Why do we need to perform heat treatment during sheet metal processing?

　　As one of the more important processing techniques in the material production process, metal heat treatment technology has great advantages compared with other general processing techniques. The "four fires" in metal heat treatment refer to annealing, normalizing, quenching (solid solution) and tempering (aging). When the workpiece is heated and reaches a certain temperature, different holding times are used according to the size and material of the workpiece, and then slowly cooled, which is annealing. The main purpose of annealing is to appropriately reduce the hardness of the material, improve the plasticity of the material, and facilitate the subsequent sheet metal processing. It is a processing technology that uses machine tools to process parts. Therefore, sheet metal processing will perform corresponding heat treatment processes before and after the parts are processed.

　　The reasons for heat treatment during sheet metal processing are as follows:

　　1. Remove the internal stress of the blank. It is mostly used for castings, forgings, and welded parts.

　　2. Improve the processing conditions to make the material easy to process. Such as annealing, normalizing, etc.

　　3. Improve the comprehensive sheet metal processing function of metal materials. For example, quenching and tempering treatment.

　　4. It can improve the hardness of materials. For example, quenching, carburizing and quenching, etc.

　　To sum up, this is the reason why heat treatment is performed during sheet metal processing. In the process of sheet metal processing, in addition to the reasonable selection of materials and various forming processes, heat treatment processes are often indispensable. After all, heat treatment generally does not change the shape and overall chemical composition of the workpiece, but by changing the microstructure inside the workpiece, or changing the chemical composition of the workpiece surface, it gives or improves the use function of the workpiece. Therefore, we can improve the intrinsic quality of sheet metal parts through heat treatment, which is generally not visible to the naked eye.