Stamping is a production technology that uses the power of conventional or special stamping equipment to make the sheet metal directly subject to deformation force and deform in the mold, so as to obtain product parts with certain shape, size and performance. Sheet metal, mold and equipment are the three elements of stamping processing. Stamping is a kind of metal cold deformation processing method. Therefore, it is called cold stamping or sheet metal stamping, or stamping for short. It is one of the main methods of metal plastic processing (or pressure processing), and also belongs to material forming engineering technology.