Aluminum alloy cast ingot for automotive bumper and production process thereof

Abstract

The invention relates to an aluminum alloy cast ingot for an automotive bumper and a production process thereof and belongs to the technical fields of aluminum alloy and processing technique. The processing of the aluminum alloy cast ingot for the automotive bumper is finished by the following steps of: material proportioning, smelting, permanent magnetism stirring, temperature measurement, sampling, adjustment of ingredient and temperature, turning down, refining (first purification), standing, online adding of Al, Ti and B wires, online degassing and slag removal (secondary purification), double filtering, equal-level hot top casting, cast ingot homogenization, machining of the cast ingot, inspection of the cast ingot and heating of the cast ingot by an induction furnace. The hard aluminum alloy cast ingot, machined in the invention, has excellent thermal deformation performance and higher strength after being subjected to online quenching in extrusion process, the welding property and corrosion resistance of a product are excellent, and the product has certain stress-corrosion resistance and particularly has stronger shock absorption capacity and folding resistance.

Description

technical field [0001] The invention relates to an aluminum alloy and its mechanical processing, in particular to an aluminum alloy ingot used for automobile bumpers and its production process. Background technique [0002] At present, with the rapid development of the automobile industry, people have higher and higher requirements for the cost performance of automobiles. Automobile bumper is a thin-arm structural part with large surface area and complex shape. It requires excellent high and low temperature impact toughness, rigidity, aging resistance, heat resistance and cold resistance; while the existing automobile bumpers mostly use Preparation of materials such as polyurethane elastomer and ABS. The molding process of these materials is complicated and expensive, which increases the cost of automobiles and increases the burden on buyers; polypropylene materials are widely used in Automotive applications are increasing, but the low toughness and impact strength of polyp...

AI Technical Summary

Problems solved by technology

Automobile bumper is a thin-arm structural part with large surface area and complex shape. It requires excellent high and low temperature impact toughness, rigidity, aging resistance, heat resistance and cold resistance; while the existing automobile bumpers mostly use Preparation of materials such as polyurethane elastomer and ABS. The molding process of these materials is complicated and expensive, which increases the cost of automobiles and increases the burden on buyers; polypropylene materials are widely used in Automotive applications are increasing, but the polypropylene material has low toughness and impact strength, which increases the risk for drivers and passengers, and the gloss and smoothness of the finished surface are poor

[0003] 7NB46 belongs to the Al-Zn-Mg superhard aluminum alloy. Because of its good thermal deformation properties, it has high strength after on-line quenching during extrusion. The product has good welding performance and corrosion resistance, and has a certain resistance to stress corrosion. performance, especially strong shock absorption and anti-folding performance, so it is especially suitable for extruding into hollow profiles to make automobile bumpers. How to process aluminum alloy ingots with similar performance or better performance is what we want to solve However, when processing this type of aluminum alloy ingot, defects such as feather crystals often appear in the production process

Feather crystal has a thick and straight crystal axis, and its mechanical properties have strong anisotropy, which not only destroys the process performance but also greatly reduces the mechanical properties

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