Stamping is a forming processing method that relies on press and mold to exert external force on plate, strip, pipe and profile to produce plastic deformation or separation, so as to obtain the required shape and size of the workpiece (stamping). Stamping and forging are plastic processing (or pressure processing), collectively called forging. The blank for stamping is mainly hot-rolled and cold-rolled steel plate and strip.

60-70% of the world's steel is sheet, most of which is stamped into finished products. Automobile body, chassis, fuel tank, radiator, boiler drum, container shell, motor, electrical iron core silicon steel sheet and so on are stamping processing. Instruments, household appliances, bicycles, office machinery, household utensils and other products, there are also a large number of stamping parts.

Compared with castings and forgings, the stamping parts have the characteristics of thin, uniform, light and strong. Stamping can increase rigidity by producing parts with stiffeners, ribs, undulations or flanges that would otherwise be difficult to produce. Due to the use of precision die, workpiece accuracy can reach micron level, and high repetition accuracy, consistent specifications, can be stamped out of the hole, boss, etc.. Cold stamping parts are generally no longer machined, or require only a small amount of cutting. The precision and surface state of hot stamping parts are lower than that of cold stamping parts, but they are still better than castings and forgings. Stamping is an efficient production method, the use of composite die, especially multi-station progressive die, can be completed in a press multi-channel stamping process, to achieve the full automatic production from material unwinding, leveling, blanking to forming, finishing. High production efficiency, good working conditions, low production cost, generally can produce hundreds of pieces per minute.

Stamping parts processing is mainly classified by technology, which can be divided into two categories: separation process and forming process. Separation process is also called blanking, its purpose is to make the stamping parts along a certain contour line from the sheet metal separation, at the same time to ensure the quality requirements of the separation section. The purpose of the forming process is to make the sheet metal plastic deformation under the condition of not breaking the blank, to make the required shape and size of the workpiece. In actual production, many processes are often integrated into one workpiece. Blanking, bending, shearing, drawing, bulging, spinning, correction are several main stamping processes.

The surface and intrinsic properties of the sheet metal for stamping have a great influence on the quality of the finished product, which requires the thickness of the stamping material to be accurate and uniform. Smooth surface, no spots, no scars, no scratches, no surface cracks, etc. Uniform yield strength, no obvious direction; High uniform elongation; Low compressive strength ratio; Low work hardening. In the actual production, commonly used and stamping process similar to the process of technology test, such as drawing performance test, bulging performance test and so on to test the stamping performance of materials, in order to ensure the quality of finished products and high pass rate.

The precision and structure of die directly affect the forming and precision of stamping parts. Mold manufacturing cost and life are important factors affecting the cost and quality of stamping parts. Mold design and manufacturing require more time, which extends the production preparation time of new stamping parts. Mold base, frame, guide the standardization and development of simple mold (for small batch production), compound die, multi-station progressive die (for mass production), as well as the development of quick die change equipment, can reduce the stamping production preparation work and shorten the preparation time, can reduce for stamping production preparation work and shorten the preparation time, The advanced stamping technology suitable for mass production can be reasonably applied to small batch and multi-variety production.

Stamping parts processing equipment in addition to thick plate with hydraulic forming machine, generally adopt mechanical press. With modern high-speed multi-station mechanical press as the center, equipped with uncoiling, leveling, finished product collection, conveying machinery, die bank and quick die changing device, and controlled by computer program, the automatic stamping production line with high productivity can be formed. In the production of tens of hundreds of stamping parts per minute, in a short time to complete the feeding, stamping, parts, waste discharge and other processes, often personal, equipment and quality accidents. Therefore, the safety production of stamping parts processing is a very important problem.