In the stamping die, the use of various metal materials and non-metallic materials, mainly carbon steel, alloy steel, cast iron, cast steel, cemented carbide, low melting point alloy, zinc base alloy, aluminum bronze, synthetic resin, polyurethane rubber, plastic, laminated birch wood.
The materials for manufacturing molds require high hardness, high strength, wear resistance, suitable toughness, high hardenability and heat treatment without deformation (or less deformation) and not easily cracked when quenching.
reasonable selection of mold materials and the implementation of correct heat treatment process is the key to ensure the die life. For the use of different molds, should be based on their working status, stress conditions and the properties of the processed materials, production volume and productivity, and other factors, and the performance of the above requirements are emphasized, and then make the appropriate selection of steel and heat treatment technology.
When the production batch of stamping parts is very large, the mould steel with high quality and good abrasion resistance should be selected for the mold and die material of the working parts. For other parts of the mold and the auxiliary structure part of the material, also should be improved accordingly. When the batch size is not large, the requirement of material performance should be relaxed appropriately to reduce the cost.
When the pressed material is harder or the deformation resistance is large, the convex and concave die of the die should choose the material with good abrasion resistance and high strength. When drawing stainless steel, aluminum bronze die can be used, because it has good adhesion resistance. The Guide-pillar Guide sleeve requires wear resistance and good toughness, so the use of Low-carbon steel surface carburizing quenching. Another example, carbon tool steel is the main lack of hardenability, in the die parts of the larger section size, quenching its center hardness is still low, but, in the stroke of a large pressure bed work, because of its good impact resistance has become the advantage. For the fixed plate, unloading board parts, not only to have sufficient strength, but also required to work in the process of small deformation. In addition, cold and cryogenic treatment, vacuum treatment and surface hardening can be used to improve the performance of the die parts. For the cold extrusion die with poor working condition of convex and concave die, the die steel with good comprehensive mechanical properties such as hardness, strength, toughness and abrasion resistance should be selected, and it should have certain red rigidity and thermal fatigue strength.