A method for producing 8006 high-strength and high-toughness single-aluminum foil with low carbon and environmental protection by continuous casting and rolling

Abstract

The application belongs to the technical field of aluminum alloy production, and particularly discloses a method for producing 8006 high-strength and high-toughness single-zero aluminum foil by continuous casting and rolling in a low-carbon and environment-friendly manner, which comprises the following steps: producing 8006 alloy cast blank by the continuous casting method, producing 1.5mm-thick blank by three continuous rolling, producing high-strength and high-toughness single-zero aluminum foil by reducing the thickness of the blank, optimizing the intermediate annealing process and reducing the cold foil rolling production pass, realizing low-carbon short-flow production, reducing the intermediate annealing temperature by optimizing the intermediate annealing process, avoiding the problem of coarse grains caused by abnormal grain growth of the Mn element in the blank during recrystallization, avoiding the material rejection caused by the influence of the mechanical properties of the finished product due to the coarse grain problem, in addition, the intermediate annealing process of the present application can realize the production of finished products only by one intermediate annealing, and the 8006 alloy aluminum foil product produced by the conventional casting and rolling blank reduces one intermediate annealing, and the production cost is reduced by about 200 yuan / ton.

Description

Technical Field

[0001] This invention belongs to the field of aluminum alloy production technology, and specifically discloses a method for producing 8006 high-strength and high-toughness single-zero aluminum foil through continuous casting and rolling in a low-carbon and environmentally friendly manner. Background Technology

[0002] Aluminum foil is increasingly used due to its excellent barrier properties, light weight, electrical and thermal conductivity, ease of processing, and recyclability, leading to a surge in manufacturing and usage. However, aluminum foil produced using conventional processes generally has a strength below 110 MPa, exhibiting poor fatigue and impact resistance, making it unsuitable for use in scenarios involving repeated bending, vibration, and impacts.

[0003] Against this backdrop, the trial production of high-strength and high-toughness aluminum foil is particularly necessary. While retaining the original advantages of ordinary aluminum foil, such as its thinness, thermal conductivity, and good barrier properties, high-strength and high-toughness aluminum foil significantly improves strength and toughness, making it more usable, material-saving, and reliable in many applications. Chinese patent CN116179816A discloses the production of 8006 alloy high-strength food-grade aluminum foil using a casting-rolling method. This production scheme requires one high-temperature homogenization annealing and one intermediate annealing. The resulting high-strength food-grade aluminum foil has a tensile strength of only 110-140 MPa, and the finished product's mechanical properties are relatively soft, which is not conducive to market promotion and use. Chinese patent CN107058771A uses cast-rolled billets to produce 8006 alloy double-zero foil. Since the thickness of the cast-rolled billet is between 6.0-7.0 mm, two intermediate annealing processes are also required. Overall, this results in more rolling passes, more intermediate annealing processes, higher production energy consumption, and higher production costs. Chinese patent CN110484755A uses continuously cast and rolled billets to produce high-strength household aluminum foil made of 8006 alloy. Although the high-strength food aluminum foil produced has a tensile strength ≥125MPa, the production method requires one intermediate annealing and one intermediate tempering. The two annealing processes result in high production costs and long production time. In addition, the production method cannot use a large proportion of recycled aluminum waste, and thus fails to achieve the low-carbon and environmentally friendly level of this patent. Summary of the Invention

[0004] To address the problems in the background art, this invention discloses a method for producing 8006 high-strength, high-toughness single-zero aluminum foil in a low-carbon and environmentally friendly manner through continuous casting and rolling. The method uses continuous casting to produce 8006 alloy billets, and then uses three continuous rolling processes to produce 1.5mm thick billets. By reducing the billet thickness, optimizing the intermediate annealing process, and reducing the number of cold foil rolling passes, high-strength, high-toughness single-zero aluminum foil is produced, achieving low-carbon and short-process production.

[0005] To achieve the above-mentioned objectives, the present invention adopts the following technical solution: A method for producing 8006 high-strength, high-toughness single-zero aluminum foil using continuous casting and rolling in a low-carbon and environmentally friendly manner, specifically includes the following steps: S1. Smelting: 86%–95% by mass of recycled aluminum scrap and 5%–14% by mass of molten electrolytic aluminum are placed in a smelting furnace for remelting to prepare molten aluminum. After melting, an original sample is taken for testing. Based on the test results, quick-dissolving silicon, aluminum-iron alloy, titanium agent, and manganese agent are added to adjust the alloy composition to meet the requirements. The mass percentages of each component are: Si: 0.20–0.40%, Fe: 1.2–1.3%, Cu: ≤0.02%, Mn: 0.60–0.70%, Mg ≤0. 0.10%, Zn≤0.02%, Ti:0.02%-0.03%, total impurity elements≤0.03%, balance is aluminum. Ensure the melt is thoroughly stirred. Use a refining machine for primary refining and local stirring. After primary refining, take samples for testing. If the composition is qualified, carry out secondary refining. Only argon gas is introduced as the refining gas for secondary refining. After secondary refining, let it stand for 10 minutes and then perform slag removal. After slag removal, let it stand for 30-40 minutes before starting the furnace. The furnace temperature is 715-725℃. S2. Online treatment of melt: After the furnace is started, the aluminum melt flows smoothly into the guide flow channel. Aluminum titanium boron wire grain refiner is added to the aluminum melt at a uniform speed. The refined aluminum melt enters the degassing box and plate filter box in sequence for degassing and filtration. After degassing and filtration, the aluminum melt flows directly into the front box after being filtered by the deep bed filter box. S3, Continuous casting: The temperature of the melt in the front box is 680℃~690℃. The aluminum melt in the front box flows into the casting cavity of the casting machine through the casting nozzle. The aluminum melt solidifies in the casting cavity to form a billet and exits the plate. The casting speed is 6.0~6.5m / min and the billet thickness is 19mm. S4. Continuous rolling: The billet enters the three-stand rolling mill for rolling. The billet exit thickness of the first stand of the three-stand rolling mill is 7.0-8.0 mm, the billet exit thickness of the second stand of the three-stand rolling mill is 3.0-4.0 mm, and the billet exit thickness of the third stand of the three-stand rolling mill is 1.5-2.0 mm. The billet exiting the third stand of the three-stand rolling mill is coiled into a coil. S5. Intermediate annealing: The continuously rolled billet is suspended in the annealing furnace. The furnace temperature is raised to 300-350℃ after 4 hours and held for 20-25 hours. The furnace temperature is then lowered to 170℃ and held for 2 hours before being taken out of the furnace. S6. Cold rolling: The billet after intermediate annealing is rolled in 3 passes on a cold rolling mill to obtain a cold rolled coil with a thickness of 0.25 mm. S7. Longitudinal shearing: The 0.25mm thick cold-rolled coil is sheared, and the width tolerance of the material after shearing is less than ±1mm, and there is no aluminum powder accumulation on the edge. S8. Foil rolling: The coil after longitudinal shearing is rolled in an aluminum foil rolling mill in 3 to 4 passes to obtain a finished product with a thickness of 0.012-0.02mm. The last pass requires double rolling, and the finished product is single-sided bright aluminum foil. S9. Finished product slitting: After the foil rolling in step S8, the finished product is transferred to a vertical slitting machine and slitting is done by double take-off and peeling. The slitting misalignment is less than 0.5mm. After slitting, the finished product is placed directly into the suspended frame for suspension. S10. Finished product annealing: After slitting, the finished product is loaded into the annealing frame according to the framing requirements and placed in the annealing furnace. After 4 hours, the annealing furnace is heated to 200-250℃ and held for 20 hours. Then, when the furnace temperature is lowered to 170℃, the product is taken out of the furnace and allowed to cool naturally to room temperature. The tensile strength of the finished aluminum foil is tested to be 130MPa-150MPa, the yield strength is 110-130MPa, and the elongation is ≥3%.

[0006] Furthermore, in the method for producing 8006 high-strength and high-toughness single-zero aluminum foil in a low-carbon and environmentally friendly manner through continuous casting and rolling, in step S1, when adding materials, recycled aluminum waste is first added to the smelting furnace, and after the recycled aluminum waste is melted, electrolytic aluminum liquid is added to it. When adding electrolytic aluminum liquid, electromagnetic stirring needs to be turned on to promote the flow of aluminum liquid and make the composition uniform.

[0007] Furthermore, in the method for producing 8006 high-strength and high-toughness single-zero aluminum foil in a low-carbon and environmentally friendly manner through continuous casting and rolling, the temperature inside the deep bed filter box is 720-730℃ in step S2.

[0008] Furthermore, in the method for producing 8006 high-strength and high-toughness single-zero aluminum foil in a low-carbon and environmentally friendly manner through continuous casting and rolling, the hydrogen content in the aluminum melt in the front box in step S3 is ≤0.12mg / 100gAl.

[0009] Furthermore, in the method for producing 8006 high-strength and high-toughness single-zero aluminum foil in a low-carbon and environmentally friendly manner through continuous casting and rolling, the temperature of the slab exiting the third stand of the three-roll mill is 200-230℃ in step S4.

[0010] Furthermore, in the method for producing 8006 high-strength and high-toughness single-zero aluminum foil in a low-carbon and environmentally friendly manner through continuous casting and rolling, in step S4, all three stands of the three-stand rolling mill need to be cooled and lubricated with emulsion, and the emulsion temperature is controlled at 30-35℃.

[0011] Furthermore, in the method for producing 8006 high-strength and high-toughness single-zero aluminum foil in a low-carbon and environmentally friendly manner through continuous casting and rolling, in step S5, positive pressure blowing must be performed throughout the intermediate annealing process.

[0012] Furthermore, in the method for producing 8006 high-strength and high-toughness single-zero aluminum foil in a low-carbon and environmentally friendly manner through continuous casting and rolling, in step S10, negative pressure degreasing is performed throughout the annealing process of the finished product.

[0013] Compared with the prior art, the beneficial effects of the present invention are: This invention relates to a method for producing 8006 high-strength, high-toughness single-zero aluminum foil using continuous casting and rolling in a low-carbon and environmentally friendly manner. The method involves producing 8006 alloy billets using continuous casting and rolling. The billets produced by this production line undergo a solidification and remelting process during the continuous casting stage. This process can eliminate segregation, refine grains, and ensure a more uniform composition and microstructure. In addition, the coil temperature is higher after three consecutive rolling processes, which can eliminate internal stress in the microstructure and facilitate subsequent rolling processes. This invention relates to a method for producing 8006 high-strength, high-toughness single-zero aluminum foil in a low-carbon and environmentally friendly manner through continuous casting and rolling. By optimizing the intermediate annealing process and reducing the intermediate annealing temperature, the method avoids abnormal grain growth during the recrystallization of Mn elements in the billet, which leads to coarse grain problems and prevents the mechanical properties of the finished product from being affected by coarse grain problems, thus avoiding material scrapping. This invention relates to a method for producing 8006 high-strength, high-toughness single-zero aluminum foil using continuous casting and rolling in a low-carbon and environmentally friendly manner. The intermediate annealing process of this scheme can achieve the production of finished products with only one intermediate annealing, which reduces the intermediate annealing process by about 200 yuan / ton compared with the conventional casting and rolling billet production of 8006 alloy aluminum foil products. This invention relates to a method for producing 8006 high-strength, high-toughness single-zero aluminum foil using continuous casting and rolling in a low-carbon and environmentally friendly manner. By optimizing the alloy composition and setting the content of Fe, Si, Mg, and Mn elements, it ensures that the problem of excessive alloy composition due to the use of a large proportion of recycled aluminum waste will not occur, thus preventing the material from being scrapped. This invention relates to a method for producing 8006 high-strength and high-toughness single-zero aluminum foil using continuous casting and rolling in a low-carbon and environmentally friendly manner. By optimizing the alloy composition and intermediate annealing process, the finished aluminum foil is rolled in a double-layer process without any dark or bright spots. At the same time, the quality of the dark side is more delicate, with no coarse grain patterns, which is convenient for downstream customers to print and use in composite applications. Detailed Implementation

[0014] The present invention will be further explained and illustrated below with reference to embodiments. However, this should not be construed as limiting the scope of protection of the present invention. The purpose of disclosing the present invention is to protect all technical improvements within the scope of the present invention. Example 1

[0015] A method for producing 8006 high-strength, high-toughness single-zero aluminum foil using continuous casting and rolling in a low-carbon and environmentally friendly manner, comprising the following specific steps: S1. Smelting: 86.31% recycled aluminum scrap and 13.69% molten electrolytic aluminum are remelted in a smelting furnace to prepare molten aluminum. During charging, the recycled aluminum scrap is added to the furnace first, and after it melts, the molten electrolytic aluminum is added. When adding the molten aluminum, an electromagnetic stirrer needs to be turned on to promote the flow of the aluminum and ensure uniform composition. After melting, an original sample is taken for testing. Based on the test results, quick-dissolving silicon, aluminum-iron alloy, titanium agent, and manganese agent are added to adjust the alloy composition to meet the requirements. The mass percentages of each component are: Si: 0.22%, Fe: 1.21%. Cu: ≤0.017%, Mn: 0.61%, Mg: 0.09%, Zn: 0.01%, Ti: 0.023%, total impurity elements ≤0.03%, balance is aluminum. After adding iron, quick-dissolving silicon and titanium, ensure that the melt is stirred thoroughly. Use a refining machine for primary refining and local stirring. After primary refining, take samples for testing. After the composition is qualified, carry out secondary refining. Only argon gas is introduced as the refining gas for secondary refining. After secondary refining, let stand for 10 minutes and then perform slag removal. After slag removal, let stand for 32 minutes and then start the furnace. The furnace temperature is 716℃. S2. Online treatment of melt: After the furnace is started, the aluminum melt flows smoothly into the guide channel. Aluminum titanium boron wire grain refiner is added to the aluminum melt at a uniform speed. The refined aluminum melt enters the degassing box and plate filter box in sequence for degassing and filtration. After degassing and filtration, the aluminum melt flows directly into the front box after being filtered by the deep bed filter box. The temperature in the deep bed filter box is 720-730℃. S3, Continuous casting: The temperature of the melt in the front box is set to 681℃. The hydrogen content in the aluminum melt in the front box is ≤0.12mg / 100gAl. The aluminum melt in the front box flows into the casting cavity of the casting machine through the casting nozzle. The aluminum melt solidifies in the casting cavity to form a billet and exits the plate. The casting speed is 6.1m / min and the billet thickness is 19mm. S4. Continuous Rolling: The slab enters the three-stand rolling mill for rolling. All three stands of the three-stand rolling mill need to be cooled and lubricated with emulsion. The emulsion temperature is 30-35℃. The slab exit thickness of the first stand of the three-stand rolling mill is 7.2mm, the slab exit thickness of the second stand of the three-stand rolling mill is 3.2mm, and the slab exit thickness of the third stand of the three-stand rolling mill is 1.6mm. The temperature of the slab exiting the third stand of the three-stand rolling mill is 200-230℃. The slab exiting the third stand of the three-stand rolling mill is coiled. S5. Intermediate annealing: The continuously rolled billet is suspended in the annealing furnace. The furnace temperature is raised to 345℃ after 4 hours and held for 25 hours. Then the furnace temperature is lowered to 170℃ and held for 2 hours before being taken out of the furnace. Positive pressure blowing is performed throughout the intermediate annealing process. S6. Cold rolling: The billet after intermediate annealing is rolled in 3 passes on a cold rolling mill to obtain a 0.25mm thick cold-rolled coil, with a finished thickness difference of ≤±2.5%; S7. Longitudinal shearing: The cold-rolled coil with a thickness of 0.25mm is sheared. The width tolerance of the material after shearing is less than ±1mm, and there should be no aluminum powder accumulation on the edge. S8. Foil Rolling: The roll after longitudinal shearing is rolled in an aluminum foil rolling mill in 4 passes to obtain a finished product with a thickness of 0.013mm. The last pass double-rolls a single-sided bright aluminum foil product. The finished aluminum foil has no dark or bright spots, no roller marks, and no visible oil spots. S9. Finished product slitting: After foil rolling, the finished product is transferred to a vertical slitting machine for double-wrap single-sheet slitting. The slitting misalignment is less than 0.5mm. After slitting, the finished product is directly placed into the suspended material rack frame for suspension. S10. Finished product annealing: After the material is cut, the cut material is loaded into the annealing frame according to the framing requirements and placed in the annealing furnace. The annealing furnace is heated to 220℃ at a uniform rate for 4 hours and held for 20 hours. Then, when the furnace temperature is reduced to 170℃, the material is taken out of the furnace and allowed to cool naturally to room temperature. The entire process of finished product annealing is performed with negative pressure degreasing. The tensile strength of the finished aluminum foil is tested to be 148MPa, the yield strength is 125MPa, and the elongation is 3.5%. Example 2

[0016] The specific steps of the continuous casting and rolling method for producing 8006 high-strength, high-toughness single-zero aluminum foil in a low-carbon and environmentally friendly manner are as follows: S1. Smelting: 90.55% recycled aluminum scrap and 9.45% molten electrolytic aluminum are remelted in a smelting furnace to prepare molten aluminum. During charging, the recycled aluminum scrap is added to the furnace first, and after it melts, the molten electrolytic aluminum is added. When adding the molten aluminum, an electromagnetic stirrer needs to be turned on to promote the flow of the molten aluminum and ensure uniform composition. After melting, an original sample is taken for testing. Based on the test results, quick-dissolving silicon, aluminum-iron alloy, titanium agent, and manganese agent are added to adjust the alloy composition to meet the requirements. The mass percentages of each component are: Si: ≤0.34%, Fe: 1.28%. The composition is as follows: Cu: 0.011%, Mn: 0.69%, Mg: 0.08%, Zn: 0.01%, Ti: 0.029%, total impurity elements ≤ 0.03%, balance is aluminum. After adding iron, quick-dissolving silicon and titanium, ensure that the melt is stirred thoroughly. Use a refining machine for primary refining and local stirring. After primary refining, take samples for testing. After the composition is qualified, carry out secondary refining. Only argon gas is introduced as the refining gas for secondary refining. After secondary refining, let stand for 10 minutes and then perform slag removal. After slag removal, let stand for 40 minutes and then start the furnace. The furnace start-up temperature is 724℃. S2. Online treatment of melt: After the furnace is started, the aluminum melt flows smoothly into the guide channel. Aluminum titanium boron wire grain refiner is added to the aluminum melt at a uniform speed. The refined aluminum melt enters the degassing box and plate filter box in sequence for degassing and filtration. After degassing and filtration, the aluminum melt flows directly into the front box after being filtered by the deep bed filter box. The temperature in the deep bed filter box is 720-730℃. S3, Continuous casting: The temperature of the melt in the front box is set to 689℃. The hydrogen content in the aluminum melt in the front box is ≤0.12mg / 100gAl. The aluminum melt in the front box flows into the casting cavity of the casting machine through the casting nozzle. The aluminum melt solidifies in the casting cavity to form a billet and exits the plate. The casting speed is 6.4m / min and the billet thickness is 19mm. S4. Continuous Rolling: The slab enters the three-stand rolling mill for rolling. All three stands of the three-stand rolling mill need to be cooled and lubricated with emulsion. The emulsion temperature is 30-35℃. The slab exit thickness of the first stand of the three-stand rolling mill is 7.9mm, the slab exit thickness of the second stand of the three-stand rolling mill is 3.8mm, and the slab exit thickness of the third stand of the three-stand rolling mill is 1.9mm. The temperature of the slab exiting the third stand of the three-stand rolling mill is 200-230℃. The slab exiting the third stand of the three-stand rolling mill is coiled. S5. Intermediate annealing: The continuously rolled billet is suspended in the annealing furnace. After 4 hours, the furnace temperature is raised to 340℃ at a uniform rate and held for 23 hours. The furnace temperature is then lowered to 170℃ and held for 2 hours before being taken out of the furnace. Positive pressure blowing is performed throughout the intermediate annealing process. S6. Cold rolling: The billet after intermediate annealing is rolled in 3 passes on a cold rolling mill to obtain a 0.25mm thick cold-rolled coil, with a finished thickness difference of ≤±2.5%; S7. Longitudinal shearing: The cold-rolled coil with a thickness of 0.25mm is sheared. The width tolerance of the material after shearing is less than ±1mm, and there should be no aluminum powder accumulation on the edge. S8. Foil Rolling: The coil after intermediate annealing in step S6 is rolled three times in an aluminum foil rolling mill to obtain a finished product with a thickness of 0.018mm. The last pass double-rolling produces a single-sided bright aluminum foil product. The finished aluminum foil product has no dark or bright spots, no roller marks, and no visible oil spots. S9. Finished product slitting: The foil rolled finished product is transferred to a vertical slitting machine and slitting is done by double take-off and peeling. The slitting misalignment is less than 0.5mm. After slitting, the finished product material is directly placed into the frame suspended material rack for suspension. S10. Finished product annealing: After the material is cut, the cut material is loaded into the annealing frame according to the framing requirements and placed in the annealing furnace. After 4 hours, the annealing furnace is heated to 225℃ at a uniform rate and held for 20 hours. Then, when the furnace temperature is lowered to 170℃, the material is taken out of the furnace and allowed to cool naturally to room temperature. The entire process of finished product annealing is performed with negative pressure degreasing. The tensile strength of the finished aluminum foil is tested to be 142MPa, the yield strength is 125MPa, and the elongation is 6.2%. Example 3

[0017] The specific steps of the continuous casting and rolling method for producing 8006 high-strength, high-toughness single-zero aluminum foil in a low-carbon and environmentally friendly manner are as follows: S1. Smelting: 95% recycled aluminum scrap and 5% molten electrolytic aluminum are remelted in a smelting furnace to prepare molten aluminum. During charging, the recycled aluminum scrap is added to the furnace first, and after it melts, molten electrolytic aluminum is added. When adding the molten aluminum, an electromagnetic stirrer needs to be turned on to promote the flow of the molten aluminum and ensure uniform composition. After melting, an original sample is taken for testing. Based on the test results, quick-dissolving silicon, aluminum-iron alloy, titanium agent, and manganese agent are added to adjust the alloy composition to meet the requirements. The mass percentages of each component are: Si: ≤0.32%, Fe: 1.22%, Cu ... 0.009%, Mn: 0.62%, Mg: 0.05%, Zn: 0.011%, Ti: 0.022%, total impurity elements ≤0.03%, balance is aluminum. After adding iron, quick-dissolving silicon and titanium, ensure that the melt is stirred thoroughly. Use a refining machine for primary refining and local stirring. After primary refining, take samples for testing. After the composition is qualified, carry out secondary refining. Only argon gas is introduced as the refining gas in secondary refining. After secondary refining, let stand for 10 minutes and then perform slag removal. After slag removal, let stand for 32 minutes and then start the furnace. The furnace temperature is 721℃. S2. Online treatment of melt: After the furnace is started, the aluminum melt flows smoothly into the guide channel. Aluminum titanium boron wire grain refiner is added to the aluminum melt at a uniform speed. The refined aluminum melt enters the degassing box and plate filter box in sequence for degassing and filtration. After degassing and filtration, the aluminum melt flows directly into the front box after being filtered by the deep bed filter box. The temperature in the deep bed filter box is 720-730℃. S3, Continuous casting: The temperature of the melt in the front box is set to 682℃. The hydrogen content in the aluminum melt in the front box is ≤0.12mg / 100gAl. The aluminum melt in the front box flows into the casting cavity of the casting machine through the casting nozzle. The aluminum melt solidifies in the casting cavity to form a billet and exits the plate. The casting speed is 6.2m / min and the billet thickness is 19mm. S4. Continuous Rolling: The slab enters the three-stand rolling mill for rolling. All three stands of the three-stand rolling mill need to be cooled and lubricated with emulsion. The emulsion temperature is 30-35℃. The slab exit thickness of the first stand of the three-stand rolling mill is 7.7mm, the slab exit thickness of the second stand of the three-stand rolling mill is 3.7mm, and the slab exit thickness of the third stand of the three-stand rolling mill is 1.7mm. The temperature of the slab exiting the third stand of the three-stand rolling mill is 200-230℃. The slab exiting the third stand of the three-stand rolling mill is coiled. S5. Intermediate annealing: The continuously rolled billet is suspended in the annealing furnace. The furnace temperature is raised to 335℃ at a constant speed after 4 hours and held for 24 hours. The furnace temperature is then lowered to 170℃ and held for 2 hours before being taken out of the furnace. Positive pressure blowing is performed throughout the intermediate annealing process. S6. Cold rolling: The billet after intermediate annealing is rolled in 3 passes on a cold rolling mill to obtain a 0.25mm thick cold-rolled coil, with a finished thickness difference of ≤±2.5%; S7. Longitudinal shearing: The cold-rolled coil with a thickness of 0.25mm is sheared. The width tolerance of the material after shearing is less than ±1mm, and there should be no aluminum powder accumulation on the edge. S8. Foil Rolling: The coil after intermediate annealing in step S6 is rolled three times in an aluminum foil rolling mill to obtain a finished product with a thickness of 0.015mm. The last pass double-rolling produces a single-sided bright aluminum foil product. The finished aluminum foil product has no dark or bright spots, no roller marks, and no visible oil spots. S9. Finished product slitting: The foil rolled finished product is transferred to a vertical slitting machine and slitting is done by double take-off and peeling. The slitting misalignment is less than 0.5mm. After slitting, the finished product material is directly placed into the frame suspended material rack for suspension. S10. Finished product annealing: After the material is cut, the cut material is loaded into the annealing frame according to the framing requirements and placed in the annealing furnace. After 4 hours, the annealing furnace is heated to 230℃ at a uniform rate and held for 20 hours. Then, when the furnace temperature is lowered to 170℃, the material is taken out of the furnace and allowed to cool naturally to room temperature. The entire process of finished product annealing is performed with negative pressure degreasing. The tensile strength of the finished aluminum foil is tested to be 147MPa, the yield strength is 128MPa, and the elongation is 4.7%.

[0018] The parts of this invention not described in detail are prior art.

[0019] The embodiments selected herein for the purpose of disclosing the inventive objectives are currently considered suitable; however, it should be understood that the invention is intended to include all variations and modifications of the embodiments that fall within the scope of this concept and invention.

Claims

1. A method for producing 8006 high-strength, high-toughness single-zero aluminum foil using continuous casting and rolling, characterized in that: Specifically, the following steps are included: S1. Smelting: 86%–95% by mass of recycled aluminum scrap and 5%–14% by mass of molten electrolytic aluminum are placed in a smelting furnace for remelting to prepare molten aluminum. After melting, an original sample is taken for testing. Based on the test results, quick-dissolving silicon, aluminum-iron alloy, titanium agent, and manganese agent are added to adjust the alloy composition to meet the requirements. The mass percentages of each component are: Si: 0.20–0.40%, Fe: 1.2–1.3%, Cu: ≤0.02%, Mn: 0.60–0.70%, Mg ≤0. 0.10%, Zn≤0.02%, Ti:0.02%-0.03%, total impurity elements≤0.03%, balance is aluminum. Ensure the melt is thoroughly stirred. Use a refining machine for primary refining and local stirring. After primary refining, take samples for testing. If the composition is qualified, carry out secondary refining. Only argon gas is introduced as the refining gas for secondary refining. After secondary refining, let it stand for 10 minutes and then perform slag removal. After slag removal, let it stand for 30-40 minutes before starting the furnace. The furnace temperature is 715-725℃. S2. Online treatment of melt: After the furnace is started, the aluminum melt flows smoothly into the guide flow channel. Aluminum titanium boron wire grain refiner is added to the aluminum melt at a uniform speed. The refined aluminum melt enters the degassing box and plate filter box in sequence for degassing and filtration. After degassing and filtration, the aluminum melt flows directly into the front box after being filtered by the deep bed filter box. S3, Continuous casting: The temperature of the melt in the front box is 680℃~690℃. The aluminum melt in the front box flows into the casting cavity of the casting machine through the casting nozzle. The aluminum melt solidifies in the casting cavity to form a billet and exits the plate. The casting speed is 6.0~6.5m / min and the billet thickness is 19mm. S4. Continuous rolling: The billet enters the three-stand rolling mill for rolling. The billet exit thickness of the first stand of the three-stand rolling mill is 7.0-8.0 mm, the billet exit thickness of the second stand of the three-stand rolling mill is 3.0-4.0 mm, and the billet exit thickness of the third stand of the three-stand rolling mill is 1.5-2.0 mm. The billet exiting the third stand of the three-stand rolling mill is coiled into a coil. S5. Intermediate annealing: The continuously rolled billet is suspended in the annealing furnace. The furnace temperature is raised to 300-350℃ after 4 hours and held for 20-25 hours. The furnace temperature is then lowered to 170℃ and held for 2 hours before being taken out of the furnace. S6. Cold rolling: The billet after intermediate annealing is rolled in 3 passes on a cold rolling mill to obtain a cold rolled coil with a thickness of 0.25 mm. S7. Longitudinal shearing: The 0.25mm thick cold-rolled coil is sheared, and the width tolerance of the material after shearing is less than ±1mm, and there is no aluminum powder accumulation on the edge. S8. Foil rolling: The coil after longitudinal shearing is rolled in an aluminum foil rolling mill in 3 to 4 passes to obtain a finished product with a thickness of 0.012-0.02mm. The last pass requires double rolling, and the finished product is single-sided bright aluminum foil. S9. Finished product slitting: After the foil rolling in step S8, the finished product is transferred to a vertical slitting machine and slitting is done by double take-off and peeling. The slitting misalignment is less than 0.5mm. After slitting, the finished product is placed directly into the suspended material rack frame and placed in the air. S10. Finished product annealing: After slitting, the finished product is loaded into the annealing frame according to the framing requirements and placed in the annealing furnace. After 4 hours, the annealing furnace is heated to 200-250℃ and held for 20 hours. Then, when the furnace temperature is lowered to 170℃, the product is taken out of the furnace and allowed to cool naturally to room temperature. The tensile strength of the finished aluminum foil is tested to be 130MPa-150MPa, the yield strength is 110-130MPa, and the elongation is ≥3%.

2. The method for producing 8006 high-strength, high-toughness single-zero aluminum foil using continuous casting and rolling as described in claim 1, characterized in that, In step S1, when adding materials, the recycled aluminum scrap is first added to the smelting furnace. After the recycled aluminum scrap melts, electrolytic aluminum liquid is added to it. When adding electrolytic aluminum liquid, the electromagnetic stirrer needs to be turned on to promote the flow of aluminum liquid and make the composition uniform.

3. The method for producing 8006 high-strength, high-toughness single-zero aluminum foil using continuous casting and rolling as described in claim 1, characterized in that... In step S2, the temperature inside the deep bed filter box is 720-730℃.

4. The method for producing 8006 high-strength, high-toughness single-zero aluminum foil using continuous casting and rolling as described in claim 1, characterized in that... In step S3, the hydrogen content in the molten aluminum in the front chamber is ≤0.12mg / 100gAl.

5. The method for producing 8006 high-strength, high-toughness single-zero aluminum foil using continuous casting and rolling as described in claim 1, characterized in that... In step S4, the temperature of the slab exiting the third stand of the three-stand rolling mill is 200-230℃.

6. The method for producing 8006 high-strength, high-toughness single-zero aluminum foil using continuous casting and rolling as described in claim 1, characterized in that... In step S4, during the three-stand rolling mill, all three stands need to be cooled and lubricated with emulsion at a temperature of 30-35°C.

7. The method for producing 8006 high-strength, high-toughness single-zero aluminum foil using continuous casting and rolling as described in claim 1, characterized in that... In step S5, positive pressure purging is performed throughout the intermediate annealing process.

8. The method for producing 8006 high-strength, high-toughness single-zero aluminum foil by continuous casting and rolling in a low-carbon and environmentally friendly manner according to claim 1, is characterized in that... In step S10, negative pressure degreasing is performed throughout the annealing process of the finished product.