining time is 30 - 40 min.

[0011] d. Filtration and online degassing: After secondary refining, skim the slag, let it stand in the holding furnace for 20 - 30 min, and then conduct primary filtration, secondary filtration, deep bed filtration, and online degassing on the standing aluminum alloy liquid in sequence.

[0012] e. Casting: Use the direct chill casting process to cast the filtered aluminum alloy liquid into aluminum alloy flat ingots. The casting conditions are as follows: The casting temperature is 700 - 720 °C, the cooling water flow rate is 100 - 280 m 3 / h, and the casting speed is 40 - 46 mm / min; When the length of the cast flat ingot is greater than 80 mm, adjust to the normal casting process. The casting conditions are as follows: The casting temperature is 700 - 730 °C, the cooling water flow rate is 200 - 300 m 3 / h, and the casting speed is 45 - 50 mm / min.

[0013] f. Milling: Mill the aluminum alloy flat ingot. The single - side milling amount of the large surface is 8 - 12 mm, and the single - side milling amount of the small side is 5 - 8 mm.

[0014] g. Homogenization heat treatment: Place the milled aluminum alloy flat ingot in a heating furnace for homogenization treatment. Control the heat treatment temperature at 490 - 510 °C, and the holding time is 4 - 6 h.

[0015] h. Rough rolling: Rough roll the aluminum alloy flat ingot with an out - of - furnace temperature of 455 - 470 °C after heat treatment through 21 - 25 passes to roll it into an aluminum plate with a thickness of 35 mm.

[0016] i. Finish rolling: Roll the aluminum plate after rough rolling through 3 passes to roll it into an aluminum plate with a thickness of 7 - 10 mm. The entry rolling temperature is 405 - 415 °C, and the exit rolling temperature is 310 - 325 °C.

[0017] j. Packaging: After hot rolling, the aluminum plate is coiled into an aluminum coil by a coiler and packaged by transverse shearing and slicing.

[0018] In a technical solution, the process waste used in the present invention is the head and tail waste or edge waste cut off during the production of 4017 aluminum alloy plates, 5052 aluminum alloy plates and 5083 aluminum alloy plates. The addition ratio of the head and tail waste or edge waste cut off during the production of the three aluminum alloy plates is 50-60%, 35-45% and 2-8%. The components in the head and tail waste or edge waste cut off during the production of the used 5052 aluminum alloy plate are: Si≤0.25%, Fe≤0.40%, Cu≤0.1%, Mn≤0.1%, Mg 2.2-2.8%, Cr 0.15-0.35%, Zn≤0.10%, Ti≤0.05%, and the balance is Al; the components in the head and tail waste or edge waste cut off during the production of the used 4017 aluminum alloy plate are: Si 0.6-1.6%, Fe 0.4-0.7%, Cu 0.1-0.5%, Mn 0.6-1.2%, Mg 0.1-0.5%, Cr≤0.05%, Zn≤0.2%, Ti≤0.05%, and the balance is Al; the components in the head and tail waste or edge waste cut off during the production of the used 5083 aluminum alloy plate are Si≤0.4%, Fe≤0.4%, Cu≤0.1%, Mn 0.4-1.0%, Mg 4-4.9%, Cr 0.05-0.25%, Zn≤0.25%, Ti≤0.15%, and the balance is Al.

[0019] In a technical solution, the precision of the primary filtration described in step d is 40 ppi, and the precision of the secondary filtration is 50 ppi.

[0020] In a technical solution, the online degassing described in step d uses high-purity argon. The rotation speed of the rotating nozzle of the degassing box is 300-400 r / min. After online degassing, the hydrogen content in every 100 g of aluminum alloy liquid is controlled to be ≤0.15 ml.

[0021] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0022] For the aluminum alloy plate for engraving of the present invention, by adjusting the contents of silicon, manganese and magnesium, the tensile strength of the obtained H112 state aluminum alloy plate can reach 180 Mpa, and the elongation can reach ≥16%, which is 2-3 times that of the existing engraving plate. It not only ensures the high strength performance of the aluminum alloy plate, but also improves the elongation, which helps to improve the formability and bending performance of the product. In addition, compared with the 5052 alloy used in the current engraving plate, the aluminum alloy composition of the present invention increases the manganese content and decreases the magnesium content, greatly reducing the hot cracking tendency of the alloy. In addition, the manganese element can also make the internal tissue Mg5Al8 compound precipitate evenly, enabling the product to obtain excellent corrosion resistance and welding performance.

[0023] The aluminum alloy plate for engraving of the present invention uses the process waste materials of 4017 aluminum alloy plates, 5052 aluminum alloy plates and 5083 aluminum alloy plates as raw materials. Special attention needs to be paid to the refining and filtering processes of the aluminum liquid to remove impurities and dross in the aluminum liquid. The present invention adopts a refining mode of primary refining for 20 minutes in a melting furnace + secondary refining for 40 minutes in a holding furnace, and a filtering mode of primary filtering, secondary filtering and deep bed filtering. The effective slag removal efficiency can reach more than 90%, ensuring the purity of the aluminum liquid. Due to the complex raw material components, the present invention first adopts the starting casting process and then adjusts it to the normal casting process, controlling the cooling water flow rate, casting speed and casting temperature to ensure the normal starting casting and prevent defects such as aluminum leakage and cracks that cause casting failure. Detailed implementation mode

[0024] The following examples are used to illustrate the present invention, but are not used to limit the protection scope of the present invention. Unless otherwise specified, the technical means used in the examples are conventional means well-known to those skilled in the art. The test methods in the following examples are all conventional methods unless otherwise specified.

[0025] Example 1 Production of aluminum alloy plate with a thickness of 9.67 mm

[0026] a. Melting: Using the head and tail waste materials or edge waste materials cut during the production of 4017 aluminum alloy plates, 5052 aluminum alloy plates and 5083 aluminum alloy plates as raw materials, the usage amounts of the three process waste materials are 36300 Kg, 25500 kg and 2600 kg respectively. Add the raw materials to a reverberatory furnace for melting, and the melting temperature is 747 ± 2 °C. After all the raw materials in the furnace are melted, stir to remove the dross to obtain aluminum alloy liquid. During the melting process, through spectral detection, adjust the composition of the aluminum alloy liquid to meet: Si 0.916%, Fe 0.614%, Cu 0.154%, Mn 0.805%, Mg 1.146%, Cr 0.038%, Zn 0.0794%, Ti 0.028%, Al 96.2196%.

[0027] b. Primary refining: Perform primary refining on the aluminum alloy liquid obtained in step a. The primary refining temperature is 744 ± 2 °C, and the primary refining time is 20 minutes.

[0028] c. Secondary refining: After primary refining, skim the slag and transfer the furnace. Transfer the aluminum alloy liquid to a holding furnace. In the holding furnace, secondary refining is carried out by combining in-furnace automatic gas injection refining and out-of-furnace manual powder injection refining. The secondary refining temperature is 750 ± 2 °C, and the secondary refining time is 40 minutes.

[0029] d. Filtration and on-line degassing: After secondary refining, slag skimming is carried out, and it is left standing in the holding furnace for 20 minutes. The static aluminum alloy is filtered successively through primary filtration. The precision of the primary ceramic filter is 40 ppi; secondary filtration, the precision of the secondary ceramic filter is 50 ppi; deep bed filtration uses a porous medium as the filter layer. The porous medium is stacked by alumina balls and alumina grits. Generally, the filtration tonnage is <8000 tons, and the slag removal efficiency can reach more than 90%. It also has an on-line temperature measurement and heating device, which can better control the metal temperature, reduce the oxidation and hydrogen absorption of the molten aluminum; before the molten aluminum enters the on-line degassing device, aluminum-titanium-boron wire is added for grain refinement. The feeding speed of the aluminum-titanium-boron wire is 10 mm / min. The on-line degassing process uses a double-rotor high-purity argon degassing method, and the rotor speeds are 353 r / min and 357 r / min respectively. After on-line degassing, the hydrogen content in every 100 g of molten aluminum alloy liquid is controlled to be 0.104 ml.

[0030] Multiple filtrations ensure the purity of the molten aluminum alloy and guarantee the quality defect-free of the ingot without slag inclusion. In addition, the filter box has a heating and temperature-rising function, making the temperature of the molten aluminum in casting more stable and also ensuring more uniform quality of the ingot.

[0031] e. Casting: The filtered aluminum alloy liquid is cast into an aluminum alloy flat ingot by the direct-chill casting process. The casting conditions are as follows: The casting temperature is 717 ± 2 °C, the cooling water flow rate is 140 m 3 / h, and the casting speed is 40 mm / min; when the length of the cast flat ingot reaches 100 mm, it is adjusted to the normal casting process. The casting conditions are as follows: The casting temperature is 722 ± 2 °C, the cooling water flow rate is 260 m 3 / h, and the casting speed is 46 mm / min; the cast flat ingot is a wide-width ingot with a specification of 1900 mm.

[0032] The casting platform uses a numerically controlled launder (automatic liquid level control) to reduce the cold lap defect caused by uneven surface cooling of the ingot due to inconsistent liquid level height; a slag retaining ring is assembled at the diversion port of the launder, which can greatly reduce the oxide skin on the surface of the molten aluminum from being drawn into the large surface of the ingot during the casting process, improving the surface quality of the ingot.

[0033] f. Facing: The aluminum alloy flat ingot is faced. The facing amount on one side of the large surface is 10 mm, and the facing amount on one side of the small side is 5 mm, ensuring that there are no surface quality defects such as slag inclusion, crack, cold lap, and aluminum sticking mark on the ingot surface.

[0034] g. Homogenization heat treatment: The faced aluminum alloy flat ingot is placed in a heating furnace for homogenization treatment. The temperature of the heat treatment is controlled at 502 ± 2 °C, and the holding time is 5 h.

[0035] h. Rough rolling: The aluminum alloy flat ingot with an out-of-furnace temperature of 457 ± 2 °C after heat treatment is rough rolled through 21 passes to be rolled into an aluminum plate with a thickness of 35 mm. The reduction per pass is shown in Table 1.

[0036] Reduction per pass in rough rolling, shown in Table 1

[0037]

[0038]

[0039] i. Finish rolling: The aluminum plate after rough rolling is rolled through 3 passes to produce an aluminum alloy plate with a thickness of 9.67 mm. The rolling-in temperature is 410 ± 2 °C, and the final rolling temperature is 315 ± 2 °C. The processing rate per pass in finish rolling is shown in Table 2.

[0040] Processing rate per pass in finish rolling, shown in Table 2

[0041] Pass 1 2 3 Entrance thickness, mm 35.0 19.6 13.33 Exit thickness, mm 19.6 13.33 9.67 Pass reduction rate, % 44.0 31.99 27.46 Reduction amount, mm 15.4 6.27 3.66

[0042] j. Packaging: The aluminum plate after hot rolling is coiled into an aluminum coil by a coiler and then transversely cut and sliced for packaging.

[0043] Example 2: Production of an aluminum alloy plate with a thickness of 7.6 mm

[0044] a. Melting: Using the head and tail scraps or edge scraps cut during the production of 4017 aluminum alloy plates, 5052 aluminum alloy plates, and 5083 aluminum alloy plates as raw materials. The amounts of the three process scraps are 36000 Kg, 25000 g, and 2450 kg respectively. The raw materials are added to a reverberatory furnace for melting. The melting temperature is 747 ± 2 °C. After all the raw materials in the furnace are melted, the floating slag is removed by stirring to obtain aluminum alloy liquid. During the melting process, the composition of the aluminum alloy liquid is adjusted by spectral detection to meet: Si 0.9%, Fe 0.6%, Cu 0.139%, Mn 0.839%, Mg 1.089%, Cr 0.039%, Zn 0.0746%, Ti 0.025%, Al 96.2944%.

[0045] b. Primary refining: The aluminum alloy liquid obtained in step a is subjected to primary refining. The primary refining temperature is 741 ± 2 °C, and the primary refining time is 20 min.

[0046] c. Secondary refining: After primary refining, slag skimming and furnace guiding are carried out, and the aluminum alloy liquid is introduced into a holding furnace. In the holding furnace, secondary refining is carried out by combining in-furnace automatic gas injection refining and out-of-furnace manual powder injection refining. The secondary refining temperature is 746 ± 2 °C, and the secondary refining time is 40 min.

[0047] d. Filtration and on-line degassing: After secondary refining, slag skimming is carried out, and it is left standing in the holding furnace for 20 min. The static aluminum alloy is filtered successively through primary filtration, with the accuracy of the primary ceramic filter being 40 ppi; secondary filtration, with the accuracy of the secondary ceramic filter being 50 ppi; deep bed filtration uses a porous medium as the filter layer and has an on-line temperature measurement and heating device; before the molten aluminum enters the on-line degassing device, Al-Ti-B wire is added for grain refinement, with the addition speed of Al-Ti-B wire being 10 mm / min. The on-line degassing process uses a double-rotor high-purity argon degassing method, with the rotor speeds being 350 r / min and 355 r / min respectively. After on-line degassing, the hydrogen content in every 100 g of molten aluminum alloy is controlled to be 0.112 ml.

[0048] e. Casting: The filtered aluminum alloy liquid is cast into an aluminum alloy flat ingot using an ingot casting process. The casting conditions are as follows: The casting temperature is 712 ± 2 °C, the cooling water flow rate is 140 m 3 / h, and the casting speed is 40 mm / min; when the length of the cast flat ingot reaches 100 mm, it is adjusted to the normal casting process, and the casting conditions are as follows: The casting temperature is 719 ± 2 °C, the cooling water flow rate is 260 m 3 / h, and the casting speed is 46 mm / min; the cast flat ingot is a wide-width ingot with a specification of 1900 mm.

[0049] f. Milling: The aluminum alloy flat ingot is milled. The single-side milling amount of the large surface is 10 mm, and the single-side milling amount of the small side is 5 mm, ensuring that there are no surface quality defects such as slag inclusion, crack, cold lattice, and aluminum sticking mark on the ingot surface.

[0050] g. Homogenization heat treatment: The milled aluminum alloy flat ingot is placed in a heating furnace for homogenization treatment. The temperature of the heat treatment is controlled at 502 ± 2 °C, and the holding time is 5 h.

[0051] h. Rough rolling: The aluminum alloy flat ingot with an out-of-furnace temperature of 465 ± 2 °C after heat treatment is rough rolled through 23 passes to be rolled into an aluminum plate with a thickness of 35 mm. The reduction per pass is shown in Table 3.

[0052] Table 3 Reduction per pass in rough rolling

[0053] Pass 1 2 3 4 5 6 7 8 Entrance thickness, mm 647.15 624.89 602.63 577.82 549.92 518.52 483.2 477.58 Exit thickness, mm 624.89 602.63 577.82 549.92 518.52 483.2 477.58 411.96 Reduction amount, mm 22.26 22.26 24.81 27.9 31.4 35.32 5.62 65.62 Pass 9 10 11 12 13 14 15 16 Entrance thickness, mm 411.96 376.34 340.72 305.1 269.48 233.86 198.24 162.62 Exit thickness, mm 376.34 340.72 305.1 269.48 233.86 198.24 162.62 127.0 Reduction amount, mm 35.62 35.62 35.62 35.62 35.62 35.62 35.62 35.62 Pass 17 18 19 20 21 22 23 Entrance thickness, mm 127.0 109.0 94.0 82.0 70.0 58.0 46.0 Exit thickness, mm 109.0 94.0 82.0 70.0 58.0 46.0 35.0 Reduction amount, mm 18.0 15.0 12.0 12.0 12.0 12.0 11.0

[0054] i. Finish rolling: The aluminum plate after rough rolling is rolled through 3 passes to be rolled into an aluminum alloy plate with a thickness of 7.6 mm. The entry rolling temperature is 407 ± 2 °C, and the final rolling temperature is 321 ± 2 °C. The processing rate per pass in finish rolling is shown in Table 4.

[0055] Table 4 Processing rate per pass in finish rolling

[0056] Pass 1 2 3 Entrance thickness, mm 35.0 18.2 11.83 Exit thickness, mm 18.2 11.83 7.6 Pass reduction rate, % 48 35 36 Reduction amount, mm 16.8 6.37 4.23

[0057] j. Packaging: After hot rolling, the aluminum sheet is coiled into an aluminum coil by a coiler and then transversely cut and sliced for packaging.

[0058] The component comparisons of the aluminum alloy sheets of Example 1 and Example 2 with 1100 aluminum alloy sheet, 3003 aluminum alloy sheet, and 5052 aluminum alloy sheet are shown in Table 5.

[0059] Table 5 Component comparison of the aluminum alloy sheets of Example 1 and Example 2 with those of other aluminum alloy sheets for engraving

[0060]

[0061] The performance comparisons of the aluminum alloy sheets of this example and Example 2 with 1100 aluminum alloy sheet, 3003 aluminum alloy sheet, and 5052 aluminum alloy sheet are shown in Table 6.

[0062] Table 6 Performance comparison of the aluminum alloy sheet of Example 1 with those of other aluminum alloy sheets for engraving

[0063] Aluminum alloy Standard Condition Thickness / mm Tensile strength / Mpa Yield strength / mm Elongation / % 1100 National standard H24 ＞1.2-6.0 ≥110 —— ≥5 3003 National standard H24 ＞3.0-6.0 145-195 ≥115 ≥6 5052 National standard H112 ＞6.0-12.5 ≥190 ≥80 ≥7 Example 1 Measured H112 9.67 187 151 20 Example 2 Measured H112 7.6 183 144 18

[0064] As can be seen from Table 5 and Table 6, the components of the aluminum alloy sheet for engraving of the present invention are different from those of the conventional 1100 aluminum alloy sheet, 3003 aluminum alloy sheet, and 5052 aluminum alloy sheet. By adjusting the contents of silicon, manganese, and magnesium components, the tensile strength of the obtained H112 - state aluminum alloy sheet can reach 180 Mpa, which is higher than the tensile strengths of the 1100 aluminum alloy sheet, 3003 aluminum alloy sheet, and 5052 aluminum alloy sheet; the elongation can reach ≥16%, which is 2 - 3 times that of the existing aluminum alloy sheets for engraving, helping to improve the formability and bending performance of the product.

[0065] The above - mentioned embodiments are only the preferred embodiments of the present invention, which are only used to explain the present invention and do not limit the scope of the present invention. For those skilled in the art of this technology, of course, other implementation manners can be easily made by means of substitution or change according to the technical content disclosed in this specification. Therefore, all changes and improvements made on the principle of the present invention should be included within the scope of the patent application of the present invention.

Claims

1. A production method of an aluminum alloy plate for engraving, characterized in that, The following steps are involved: a. Melting: using process waste as raw material, the process waste is the head and tail waste or edge waste cut off during the production of 4017 aluminum alloy plate, 5052 aluminum alloy plate and 5083 aluminum alloy plate, and the ingredients are prepared according to the following chemical composition content in mass percentage: Si 0.6~1.6%, Fe≤0.7%, Cu 0.1~0.5%, Mn 0.6~1.2%, Mg 1.0~1.3%, Cr≤0.05%, Zn≤0.2%, Ti≤0.05%, and the balance is Al. The raw materials are added into a flame reverberatory furnace for melting at a melting temperature of 720~760℃. After all the raw materials in the furnace are melted, they are stirred to remove scum to obtain aluminum alloy liquid; b. Primary refining: the aluminum alloy liquid obtained in step a is subjected to primary refining at a temperature of 720-760° C. for a refining time of 10-20 min; c. Secondary refining: After the primary refining, the slag is removed and the furnace is guided, and the aluminum alloy liquid is guided into the static furnace for secondary refining in the static furnace. The secondary refining temperature is 720~760℃ and the secondary refining time is 30~40min. d. Filtration and online degassing: After secondary refining, the slag is removed and the aluminum alloy liquid is left to stand in a standing furnace for 20 to 30 minutes. The aluminum alloy liquid after standing is then subjected to primary filtration, secondary filtration, deep bed filtration, and online degassing in sequence; e. Casting: The filtered aluminum alloy liquid is cast into aluminum alloy flat ingots by the direct-chill casting process. The casting conditions are as follows: the casting temperature is 700 - 720 °C, the cooling water flow rate is 100 - 280 m 3 / h, and the casting speed is 40 - 46 mm / min. When the length of the cast flat ingot is greater than 80 mm, it is adjusted to the normal casting process. The casting conditions are as follows: the casting temperature is 700 - 730 °C, the cooling water flow rate is 200 - 300 m 3 / h, and the casting speed is 45 - 50 mm / min; f. Milling: Mill the aluminum alloy flat ingot, the large side single side milling amount is 8~12mm, and the small side single side milling amount is 5~8mm; g. Homogenization heat treatment: Place the aluminum alloy flat ingot after milling in a heating furnace for homogenization treatment, control the heat treatment temperature to 490~510℃, and keep it warm for 4~6h; h. Rough rolling: The aluminum alloy flat ingot with a furnace temperature of 455~470℃ after heat treatment is subjected to 21~25 rough rolling passes to be rolled into a 35mm thick aluminum plate; i. Finish rolling: The aluminum plate after rough rolling is rolled into an aluminum plate with a thickness of 7-10 mm through three passes, with a rolling temperature of 405-415°C and a final rolling temperature of 310-325°C; j. Packaging: After hot rolling, the aluminum sheet is coiled into aluminum coils by a coiler and then cut into transverse sheets for packaging.

2. The production method according to claim 1, characterized in that, The added proportions of head and tail scraps or edge scraps cut off during production of the 4017 aluminum alloy sheet, the 5052 aluminum alloy sheet, and the 5083 aluminum alloy sheet are 50-60%, 35-45%, and 2-8%, respectively.

3. The production method according to claim 1, characterized in that, The precision of the first-level filtration in step d is 40ppi, and the precision of the second-level filtration is 50ppi.

4. The production method according to claim 1, characterized in that, The online degassing described in step d uses high-purity argon gas, the rotation speed of the rotating nozzle of the degassing box is 300-400r / min, and the hydrogen content in every 100g of aluminum alloy liquid is controlled to be ≤0.15mL after online degassing.

Images