Metal stamping, also known as sheet metal stamping, is usually carried out at room temperature, sometimes called cold stamping. It is a processing method which uses stamping equipment (press) and die to permanently deform or separate plates or blanks with different specifications under the action of pressure to make parts with various shapes. Cold stamping can be used to process metal and nonmetal materials. It is widely used in industrial production as cutting, casting, electrical machining and other processing methods. Because cold stamping is a processing method with high production efficiency and small cutting amount, it occupies a very important processing position in aviation, automobile, tractor, motor, precision instrument and other industries. According to preliminary statistics, 60% to 75% of parts in the automobile manufacturing industry alone are made by cold stamping process. Among them, the labor amount of cold stamping production accounts for 25% to 30% of the total labor amount of the whole automobile industry. In the production of motors and instruments, 60% to 70% of parts are completed by cold stamping process. Especially in recent years, due to the research and development of cold extrusion and precision blanking technology, the application scope of cold stamping technology has been expanding. In addition, such as electronic industry, aircraft, missiles and various guns, guns and other parts processing, cold stamping processing volume also accounts for a considerable proportion.