Sheet Metal Production, is a kind of synthesis of sheet metal cold working process, including cutting, punching, cutting, composite, folding, riveting, splicing, molding, sheet metal with light weight, high strength and conductivity (can be used in electromagnetic shielding), low cost, mass production performance is good wait for a characteristic, in electronic appliances, communications, automotive, medical equipment and other fields has been widely used, for example in the computer case, mobile phone, MP3, sheet metal paart is essential