Hot forming method for special-shaped variable-section pipe structural parts of aluminum alloy body

Abstract

The invention discloses a thermal forming method for aluminum alloy car-body special-shaped variable-section pipe structural members. The method includes the following steps that S1, a pipe blank is filled with solid particles, and the pipe blank is placed in a heating furnace and heated to the aluminum alloy solid solution treatment temperature; S2, the heated pipe blank is placed in a mold, and the aluminum alloy pipe blank in the solid solution state is stamped; S3, the part is subjected to fast quenching treatment while being formed; and S4, the quenched pipe fitting is placed in the heating furnace for artificial aging, and the pipe fitting is formed finally. According to the thermal forming method for the aluminum alloy car-body special-shaped variable-section pipe structural members, the technical operation is easy, the pipe can be formed through an ordinary press and the ordinary mold, efficiency is high, and cost is low. The defects that plasticity is poor, springback is high, and texture performance is difficult to control in the aluminum alloy forming process can be overcome. The hollow aluminum alloy variable-section car-body structural members with complex shapes and excellent performance can be formed at a time.

Description

technical field [0001] The invention belongs to the technical field of automobile lightweight manufacturing, and relates to a thermoforming method for an aluminum alloy pipe, in particular to a thermoforming method for a special-shaped variable-section pipe structural part of an aluminum alloy body. Background technique [0002] The light weight and high strength of structural parts is one of the key issues to be solved urgently to realize the lightweight of automobiles. In addition to the use of light-weight materials, another main way to reduce the weight of automobiles is to "bring solidity with empty space". Through reasonable structural design, many parts can be made of pipes. Aluminum alloy has the characteristics of low density, low price, rich resources, high specific strength and specific stiffness, and has become the material of choice for lightweight automotive structural parts. The special-shaped variable-section pipe structure of aluminum alloy body, as a hollo...

AI Technical Summary

Problems solved by technology

[0005] In order to solve the deficiencies in the current forming technology of aluminum alloy variable cross-section tubular body structural parts, such as low precision, low efficiency and high cost of tailor welding forming, difficult sealing, serious pollution and temperature limitation in hydroforming; the application of thermal expansion forming of solid particle medium The scope is narrow, etc. The present invention provides a method for thermoforming aluminum alloy body special-shaped variable-section pipe structural parts. It uses ordinary presses and molds to hot stamp aluminum alloy pipes. The equipment is simple and the investment is small. Due to defects such as poor plasticity, large springback, and difficult control of microstructure and properties in alloy forming, aluminum alloy hollow special-shaped variable-section body structural parts with complex shapes and excellent performance can be formed at one time

Images