How are metal stamping parts made

The punching machine and die apply external force to plates, strips, pipes and profiles to produce plastic deformation or separation, thereby obtaining a forming method for workpieces of required shape and size, and the resulting workpiece is a stamping part. Stamping is a forming processing method that relies on presses and molds to apply external force to plates, strips, pipes and profiles to cause plastic deformation or separation, so as to obtain workpieces (punchings) of desired shape and size. Stamping and forging are both plastic processing (or pressure processing), collectively referred to as forging. The stamped blanks are mainly hot-rolled and cold-rolled steel plates and strips

Compared with castings and forgings, stamping parts have 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 accuracy of the workpiece can reach the micron level, and the repeatability is high, the specifications are consistent, and holes, bosses, etc. can be punched out.

　　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 stamping parts are lower than cold stamping parts, but still better than castings and forgings, and the cutting amount is less.

　　 Stamping is an efficient production method. It uses compound dies, especially multi-station progressive dies, which can complete multiple stamping processes on one press, and realizes the process from strip uncoiling, leveling, punching to forming and precision Fully automatic production. 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.

　　Stamping is mainly classified by process, which can be divided into two categories: separation process and forming process. The separation process is also called punching, and its purpose is to separate the stamping parts from the sheet along a certain contour line while ensuring the quality requirements of the separated section. The purpose of the forming process is to make the sheet metal plastically deform without breaking the billet to make a workpiece of the required shape and size. In actual production, multiple processes are often applied to one workpiece. Blanking, bending, shearing, deep drawing, bulging, spinning, and correction are the main stamping processes.

The surface and internal properties of the sheet metal used for stamping have a great impact on the quality of the stamped product. The thickness of the stamping material is required to be accurate and uniform; the surface is smooth, without spots, scars, scratches, surface cracks, etc.; uniform yield strength , No obvious directionality; high uniform elongation; low yield ratio; low work hardening.