60 to 70% of the world's steel products are sheets, most of which are stamped into finished products. The body, chassis, fuel tank, radiator sheet of the car, the steam drum of the boiler, the shell of the container, the iron core silicon steel sheet of the motor and the electrical appliance are all stamped. There are also a large number of metal stamping parts in instruments, household appliances, bicycles, office machinery, living utensils and other products.
 
Compared with castings and forgings, Nanpi metal stamping parts have the characteristics of thinness, uniformity, lightness and strength. Stamping can produce workpieces with ribs, ribs, undulations or flanging that are difficult to manufacture by other methods to improve their rigidity. Due to the use of precision molds, the accuracy of the workpiece can reach micron level, and the repeatability is high and the specifications are consistent, and holes, bosses, etc. can be punched out.
 
Cold stampings are generally no longer machined, or require only a small amount of machining. The accuracy and surface state of hot stamping parts are lower than those of cold stamping parts, but they are still better than castings and forgings, and the amount of machining is less.
 
Stamping is an efficient production method. The use of composite molds, especially multi-station progressive molds, can complete multiple stamping processes on one press, and realize the complete process from strip uncoiling, leveling, punching to forming and finishing. Automatic production. The production efficiency is high, the labor conditions are good, and the production cost is low. Generally, hundreds of pieces can be produced per minute.
 
Stamping is mainly classified according to the process, which can be divided into two categories: separation process and forming process. The separation process is also called blanking, and its purpose is to separate the stamping parts from the sheet along a certain contour line, while ensuring the quality requirements of the separation section. The surface and intrinsic properties of the sheet metal for stamping have a great influence on the quality of the stamped product, and the thickness of the stamping material is required to be accurate and uniform; the surface is smooth, without spots, scars, scratches, and surface cracks; Directionality; high uniform elongation; low yield ratio; low work hardening.

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