Stamping parts are formed by applying external force to plates, strips, pipes and profiles by means of presses and molds to produce plastic deformation or separation, so as to obtain workpieces (stamping parts) of the required shape and size. Stamping and forging are both plastic processing and collectively referred to as forging.
In the world's steel, 60 to 70% are plates, most of which are stamped into finished products. Car bodies, chassis, fuel tanks, radiator fins, boiler drums, container shells, motors, iron cores of electrical appliances, silicon steel sheets, etc. are all processed by stamping. There are also a large number of stamping parts in products such as instruments, household appliances, bicycles, office machinery, and living utensils.
Compared with castings and forgings, the precision metal stamping has the characteristics of thinness, uniformity, lightness and strength. Stamping can produce workpieces with stiffeners, ribs, undulations or flanges that are difficult to manufacture by other methods to improve their rigidity. Due to the use of precision molds, the precision of the workpiece can reach the micron level. Moreover, it has high repeatability and consistent specifications, and can punch out holes and bosses.
Cold stamping parts are generally no longer processed by cutting, or only a small amount of cutting processing is required. The precision and surface condition of hot metal stamping products are lower than cold stamping parts, but still better than castings and forgings, and the cutting amount is less.
The stamping parts adopt compound molds, especially multi-station progressive molds, which can complete multiple stamping processes on one press. It can realize fully automatic production from strip uncoiling, leveling, punching to forming and finishing. The production efficiency is high, the working conditions are good, and the production cost is low. Generally, hundreds of pieces can be produced per minute.
