The difference in the process is: stamping is the cold extrusion forming process of thin plates; cold forging is the forming process below the recrystallization temperature of the material; hot forging is the forming process above the recrystallization temperature of the material; In injection molding, the liquefied metal is cooled and formed in a mold. As for the machining accuracy, it also depends on the design requirements. Generally speaking, die casting and cold forging are relatively high, but the quality is reliable.

After the zinc alloy die casting in the middle of the twentieth century, there are green sand high pressure molding, chemical hardening sand molding and core making, forming and other special vacuum casting, shot blasting and other new technologies, which have high shape, dimensional accuracy and surface The finish is good, and the working conditions and sanitation of the foundry are also greatly improved.