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Preparation method of Al-Mg alloy board for autobody

A technology of automobile body and alloy plate, applied in the field of alloy, can solve problems such as deterioration of plate surface quality

Active Publication Date: 2013-09-25
ZHEJIANG GKO IND CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] However, the 5XXX series aluminum alloys disclosed in the prior art have tensile strain lines formed on the surface due to the interaction of dislocations, thereby deteriorating the surface quality of the plate.

Method used

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  • Preparation method of Al-Mg alloy board for autobody
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  • Preparation method of Al-Mg alloy board for autobody

Examples

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preparation example Construction

[0031] The invention provides a kind of preparation method of Al-Mg alloy sheet for automobile body, comprising the following steps:

[0032] a) Provide Al-Mg alloy plate after cold rolling, the cold rolling deformation is not less than 70%;

[0033] b) Heating the cold-rolled Al-Mg alloy plate to 480°C-550°C and holding it for 5 minutes for continuous annealing, and the heating rate is not less than 5°C / s;

[0034] c) cooling the continuously annealed Al-Mg alloy plate to below 150°C, and the cooling rate is not less than 10°C / s;

[0035] d) leveling the cooled Al-Mg alloy plate;

[0036] e) heat-treating the leveled Al-Mg alloy sheet to obtain an Al-Mg alloy sheet for an automobile body.

[0037] The method provided by the invention uses cold-rolled sheets with a cold deformation of not less than 70% as raw materials, and performs high-temperature short-time annealing on them, thereby preventing grain coarsening, obtaining fine recrystallized particles, and improving the a...

Embodiment 1

[0066] 4.53wt% of Mg, 0.28wt% of Mn, 0.08wt% of Cu, 0.03wt% of Cr, 0.05wt% of Zn, 0.15wt% of Si, 0.27wt% of Fe, 0.02wt% of Ti and other A large amount of Al and unavoidable impurities are prepared by DC casting to obtain aluminum alloy ingots;

[0067] Homogenizing the obtained ingot at a temperature of 460° C. for 10 hours;

[0068] After the homogenization treatment, the initial cut head and face milling are reheated to 430°C for hot rolling. The final rolling temperature of hot rolling is 320°C, and the final rolling thickness of hot rolling is 5mm;

[0069] The hot-rolled aluminum alloy plate is cold-rolled, and the cold deformation of the cold rolling is 80%, to obtain a 5182 aluminum-magnesium alloy plate with a thickness of 1mm.

Embodiment 2

[0071] The 5182 aluminum alloy plate obtained in Example 1 with a cold deformation of 80% and a thickness of 1mm is heated to 500°C at a heating rate of 5°C / s through a continuous annealing furnace and held for 3min for annealing, and the plate is cooled by strong wind To 140°C, the cooling rate is 20°C / s;

[0072] Then use straightening rollers to level the annealed 5182 aluminum alloy sheet through repeated bending;

[0073] Then the 5182 aluminum alloy plate after leveling was kept warm for 2h at 200°C to obtain an Al-Mg alloy for automobile body panels.

[0074] In the present invention, the Al-Mg alloy plate is subjected to a tensile test at room temperature before leveling, after leveling and after heat treatment, and the results are shown in Table 1. Table 1 shows the Al-Mg obtained at different process stages in Example 2 of the present invention Performance test results of alloy plates.

[0075] The present invention carries out tensile test test to the Al-Mg alloy ...

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Abstract

The invention provides a preparation method of an Al-Mg alloy board for an autobody, comprising the following steps: a) providing an Al-Mg alloy board which has undergone cold rolling, wherein cold rolling deformation is less than 70%; b) heating the Al-Mg alloy board which has undergone cold rolling to 480-550 DEG C, carrying out thermal insulation within 5 min, and continuously annealing, wherein the heating speed is not less than 5 DEG C / s; c) cooling the Al-Mg alloy board which has undergone continuous annealing to less than 150 DEG C, wherein the cooling speed is not less than 10 DEG C / s; d) carrying out leveling processing on the cooled Al-Mg alloy board; and e) carrying out heat treatment on the Al-Mg alloy board which has undergone leveling processing. According to the invention, a cold-rolled sheet with the cold rolling deformation being not less than 70% is used as a raw material and undergoes high-temperature short-time annealing, rapid cooling and heat treatment. Thus, forming property of the Al-Mg alloy is raised, and generation of A-type flow lines is avoided during the forming process.

Description

technical field [0001] The invention relates to the technical field of alloys, in particular to a method for preparing an Al-Mg alloy plate for automobile bodies. Background technique [0002] The world's auto industry is facing three increasingly severe issues: energy, environmental protection, and safety. Reducing the weight of automobiles, reducing energy consumption, reducing environmental pollution, improving fuel economy of automobiles, and saving limited resources have become the focus of major automobile factories. [0003] Aluminum alloy has a series of excellent characteristics such as high specific strength, good corrosion resistance, good impact resistance, easy surface coloring, good processing formability, and high recycling and regeneration, making it an excellent choice for lightweight automobiles. The preferred material, with excellent properties unmatched by other alloys. [0004] Since the car body accounts for about 30% of the total vehicle weight, alum...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22F1/047
Inventor 朱其柱丁荣辉茅海波齐基张超
Owner ZHEJIANG GKO IND CO LTD
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