At present, the sheet metal chassis and sheet metal cabinet is very popular , why is popular ? many people don't know, in fact, it is related to the nature of it, because the physical properties of sheet metal cabinet, light weight, high strength, low cost, and can be mass production. The sheet metal chassis and cabinet usually includes the outer shell, bracket, the various switches of the panel, the indicator lamp and so on. The outer shell is made of steel plate and plastic, and the hardness is high, which mainly protects the inner components of the chassis. The brackets are mainly used for fixed motherboards, power sources and various drives. Metal appearance and materials is a case of the most basic characteristics, appearance can decide a case directly accepted by the user's first condition, so the appearance of the current is also gradually toward diversified development, therefore also has a certain ratio in our tests. The material that USES material mainly depends on the case of the machine box, the corner horn of the machine box is handled by the coil, the material good and bad also affect the performance of the anti-electromagnetic radiation directly. Only of sheet metal is the most popular, contemporary as sheet metal processing and the application widely more and more , sheet metal parts design into a very important part of the product development process, mechanical engineers must master the design technique of sheet metal parts, sheet metal makes the design meets both of the product function and appearance requirement, and can make the stamping mould manufacturing is simple and low cost. The chassis and cabinet of sheet metal frame is not only good-looking, but also durable and long life. And in addition to the cosmetic requirements, the design of the sheet metal shall guarantee the stamping process is simple, easy stamping molds, sheet metal stamping are of good quality, stable size, etc, also is the prevalence of these advantages make the sheet metal processing company.