Due to the different shapes, dimensions, precision requirements, batch size, and raw material properties of cold stamping, the stamping methods are various, but they can be divided into two categories: separation process and deformation process. The separation process separates the stamping parts or the blanks from each other along a certain wheel seat; the deformation process is to plastically deform the blanks without causing damage to the materials, and to form the parts of the required shape and size.