What are the principles for the selection of stamping die materials
Stamping die is a special process equipment for processing materials (metal or non-metal) into parts (or semi-finished products) in cold stamping process, which is called cold stamping die (commonly known as cold stamping die). Stamping is a pressure processing method that uses the mold installed on the press to exert pressure on the material at room temperature to make it separate or plastic deformation, so as to obtain the required parts.
1. Production batch. When the production batch of stamping parts is large, the material of the working parts of the mold, the punch and the die, shall be the die steel with high quality and good wear resistance. The material of other process structure parts and auxiliary structure parts of the mold should also be improved. When the batch size is small, the requirements for material properties are required to reduce costs.
2. The performance of the material to be punched and the service conditions of the die parts. When the material to be punched is hard or the deformation resistance is large, the male and female dies of the die shall be made of materials with good wear resistance and high strength. When drawing stainless steel, aluminum bronze concave die can be used because it has good adhesion resistance. The guide post and guide sleeve require wear resistance and good toughness, so the surface carburization and quenching of low carbon steel are often used. For another example, the main disadvantage of carbon tool steel is its poor hardenability. When the section size of die parts is large, its central hardness is still low after quenching. However, when working on a press with a large number of strokes, it becomes an advantage because of its good impact resistance. For parts such as fixed plate and discharge plate, not only should they have sufficient strength, but also they should have small deformation in the working process. In addition, cold treatment and cryogenic treatment, vacuum treatment and surface strengthening can also be used to improve the performance of mold parts. For cold extrusion dies with poor working conditions of male and female dies, select die steel with sufficient hardness, strength, toughness, wear resistance and other comprehensive mechanical properties, as well as certain red hardness and thermal fatigue strength.