Looking at the production process of automotive aluminum sheets, from the perspective of microstructure, it can be simply summarized into two aspects: cleanliness (chemical metallurgical process) and uniformity (physical metallurgical process). Reflected in the actual mass production process is the control process of smelting (casting) and rolling (heat treatment). Excellent aluminum liquid cleanliness and organization (texture) uniformity have a positive effect on the stamping and connection performance of subsequent automobile production plants. The uniformity of the structure (texture) includes not only the size of the grain size of the matrix structure, but also the ratio of the micro-texture that is conducive to formability. The macroscopic external performance of the material performance is based on its microscopic internal nature. Reasonable control of the microstructure and texture can obtain the required macroscopic properties.
In view of the mismatch between the production time of the raw material aluminum factory and the automobile factory, the natural aging of the automobile aluminum plate will occur during the interphase process, which affects the subsequent molding. In order to solve this problem, domestic and foreign material engineers conducted in-depth and systematic research on the theoretical mechanism of the process, and proposed a pre-aging/pre-strain treatment process. Through the pre-aging process after solid solution treatment in the raw material factory, the natural aging problem in the transportation and storage of the sheet can be alleviated, so that it has better formability in the stamping process.