Stamping mainly by technology classification, separation process can be divided into two categories and the forming process. Separation step, also known as punching, stamping its purpose is to separate from the sheet along a certain contour, while maintaining the quality requirements of separation sections (Table 1). The purpose is to make the forming process of sheet plastic deformation without breaking the blank condition, shape and size of the workpiece into the desired. In actual production, it is often used in a variety of processes integrated workpiece. Punching, bending, shearing, stretching, bulging, spinning, correction of several major stamping process.