Production technology of aluminum alloy sectional bar for automobile bumper

Abstract

The invention discloses a production technology of an aluminum alloy sectional bar for an automobile bumper and belongs to the technical field of metal machining. The aluminum alloy sectional baral bar for the bumper is processed through the steps of mixing, melting, permanent magnetic stirring, temperature measurement, sampling, ingredient and temperature adjustment, turning down, refining(first purification), standing still, online addition of Al-Ti-B wire, online removal of gas and sand (secondary purification), two-stage filtration, same-level hot top casting, cast ingot homogenization, machining of cast ingot, inspection of cast ingot, heating of cast ingot by an induction furnace, extrusion, precise on-line quenching, stretching and straightening, aging, structure and property inspection of sectional bars, and delivery. The aluminum alloy sectional bar processed by the technology is excellent in thermal deformation performance, and high in strength due to on-line quenching during extrusion. The product has excellent welding performance and corrosion resistance, certain resistance to stress corrosion, and especially has strong shock absorption and folding resistance.

Description

technical field [0001] The invention relates to metal machining, in particular to a production process of aluminum alloy profiles used for automobile bumpers. 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 polypropylene materials increase the ris...

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 the strong ability to absorb impact and resist folding, so it is especially suitable for extruding into hollow profiles to make automobile bumpers. How to process aluminum alloy profiles with similar or better performance is what we want to solve However, when processing this type of aluminum alloy profiles, 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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