A method for producing aluminum alloy materials

Abstract

This invention relates to a method for producing aluminum alloy materials, comprising the following steps: Step S1, batching; Step S2, smelting; Step S3, casting; Step S4, machining; Step S5, integrated homogenization and preheating; Step S6, hot rolling; Step S7, cold rolling; Step S8, cleaning and trimming on a recoiling machine; Step S9, cleaning, solution quenching, and tension straightening on an air-cushion heat treatment unit; Step S10, coil aging. This invention optimizes the alloy composition ratio and also optimizes processes such as recoiling, cleaning and trimming, air-cushion heat treatment unit cleaning, solution quenching, tension straightening, and coil aging. Through the combination of these improvements, high-quality aluminum alloy coils and strips with excellent performance are obtained, meeting the various performance indicators of aluminum alloys used in aviation containers.

Description

Technical Field

[0001] This invention relates to the field of aluminum alloy sheet processing technology, and specifically to a method for producing aluminum alloy materials. Background Technology

[0002] Aluminum alloys are increasingly widely used in plates, strips, wires, profiles, and forgings, finding applications in machining, aerospace, rail, automotive, and construction. Al-Mg-Si aluminum alloys are heat-treatable alloys with high strength, plasticity, fracture toughness, and fatigue performance, excellent corrosion resistance, and good hot-working properties such as weldability and formability. The alloy composition, heat treatment state, and processing methods have a significant impact on the final properties and microstructure of the alloy.

[0003] Airline containers are one of the essential tools for modern high-speed freight transport. With increasing demands for aircraft weight reduction and safety, the performance requirements for materials are becoming increasingly stringent. Currently, using Al-Zn-Mg-Cu alloys to manufacture airline containers allows for weight reduction while maintaining strength, and also provides good corrosion resistance and impact toughness.

[0004] Chinese invention patent number CN109402538A [1] discloses a synchronous process for the reversion forming of naturally aged high-strength aluminum alloys. The naturally aged aluminum alloys are rapidly heated to between 150-280℃, held for 20 seconds, and stamped during the holding process, or stamped immediately after holding without cooling. This improves the formability and processing efficiency of aluminum alloys stored at room temperature for a long time while ensuring material properties. Chinese invention patent number CN106521253B [2] discloses a highly formable Al-Mg-Si alloy and its manufacturing method. This patent introduces a process method suitable for automobile body panels with excellent edge-wrapping performance and rapid hardening response during baking. Chinese invention patent number CN102808120A [3] discloses an Al-Mg-Si wrought aluminum alloy and its strengthening and toughening treatment method. Through the deformation processing of aluminum alloys, microwave heating solution treatment, deep cryogenic treatment, and aging treatment, aluminum alloys with high hardness, strength, and toughness can be obtained. Chinese invention patent number CN106967936B[4] discloses a method for preparing ultra-wide aluminum alloy thin plates for air cargo, which is produced using Al-Zn-Mg-Cu series aluminum alloys. However, the alloys produced by the above patent and the Al-Zn-Mg-Cu series alloys used in existing air containers have a high degree of alloying, making them prone to cracking during the casting process and resulting in a low casting success rate. Moreover, this Al-Zn-Mg-Cu series alloy plate undergoes many processes, which can easily lead to surface scratches and unevenness, resulting in a low yield rate.

[0005] To overcome the shortcomings of Al-Zn-Mg-Cu series aluminum alloy sheets, this invention proposes a production process for aluminum alloy coils and strips for air cargo. By controlling the alloy composition and heat treatment, high-quality aluminum alloy coils and strips with excellent mechanical strength, high corrosion resistance, and high surface properties are obtained, meeting the design requirements of air cargo, shortening the process flow, improving the production yield, and saving costs. Summary of the Invention

[0006] To address the shortcomings of existing technologies, the present invention aims to provide a method for producing aluminum alloy materials. By optimizing the production process, alloy composition design, and heat treatment process, the method improves production efficiency and enhances the stability of the production process. It effectively improves the comprehensive properties of the alloy, such as mechanical strength and corrosion resistance, while avoiding surface scratches and unevenness, thus greatly meeting the requirements for aluminum alloy materials used in air cargo.

[0007] To achieve the above objectives, the technical solution adopted by the present invention is as follows: A method for producing aluminum alloy material, comprising the following steps: Step S1, Ingredients: The chemical composition and mass percentage of the aluminum alloy material are as follows: Si 0.5~2.0% Fe ≤0.5% Mg 0.1–1.2% Cu 0.5–1.2% Ti ≤0.2% Mn 0.20~1.0% Zn ≤0.25% The rest consists of Al and unavoidable impurities; Step S2, smelting: Weigh each raw material according to the composition ratio of the aluminum alloy material in step S1, mix them; add 1-4% by weight of smelting agent, heat to 650-800℃ to melt the material, hold for 1-8 hours to obtain molten aluminum; Step S3, casting: The molten aluminum obtained in step S2 is poured and cooled to room temperature to obtain an aluminum alloy ingot. Step S4, Machining: The aluminum alloy ingot obtained in step S3 is cut off at the head and tail and milled. The amount of cutting off the head and tail is 100-800 mm, and the amount of milling is 10-30 mm per side, so as to obtain a machined aluminum alloy ingot. Step S5, Integrated Homogenization and Preheating: The machined aluminum alloy ingot is homogenized and preheated at 480-580℃ for 5-25 hours to obtain a preheated ingot. Step S6, hot rolling: The preheated ingot is hot rolled to obtain a hot-rolled coil strip with a thickness of 5-8 mm; Step S7, cold rolling: The hot-rolled coil strip is cold-rolled to obtain a cold-rolled coil strip with a thickness of 0.5 to 2.0 mm; Step S8, Rewinding machine cleaning and trimming: Clean the surface of the cold-rolled coil and trim the edges to obtain the cleaned coil. Step S9, Air-cushion heat treatment unit cleaning, solution quenching, and tension straightening: The cleaned strip is further cleaned in the cleaning section of the air-cushion heat treatment unit, and the cleaned strip is heated in the air-cushion heat treatment unit at a temperature of 550-580℃, with a quenching speed of 12-30m / min; the strip is then sent to the quenching zone for cooling, ensuring the water temperature is below 38℃; after the strip exits the furnace, it is tension straightened with a straightening amount of 1.0-1.5%, resulting in a comprehensively treated strip. Step S10, coil aging: The coil strip obtained in step S9 is heated and kept at a temperature of 160-200℃ for 2-20 hours to obtain the aluminum alloy material.

[0008] Further, the chemical composition and mass percentage of the aluminum alloy material in step S1 are as follows: Si 0.8~2.0% Fe ≤0.5% Mg 0.4–1.2% Cu 0.8–1.2% Ti ≤0.2% Mn 0.40~1.0% Zn ≤0.25% The rest consists of Al and unavoidable impurities.

[0009] Further, in step S2, each raw material is weighed according to the composition ratio of the aluminum alloy material in step S1 and mixed; 2-4% by weight of a melting flux is added, and the mixture is heated to 700-800℃ to melt the material and held for 4-8 hours to obtain molten aluminum.

[0010] Further, in step S4, the aluminum alloy ingot obtained in step S3 is subjected to head and tail trimming and milling. The head and tail trimming amount is 200-800mm, and the milling amount is 15-30mm per side, to obtain a machined aluminum alloy ingot.

[0011] Furthermore, in step S5, the machined aluminum alloy ingot is homogenized and preheated at 530-580°C for 8-25 hours to obtain a preheated ingot.

[0012] Furthermore, in step S6, the preheated ingot is hot-rolled in multiple passes, with the number of hot rolling passes being 8 to 16, to obtain hot-rolled coil strip with a thickness of 5 to 8 mm.

[0013] Furthermore, in step S7, the hot-rolled coil strip is subjected to multiple cold rolling passes, with the number of cold rolling passes being 3 to 5, to obtain a cold-rolled coil strip with a thickness of 0.5 to 2.0 mm.

[0014] Further, in step S9, the cleaned strip is further cleaned in the cleaning section of the air cushion heat treatment unit, and the cleaned strip is heated in the air cushion heat treatment unit at a heating temperature of 560-575℃, with a quenching speed of 16-30m / min; then the strip is sent to the quenching zone for cooling, ensuring the water temperature is below 38℃; after the strip exits the furnace, it is stretched and straightened with a stretching and straightening amount of 1.2-1.5%, resulting in a comprehensively treated strip.

[0015] Furthermore, in step S9, the quenching zone has nozzles at both the top and bottom, and water cooling is selected. The coiled strip is cooled by industrial plasma water sprayed from the pressure nozzles. The water spray pressure is 0.01 to 1 MPa, ensuring that the water temperature is below 38°C. When one end of the strip enters the quenching zone first, the water temperature is set to be below 30°C. After the strip exits the furnace, it is stretched and straightened, and the stretching and straightening amount is 1.3 to 1.5%.

[0016] Further, in step S10, the coiled strip material obtained in step S9 is heated and kept at a temperature of 180-200°C for 2-12 hours to obtain the aluminum alloy material.

[0017] Currently, rolled steel sheets are mainly used for air freight, which have the following disadvantages: 1. High-alloy aluminum alloys are prone to cracking during casting, resulting in a low yield. 2. High degree of alloying makes it prone to cracking and edge splitting during rolling, reducing yield and damaging equipment; 3. When the degree of alloying is high, the plate deforms severely during the heat treatment process, resulting in poor flatness of the plate in the subsequent process; In view of the shortcomings mentioned above in the production of aluminum alloy materials for aviation containers, this invention proposes a method for producing aluminum alloy materials. By controlling the alloy composition and heat treatment, high-quality aluminum alloy coils and strips with excellent mechanical strength, high corrosion resistance, and high surface properties can be obtained, meeting the design requirements of air freight, shortening the process flow, improving the production yield, and saving costs.

[0018] This invention discloses a method for producing aluminum alloy materials. Compared to Al-Zn-Mg-Cu series aluminum alloy sheets, this invention uses Al-Mg-Si series aluminum alloy strips, which have a lower degree of alloying, are easier to cast, and have a higher yield. Furthermore, rolling is less prone to cracking, improving the overall yield. Integrated homogenization and preheating, along with coil aging, shorten the product process flow and reduce costs. Compared to using salt bath quenching to produce aluminum alloy strips for aviation cargo, this invention uses an air-cushion heat treatment unit for strip quenching, reducing surface scratches and improving surface quality. Additionally, controlling the solution temperature, quenching speed, quenching water pressure, and quenching water temperature during quenching improves the mechanical properties of the Al-Mg-Si alloy. After two cleaning cycles of the coiled strip, the surface quality is excellent.

[0019] This invention discloses a method for producing aluminum alloy materials. Based on existing processes, it integrates homogenization and preheating, shortening the process flow and reducing energy consumption. The quenching water temperature is controlled at ≤38℃ in an air-cushion heat treatment unit to ensure sufficient solution quenching of Cu-containing Al-Mg-Si aluminum alloys, obtaining a supersaturated solid solution, ultimately guaranteeing subsequent aging precipitation and improving mechanical properties. Furthermore, the alloy composition ratio is optimized, along with improvements to processes such as recoiling machine cleaning and trimming, air-cushion heat treatment unit cleaning, solution quenching, tension leveling, and coil aging. Through these combined improvements, high-quality aluminum alloy coils and strips with excellent performance are obtained, meeting all performance indicators for aluminum alloys used in aviation containers.

[0020] This invention discloses a method for producing aluminum alloy materials. When one end of the strip enters the quenching zone, the water temperature is set below 30°C. After the other end of the sheet enters the quenching zone, the water temperature of the air-cushion heat treatment unit is controlled below 38°C to reduce the quenching speed and increase the cooling intensity of the strip, thereby obtaining a supersaturated solid solution. This provides more vacancies and nucleation sites for subsequent aging precipitates, ultimately improving the performance of Al-Mg-Si aluminum alloys containing a certain amount of Cu. After solution quenching, the strip is immediately subjected to tensile bending straightening with a tensile rate of 1.0-1.5% to ensure good shape. The surface of the coiled strip is cleaned after cold rolling and before solution quenching to ensure excellent surface quality. Attached Figure Description

[0021] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0022] Figure 1 This is a process flow diagram of the present invention.

[0023] Figure 2These are product images from Embodiment 1 of the present invention.

[0024] Figure 3 These are product images from Embodiment 2 of the present invention.

[0025] Figure 4 These are product images from Embodiment 3 of the present invention.

[0026] Figure 5 This is a product image of Comparative Example 1 of the present invention.

[0027] Figure 6 This is a product image of Comparative Example 2 of the present invention.

[0028] Figure 7 This is a product image of Comparative Example 3 of the present invention. Detailed Implementation

[0029] The following embodiments can help those skilled in the art to more fully understand the present invention, but should not be construed as limiting the present invention in any way.

[0030] Example 1: (Finished product specifications: thickness 0.5mm, width 1500mm) A method for producing aluminum alloy material includes the following steps: Step S1, Ingredients: The chemical composition and mass percentage of the aluminum alloy material are as follows: Si 0.5% Fe ≤0.5% Mg 0.1% Cu 1.2% Ti ≤0.2% Mn 1.0% Zn ≤0.25% The rest consists of Al and unavoidable impurities; Step S2, smelting: Weigh each raw material according to the composition ratio of the aluminum alloy material in step S1, mix them; add 1% by weight of smelting agent, heat to 650℃ to melt the material, hold for 1 hour to obtain molten aluminum; Step S3, casting: The molten aluminum obtained in step S2 is poured and cooled to room temperature to obtain an aluminum alloy ingot. Step S4, Machining: The aluminum alloy ingot obtained in step S3 is cut off at the head and tail and milled. The amount of cutting off the head and tail is 100mm, and the amount of milling is 10mm per side, so as to obtain the machined aluminum alloy ingot. Step S5, Integrated Homogenization and Preheating: The machined aluminum alloy ingot is homogenized and preheated at 480℃ for 25 hours to obtain a preheated ingot; the homogenization and preheating process involves placing the ingot in a heating furnace for heating and heat preservation. Step S6, hot rolling: The preheated ingot is hot rolled in multiple passes, with 16 passes, to obtain a hot-rolled coil strip with a thickness of 5 mm. Step S7, cold rolling: The hot-rolled coil strip is subjected to multiple cold rolling passes, with 5 passes, to obtain a cold-rolled coil strip with a thickness of 0.5 mm. Step S8, Rewinding machine cleaning and trimming: Clean the surface of the cold-rolled coil and trim the edges to obtain the cleaned coil. Step S9, Air Cushion Heat Treatment Unit Cleaning, Solution Quenching, and Straightening: The cleaned strip is further cleaned in the cleaning section of the air cushion heat treatment unit, while simultaneously being heated within the unit to 550°C at a quenching speed of 30 m / min. The strip is then fed into the quenching zone for cooling, ensuring the water temperature remains below 38°C. The quenching zone has nozzles at both the top and bottom, employing water cooling by spraying industrial plasma water from pressure nozzles. The water pressure is 0.01 MPa, ensuring the water temperature remains below 38°C. When one end of the strip enters the quenching zone first, the water temperature is set below 30°C; after the other end enters, the water temperature is set below 38°C. After exiting the furnace, the strip undergoes straightening at a straightening rate of 1.0%, yielding a comprehensively treated strip. Step S10, coil aging: The coil strip obtained in step S9 is heated and kept at a temperature of 200°C for 2 hours to obtain the aluminum alloy material.

[0031] Example 2: (Finished product specifications: thickness 2mm, width 1600mm) A method for producing aluminum alloy material includes the following steps: Step S1, Ingredients: The chemical composition and mass percentage of the aluminum alloy material are as follows: Si 2.0% Fe ≤0.5% Mg 1.2% Cu 0.5% Ti ≤0.2% Mn 0.2% Zn ≤0.25% The rest consists of Al and unavoidable impurities; Step S2, smelting: Weigh each raw material according to the composition ratio of the aluminum alloy material in step S1, mix them; add 4% by weight of smelting flux, heat to 800℃ to melt the material, hold for 8 hours to obtain molten aluminum; Step S3, casting: The molten aluminum obtained in step S2 is poured and cooled to room temperature to obtain an aluminum alloy ingot. Step S4, Machining: The aluminum alloy ingot obtained in step S3 is cut off at the head and tail and milled. The amount of cutting off the head and tail is 800mm, and the amount of milling is 30mm per side, to obtain a machined aluminum alloy ingot. Step S5, Integrated Homogenization and Preheating: The machined aluminum alloy ingot is homogenized and preheated at 580℃ for 5 hours to obtain a preheated ingot; the homogenization and preheating process involves placing the ingot in a heating furnace for heating and heat preservation. Step S6, hot rolling: The preheated ingot is hot rolled in multiple passes, with 8 passes, to obtain a hot-rolled coil strip with a thickness of 8mm. Step S7, cold rolling: The hot-rolled coil strip is subjected to multiple cold rolling passes, with the number of cold rolling passes being 3, to obtain a cold-rolled coil strip with a thickness of 2.0 mm. Step S8, Rewinding machine cleaning and trimming: Clean the surface of the cold-rolled coil and trim the edges to obtain the cleaned coil. Step S9, Air Cushion Heat Treatment Unit Cleaning, Solution Quenching, and Straightening: The cleaned strip is further cleaned in the cleaning section of the air cushion heat treatment unit, while the cleaned strip is heated in the unit to 580°C at a quenching speed of 12 m / min. The strip is then sent to the quenching zone for cooling, ensuring the water temperature is below 38°C. The quenching zone has nozzles at both the top and bottom, using water cooling. Industrial plasma water is sprayed from pressure nozzles to cool the strip. The water pressure is 1 MPa, ensuring the water temperature is below 38°C. When one end of the strip enters the quenching zone first, the water temperature is set below 30°C, and after the other end enters, the water temperature is set below 38°C. After exiting the furnace, the strip is straightened by bending, with a straightening amount of 1.5%, resulting in a comprehensively treated strip. Step S10, coil aging: The coil strip obtained in step S9 is heated and kept at a temperature of 160°C for 20 hours to obtain the aluminum alloy material.

[0032] Example 3: (Finished product specifications: thickness 0.8mm, width 1500mm) A method for producing aluminum alloy material includes the following steps: Step S1, Ingredients: The chemical composition and mass percentage of the aluminum alloy material are as follows: Si 0.8% Fe ≤0.5% Mg 1.0% Cu 0.8% Ti ≤0.2% Mn 0.40% Zn ≤0.25% The rest consists of Al and unavoidable impurities; Step S2, smelting: Weigh each raw material according to the composition ratio of the aluminum alloy material in step S1, mix them; add 2% by weight of smelting agent, heat to 700℃ to melt the material, hold for 4 hours to obtain molten aluminum; Step S3, casting: The molten aluminum obtained in step S2 is poured and cooled to room temperature to obtain an aluminum alloy ingot. Step S4, Machining: The aluminum alloy ingot obtained in step S3 is cut off at the head and tail and milled. The amount of cutting off the head and tail is 200mm, and the amount of milling is 15mm per side, to obtain a machined aluminum alloy ingot. Step S5, Integrated Homogenization and Preheating: The machined aluminum alloy ingot is homogenized and preheated at 530℃ for 8 hours to obtain a preheated ingot; the homogenization and preheating process involves placing the ingot in a heating furnace for heating and heat preservation. Step S6, hot rolling: The preheated ingot is hot rolled in multiple passes, with 12 passes, to obtain a hot-rolled coil strip with a thickness of 6 mm. Step S7, cold rolling: The hot-rolled coil strip is subjected to multiple cold rolling passes, with the number of cold rolling passes being 4, to obtain a cold-rolled coil strip with a thickness of 0.8 mm. Step S8, Rewinding machine cleaning and trimming: Clean the surface of the cold-rolled coil and trim the edges to obtain the cleaned coil. Step S9, Air Cushion Heat Treatment Unit Cleaning, Solution Quenching, and Straightening: The cleaned strip is further cleaned in the cleaning section of the air cushion heat treatment unit, while simultaneously being heated within the unit to 560°C at a quenching speed of 20 m / min. The strip is then fed into the quenching zone for cooling, ensuring the water temperature remains below 38°C. The quenching zone has nozzles at both the top and bottom, employing water cooling by spraying industrial plasma water from pressure nozzles. The water pressure is 0.06 MPa, ensuring the water temperature remains below 38°C. When one end of the strip enters the quenching zone first, the water temperature is set below 25°C; after the other end enters, the water temperature is set below 38°C. After exiting the furnace, the strip undergoes straightening at a straightening rate of 1.3%, resulting in a comprehensively treated strip. Step S10, coil aging: The plate and strip material obtained in step S9 is heated and kept at a temperature of 190°C for 4 hours to obtain the aluminum alloy material.

[0033] Example 4: (Finished product specifications: thickness 0.8mm, width 1500mm) A method for producing aluminum alloy material includes the following steps: Step S1, Ingredients: The chemical composition and mass percentage of the aluminum alloy material are as follows: Si 0.9% Fe ≤0.5% Mg 0.6% Cu 0.9% Ti ≤0.2% Mn 0.60% Zn ≤0.25% The rest consists of Al and unavoidable impurities; Step S2, smelting: Weigh each raw material according to the composition ratio of the aluminum alloy material in step S1, mix them; add 2% by weight of smelting agent, heat to 700℃ to melt the material, hold for 4 hours to obtain molten aluminum; Step S3, casting: The molten aluminum obtained in step S2 is poured and cooled to room temperature to obtain an aluminum alloy ingot. Step S4, Machining: The aluminum alloy ingot obtained in step S3 is cut off at the head and tail and milled. The amount of cutting off the head and tail is 200mm, and the amount of milling is 15mm per side, to obtain a machined aluminum alloy ingot. Step S5, Integrated Homogenization and Preheating: The machined aluminum alloy ingot is homogenized and preheated at 530℃ for 8 hours to obtain a preheated ingot; the homogenization and preheating process involves placing the ingot in a heating furnace for heating and heat preservation. Step S6, hot rolling: The preheated ingot is hot rolled in multiple passes, with 12 passes, to obtain a hot-rolled coil strip with a thickness of 6 mm. Step S7, cold rolling: The hot-rolled coil strip is subjected to multiple cold rolling passes, with the number of cold rolling passes being 4, to obtain a cold-rolled coil strip with a thickness of 0.8 mm. Step S8, Rewinding machine cleaning and trimming: Clean the surface of the cold-rolled coil and trim the edges to obtain the cleaned coil. Step S9, Air Cushion Heat Treatment Unit Cleaning, Solution Quenching, and Straightening: The cleaned strip is further cleaned in the cleaning section of the air cushion heat treatment unit, while simultaneously being heated within the unit to 560°C at a quenching speed of 20 m / min. The strip is then fed into the quenching zone for cooling, ensuring the water temperature remains below 38°C. The quenching zone has nozzles at both the top and bottom, employing water cooling by spraying industrial plasma water from pressure nozzles. The water pressure is 0.04 MPa, ensuring the water temperature remains below 38°C. When one end of the strip enters the quenching zone first, the water temperature is set below 30°C; after the other end enters, the water temperature is set below 38°C. After exiting the furnace, the strip undergoes straightening at a straightening rate of 1.2%, resulting in a comprehensively treated strip. Step S10, coil aging: The coil strip obtained in step S9 is heated and kept at a temperature of 180°C for 6 hours to obtain the aluminum alloy material.

[0034] Comparative Example 1: (Finished product specifications: thickness 0.8mm, width 1500mm) A method for producing aluminum alloy material includes the following steps: Step S1, Ingredients: The chemical composition and mass percentage of the aluminum alloy material are as follows: Si 0.9% Fe ≤0.5% Mg 0.6% Cu 0.9% Ti ≤0.2% Mn 0.60% Zn ≤0.25% The rest consists of Al and unavoidable impurities; Step S2, smelting: Weigh each raw material according to the composition ratio of the aluminum alloy material in step S1, mix them; add 2% by weight of smelting agent, heat to 700℃ to melt the material, hold for 4 hours to obtain molten aluminum; Step S3, casting: The molten aluminum obtained in step S2 is poured and cooled to room temperature to obtain an aluminum alloy ingot. Step S4, Machining: The aluminum alloy ingot obtained in step S3 is cut off at the head and tail and milled. The amount of cutting off the head and tail is 200mm, and the amount of milling is 15mm per side, to obtain a machined aluminum alloy ingot. Step S5, Integrated Homogenization and Preheating: The machined aluminum alloy ingot is homogenized and preheated at 530℃ for 8 hours to obtain a preheated ingot; the homogenization and preheating process involves placing the ingot in a heating furnace for heating and heat preservation. Step S6, hot rolling: The preheated ingot is hot rolled in multiple passes, with 12 passes, to obtain a hot-rolled coil strip with a thickness of 6 mm. Step S7, cold rolling: The hot-rolled coil strip is subjected to multiple cold rolling passes, with the number of cold rolling passes being 4, to obtain a cold-rolled coil strip with a thickness of 0.8 mm. Step S8, Rewinding machine cleaning and trimming: Clean the surface of the cold-rolled coil and trim the edges to obtain the cleaned coil. Step S9, Air cushion heat treatment unit cleaning, solution quenching, and tension straightening: The cleaned strip is further cleaned in the air cushion heat treatment unit cleaning section; the heating temperature is 535℃, and the quenching speed is set to 35m / min; then the strip is sent into the quenching zone for cooling, ensuring the water temperature is below 38℃; the quenching zone has nozzles at both the top and bottom, and water cooling is selected, using industrial plasma water sprayed from pressure nozzles to cool the strip; the water spray pressure is 0.04MPa, ensuring the water temperature is below 38℃; when one end of the strip enters the quenching zone first, the water temperature is set below 30℃, and after the other end of the strip enters the quenching zone, the water temperature is set below 38℃, resulting in a comprehensively treated strip; Step S10, coil aging: The coil strip obtained in step S9 is heated and kept at a temperature of 180°C for 6 hours to obtain the aluminum alloy material.

[0035] Comparative Example 2: (Finished product specifications: thickness 0.8mm, width 1500mm) A method for producing aluminum alloy material includes the following steps: Step S1, Ingredients: The chemical composition and mass percentage of the aluminum alloy material are as follows: Si 0.9% Fe ≤0.5% Mg 0.6% Cu 0.9% Ti ≤0.2% Mn 0.60% Zn ≤0.25% The rest consists of Al and unavoidable impurities; Step S2, smelting: Weigh each raw material according to the composition ratio of the aluminum alloy material in step S1, mix them; add 2% by weight of smelting agent, heat to 700℃ to melt the material, hold for 4 hours to obtain molten aluminum; Step S3, casting: The molten aluminum obtained in step S2 is poured and cooled to room temperature to obtain an aluminum alloy ingot. Step S4, Machining: The aluminum alloy ingot obtained in step S3 is cut off at the head and tail and milled. The amount of cutting off the head and tail is 200mm, and the amount of milling is 15mm per side, to obtain a machined aluminum alloy ingot. Step S5, Integrated Homogenization and Preheating: The machined aluminum alloy ingot is homogenized and preheated at 530℃ for 8 hours to obtain a preheated ingot; the homogenization and preheating process involves placing the ingot in a heating furnace for heating and heat preservation. Step S6, hot rolling: The preheated ingot is hot rolled in multiple passes, with 12 passes, to obtain a hot-rolled coil strip with a thickness of 6 mm. Step S7, cold rolling: The hot-rolled coil strip is subjected to multiple cold rolling passes, with the number of cold rolling passes being 4, to obtain a cold-rolled coil strip with a thickness of 0.8 mm. Step S8, Rewinding machine cleaning and trimming: Clean the surface of the cold-rolled coil and trim the edges to obtain the cleaned coil. Step S9, Air cushion heat treatment unit cleaning and solution quenching: The cleaned strip is further cleaned in the air cushion heat treatment unit cleaning section, the heating temperature is 590℃, and the quenching speed is set to 35m / min; then the strip is sent into the quenching zone for cooling; in the quenching zone, there are nozzles at both the top and bottom, and air cooling is selected. The strip is cooled by air sprayed from the pressure nozzles to obtain the comprehensively treated strip. Step S10, coil aging: The coil strip obtained in step S9 is heated and kept at a temperature of 180°C for 6 hours to obtain the aluminum alloy material.

[0036] Comparative Example 3: (Finished product specifications: thickness 0.8mm, width 1500mm) A method for producing aluminum alloy material includes the following steps: Step S1, Ingredients: The chemical composition and mass percentage of the aluminum alloy material are as follows: Si 0.4% Fe ≤0.5% Mg 2.5% Cu 0.4% Ti ≤0.2% Mn 0.60% Zn ≤0.25% The rest consists of Al and unavoidable impurities; Step S2, smelting: Weigh each raw material according to the composition ratio of the aluminum alloy material in step S1, mix them; add 2% by weight of smelting agent, heat to 700℃ to melt the material, hold for 4 hours to obtain molten aluminum; Step S3, casting: The molten aluminum obtained in step S2 is poured and cooled to room temperature to obtain an aluminum alloy ingot. Step S4, Machining: The aluminum alloy ingot obtained in step S3 is cut off at the head and tail and milled. The amount of cutting off the head and tail is 200mm, and the amount of milling is 15mm per side, to obtain a machined aluminum alloy ingot. Step S5, Integrated Homogenization and Preheating: The machined aluminum alloy ingot is homogenized and preheated at 530℃ for 8 hours to obtain a preheated ingot; the homogenization and preheating process involves placing the ingot in a heating furnace for heating and heat preservation. Step S6, hot rolling: The preheated ingot is hot rolled in multiple passes, with 12 passes, to obtain a hot-rolled coil strip with a thickness of 6 mm. Step S7, cold rolling: The hot-rolled coil strip is subjected to multiple cold rolling passes, with the number of cold rolling passes being 4, to obtain a cold-rolled coil strip with a thickness of 0.8 mm. Step S8, Rewinding machine cleaning and trimming: Clean the surface of the cold-rolled coil and trim the edges to obtain the cleaned coil. Step S9, Air Cushion Heat Treatment Unit Cleaning, Solution Quenching, and Straightening: The cleaned strip is further cleaned in the cleaning section of the air cushion heat treatment unit, while the cleaned strip is heated in the air cushion heat treatment unit to a temperature of 560°C, with a quenching speed of 20 m / min. The strip is then sent to the quenching zone for cooling, ensuring the water temperature is below 38°C. The quenching zone has nozzles at both the top and bottom, and water cooling is selected. Industrial plasma water is sprayed from pressure nozzles to cool the strip. The water pressure is 0.06 MPa, ensuring the water temperature is below 38°C. When one end of the strip enters the quenching zone first, the water temperature is set below 30°C. After the other end of the strip enters the quenching zone, the water temperature is set below 38°C, resulting in a comprehensively treated plate. Step S10, coil aging: The plate material obtained in step S9 is heated and kept at a temperature of 180°C for 6 hours to obtain the aluminum alloy material.

[0037] The properties of the coils and strips prepared in Examples 1-4 and Comparative Examples 1-3 were tested, and the test results are shown in Table 1 below.

[0038] Table 1 Performance parameters of aluminum alloy materials This invention proposes a method for producing aluminum alloy materials. Through alloy composition design and heat treatment control, high-quality aluminum alloy coils and strips with excellent mechanical strength, high corrosion resistance, high toughness, and high surface properties are obtained, meeting the design requirements of air cargo transportation, shortening the process flow, increasing production yield, and saving costs. Compared with Al-Zn-Mg-Cu series aluminum alloy plates, this invention uses Al-Mg-Si series aluminum alloy strips, which have a lower degree of alloying, are easier to cast, and have a higher yield; moreover, rolling is less prone to cracking, improving the overall yield; integrated homogenization and preheating, as well as coil aging, shorten the product process flow and reduce costs. Compared with using salt bath quenching to produce aluminum alloy strips for air cargo transportation, this invention uses an air cushion heat treatment unit to quench the strip, reducing surface scratches and improving surface quality. In addition, controlling the solution temperature, quenching speed, quenching water pressure, and quenching water temperature during quenching improves the mechanical properties of the Al-Mg-Si alloy. After two strip cleanings, the surface quality is excellent.

[0039] The foregoing description of specific exemplary embodiments of the invention is for illustrative and explanatory purposes. These descriptions are not intended to limit the invention to the precise forms disclosed, and it will be apparent that many changes and variations can be made in accordance with the foregoing teachings. The exemplary embodiments were chosen and described in order to explain the specific principles of the invention and its practical application, thereby enabling those skilled in the art to implement and utilize various different exemplary embodiments of the invention, as well as various different choices and variations. The scope of the invention is intended to be defined by the claims and their equivalents.

Claims

1. A method for producing an aluminum alloy material, characterized in that, Includes the following steps: Step S1, Ingredients: The chemical composition and mass percentage of the aluminum alloy material are as follows: Si 0.5~2.0% Fe ≤0.5% Mg 0.1–1.2% Cu 0.5–1.2% Ti ≤0.2% Mn 0.20~1.0% Zn ≤0.25% The rest consists of Al and unavoidable impurities; Step S2, smelting: Weigh each raw material according to the composition ratio of the aluminum alloy material in step S1, mix them; add 1-4% by weight of smelting agent, heat to 650-800℃ to melt the material, hold for 1-8 hours to obtain molten aluminum; Step S3, casting: The molten aluminum obtained in step S2 is poured and cooled to room temperature to obtain an aluminum alloy ingot. Step S4, Machining: The aluminum alloy ingot obtained in step S3 is cut off at the head and tail and milled. The amount of cutting off the head and tail is 100-800 mm, and the amount of milling is 10-30 mm per side, so as to obtain a machined aluminum alloy ingot. Step S5, Integrated Homogenization and Preheating: The machined aluminum alloy ingot is homogenized and preheated at 480-580℃ for 5-25 hours to obtain a preheated ingot. Step S6, hot rolling: The preheated ingot is hot rolled to obtain a hot-rolled coil strip with a thickness of 5-8 mm; Step S7, cold rolling: The hot-rolled coil strip is cold-rolled to obtain a cold-rolled coil strip with a thickness of 0.5 to 2.0 mm; Step S8, Rewinding machine cleaning and trimming: Clean the surface of the cold-rolled coil and trim the edges to obtain the cleaned coil; Step S9, Air-cushion heat treatment unit cleaning, solution quenching, and tension straightening: The cleaned strip is further cleaned in the cleaning section of the air-cushion heat treatment unit, and the cleaned strip is heated in the air-cushion heat treatment unit at a temperature of 550-580℃, with a quenching speed of 12-30m / min; the strip is then sent to the quenching zone for cooling, ensuring the water temperature is below 38℃; after the strip exits the furnace, it is tension straightened with a straightening amount of 1.0-1.5%, resulting in a comprehensively treated strip. Step S10, coil aging: The coil strip obtained in step S9 is heated and kept at a temperature of 160-200℃ for 2-20 hours to obtain the aluminum alloy material.

2. The method for producing an aluminum alloy material according to claim 1, characterized in that, The chemical composition and mass percentage of the aluminum alloy material in step S1 are as follows: Si 0.8~2.0% Fe ≤0.5% Mg 0.4–1.2% Cu 0.8–1.2% Ti ≤0.2% Mn 0.40~1.0% Zn ≤0.25% The rest consists of Al and unavoidable impurities.

3. The method for producing an aluminum alloy material according to claim 1, characterized in that, In step S2, each raw material is weighed according to the composition ratio of the aluminum alloy material in step S1 and mixed; 2-4% by weight of smelting agent is added, and the mixture is heated to 700-800℃ to melt the material. The heat is maintained for 4-8 hours to obtain molten aluminum.

4. The method for producing an aluminum alloy material according to claim 1, characterized in that, In step S4, the aluminum alloy ingot obtained in step S3 is subjected to head and tail trimming and milling. The head and tail trimming amount is 200-800 mm, and the milling amount is 15-30 mm per side, to obtain a machined aluminum alloy ingot.

5. The method for producing an aluminum alloy material according to claim 1, characterized in that, In step S5, the machined aluminum alloy ingot is homogenized and preheated at 530-580℃ for 8-25 hours to obtain a preheated ingot.

6. The method for producing an aluminum alloy material according to claim 1, characterized in that, In step S6, the preheated ingot is hot rolled in multiple passes, with 8 to 16 passes, to obtain hot-rolled coil strip with a thickness of 5 to 8 mm.

7. The method for producing an aluminum alloy material according to claim 1, characterized in that, In step S7, the hot-rolled coil strip is subjected to multiple cold rolling passes, with the number of cold rolling passes being 3 to 5, to obtain a cold-rolled coil strip with a thickness of 0.5 to 2.0 mm.

8. The method for producing an aluminum alloy material according to claim 1, characterized in that, In step S9, the cleaned strip is further cleaned in the cleaning section of the air cushion heat treatment unit, and the cleaned strip is heated in the air cushion heat treatment unit at a temperature of 560-575°C and a quenching speed of 16-30 m / min. The strip is then sent to the quenching zone for cooling, ensuring that the water temperature is below 38°C. After the strip exits the furnace, it is straightened by bending, with a straightening amount of 1.2-1.5%, to obtain the comprehensively treated strip.

9. A method for producing an aluminum alloy material according to claim 1, characterized in that, In step S9, the quenching zone has nozzles at both the top and bottom. Water cooling is selected, and industrial plasma water sprayed from the pressure nozzles is used to cool the strip. The water spray pressure is 0.01 to 1 MPa to ensure that the water temperature is below 38°C. When one end of the strip enters the quenching zone first, the water temperature is set to be below 30°C. After the strip exits the furnace, it is stretched and straightened, and the stretching and straightening amount is 1.3 to 1.5%.

10. A method for producing an aluminum alloy material according to claim 1, characterized in that, In step S10, the strip material obtained in step S9 is heated and kept at a temperature of 180-200°C for 2-12 hours to obtain the aluminum alloy material.

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