The stamping process can be roughly divided into two major categories: separation process and forming process (subdivided by bending, deep drawing, and forming). The separation process is to separate the stamping part and the blank along the certain contour line during the stamping process, and the quality of the stamping part's separation section must also meet certain requirements; the forming process is to make the stamping blank undergo plastic deformation under the condition of not destroying. And converted into the required shape of the finished product, it should also meet the requirements of dimensional tolerance and other aspects.
There are cold stamping and hot stamping methods according to the stamping temperature. This depends on the material's strength, plasticity, thickness, degree of deformation, and equipment capabilities. It should also consider the original heat treatment conditions and end-use conditions of the material.
1. Cold stamping metal processing at room temperature, generally suitable for blanks less than 4mm in thickness. The advantages are no heating, no oxide scale, good surface quality, easy operation and low cost. The disadvantages are the work hardening phenomenon, which causes the metal to lose its ability to deform further. Cold stamping requires that the thickness of the billet is uniform and the fluctuation range is small, the surface is smooth, no spots, no scratches, etc.
2. Hot stamping A stamping process that heats the metal to a certain temperature range. The advantages are that the internal stress can be eliminated, the work hardening can be avoided, the plasticity of the material can be increased, the deformation resistance can be reduced, and the power consumption of the device can be reduced. (Source: China Machinery Network)