Sheet metal has the characteristics of light weight, high strength, low cost and good mass production performance. It has been widely used in the fields of electronic appliances, communication, automobile industry, medical devices and so on. With the application of sheet metal more and more widely, the design of sheet metal parts has become a very important part in product development. Mechanical engineers must master the design skills of sheet metal parts, so that the designed sheet metal can not only meet the requirements of product function and appearance, but also make the stamping die manufacturing simple and low cost.