Processing method of aluminum profile for passenger vehicle

Abstract

The invention provides a processing method of an aluminum profile for a passenger vehicle. The processing method comprises the following steps: selecting an Al-Mg-Si series aluminum alloy ingot with the weight percentage of Mg being 0.5-1.1%, the weight percentage of Si being 0.4-0.8% and the weight percentage of Fe being less than 0.6% as an extrusion raw material of the aluminum profile; raw material selection and provided extrusion parameters are reasonable, during extrusion, metal flow is uniform, efficient and rapid, the machining range is wide, the aluminum profile extrusion device can be suitable for machining aluminum profiles of passenger vehicles with various sections and sizes, and the extruded aluminum profiles are fine in crystal grain, high in straightness, good in strength, stable in performance and high in rate of finished products. According to the provided combined online quenching method, accurate cooling control can be carried out according to the temperature and the structure state of the profile, quenching cooling is uniform, the quenching requirements of aluminum profiles with different thicknesses and complex section structures can be met, the cooling range is wide, the application range is wide, the cooling efficiency of some aluminum profiles not suitable for online quenching can also meet the online quenching requirement, and the service life of the aluminum profiles is prolonged. And the process of independent quenching can be omitted, so that the equipment investment is reduced, and the production cost is reduced.

Description

technical field [0001] The invention relates to the field of processing and manufacturing aluminum profiles, in particular to a processing method for aluminum profiles for passenger vehicles. Background technique [0002] Commonly used metal materials for vehicles are stainless steel and aluminum alloy. With the development of aluminum profile extrusion technology, it has become the main material for vehicles because of its light weight, beautiful appearance, corrosion resistance, excellent mechanical properties, long life, low cost and easy assembly. The aluminum alloys used for passenger vehicles are mainly 6XXX series Al-Mg-Si aluminum alloys, mainly including 6061 and 6063 aluminum alloys. In passenger vehicles, 6061 is mainly used for the body frame due to its high strength and corrosion resistance, and 6063 is mainly used for its good formability. And easy to color mainly used for interior components. Even for the same series of aluminum alloys, according to their use...

AI Technical Summary

Problems solved by technology

The unreasonable heating, extrusion speed and extrusion temperature of aluminum alloy ingot will make the metal flow unsmooth, and the aluminum profile will have defects such as twisting and surface roughening

On-line quenching is also the most important process that affects product performance and bending degree. On-line quenching replaces the quenching method heated by a separate quenching furnace, which can reduce equipment investment and save energy, thereby reducing production costs. However, some cross-sectional structures are complex and the wall thickness is different. Excessive aluminum profiles or aluminum profiles with excessive thickness are not suitable for on-line quenching. On-line quenching often has the problem of uneven cooling or insufficient cooling rate, resulting in problems such as bending, warping, or insufficient mechanical properties.

At present, the processing method of aluminum profiles has a narrow range of online quenching and cooling. It is to process aluminum profiles with complex cross-sectional structures and different wall thicknesses or aluminum profiles with excessive thickness by adding a separate quenching process or adding an additional straightening process. In addition to the cost, the product performance is not stable, and the strength is not good enough