Stamping process can be divided into separate processes and forming processes (divided bending, deep drawing, forming) two categories. Separation step are separated from each other in the stamping process, to the stamping of the blank along a contour line, while the section of the separation quality stampings must meet certain requirements; stamping the blank molding step is to occur in the plastic deformation without breaking, and transformed into the final shape required, but also should satisfy the other requirements dimensional tolerances. Cold stamping and hot stamping in two ways according to the temperature conditions during stamping. Depending on the material strength, ductility, thickness, and the capability of deformation, etc., taking into account the state of the raw material and the final heat treatment conditions.