Six material selection principles for stamping dies
The stamping die is also known as the cold die. It uses the press pressure to act on the die to change the shape of the metal placed in the die. From the function of the die, there are drawing die, blanking die, bending die, riveting die, etc. The working principle of the drawing die is to use the convex and concave die of the same shape to press the metal material through the press plate to process various geometric three-dimensional products according to the design requirements. 1. Production batch When the production batch of stamping parts is large, the materials of the working parts of the die, the punch and the die should be made of die steel with high quality and good wear resistance. The parts materials of other process structure parts and auxiliary structure parts of the mold should also be improved accordingly. When the batch size is small, the requirements for material properties should be appropriately relaxed to reduce costs. 2. Reduce production costs Pay attention to the use of micro-deformation die steel to reduce machining costs. 3. Performance of the stamped material and service conditions of die parts When the material to be punched is hard or has large deformation resistance, the punch and die should 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 4. Material properties The cold and hot workability of the material and the existing conditions of the plant shall be considered. 5. Considering the production and use of moulds in China The selection of mold materials should be determined according to the use conditions of mold parts, so as to select low-cost materials and reduce costs on the premise of meeting the main conditions. 6. Development of special die steel For molds with special requirements, mold steel with special properties shall be developed and applied.