Custom sheet metal parts are the products processed by the sheet metal process. We can't live without the sheet metal parts everywhere. Sheet metal parts are produced by filament windings, laser cutting, heavy duty machining, metal bonding, metal drawing, plasma cutting, precision welding, roll forming, sheet metal bending, die forging, and water jet cutting. A definition on a foreign professional journal can define sheet metal as: Sheet metal is a comprehensive cold-working process for metal sheets (usually below 6mm), including shear, punch/cut/composite, folding, welding, riveting, splicing , molding (such as car body) and so on. Its distinguishing feature is the uniform thickness of the same part. Sheet metal part are light weight, high strength, conductive (can be used for electromagnetic shielding), low cost, large-scale mass production performance, etc., and have been widely used in fields such as electronic appliances, communications, automobile industry, medical equipment, etc. In the computer case, mobile phone, MP3, sheet metal parts are an essential part. With the increasing use of sheet metal, the design of sheet metal part has become an important part of the product development process. Mechanical engineers must be skilled in the design of sheet metal parts, so that the design of sheet metal can satisfy the requirements of the product. The requirements of function and appearance also make the stamping die simple to manufacture and low in cost.