The so-called stampings is made by the method of stamping workpiece or blank. Design of stamping parts must meet the product use and technical performance, and can be convenient for assembly and replacement. In the permission of using cheap materials, as far as possible make the parts do not waste and waste less cutting. In the design of stamping parts must be simple shape, reasonable structure, to help simplify the mould structure, simplify the process number, which is the least, the most simple stamping process to complete the whole parts processing. Now join in the design of stamping parts and reduce the loss of design concept, reduce material varieties and specifications, which is beneficial to improve the utilization rate of metal materials.