The main materials used for die casting are metal materials, such as plain carbon steel, high-quality carbon steel, stainless steel and brass plates (belts), aluminum plates (belts), etc., and sometimes non-metallic materials such as plywood, plastic and fiberboard. The materials used for die casting are mostly bars, strips, coils and blocks of various sizes, and sometimes some profiles and pipes are stamped.
The materials used for die casting must not only meet the design requirements of the parts but also the die casting properties of the materials. The die casting properties of materials refer to their adaptability to various die casting processes, i.e. good plasticity,
Easy to process, easy to get high quality and high precision die casting parts, high production efficiency, low loss of dies, not easy to scrap, etc.
The die casting properties of metal materials are analyzed by comparing the mechanical indices of various materials. The main strength index of mechanical properties is the yield strength of the material.σS, tensile strengthσB. Yield-strength ratioσS/σB necking stressσJ. Fracture stressσF. The ratio of elastic modulus E to yield strength E/σS, plasticity index has the total elongation of the materialδ、Uniform shrinkageδU. Section shrinkageψ、Unilateral shrinkage with uniform deformation ψU etc.
Generally speaking, materialσS/σThe smaller the B value, the smaller the risk of disruption of the formation process, and the E/σThe bigger the s value, the smaller the rebound during the forming process of the material. δ and ψThe greater the value, the greater the plasticity of the material before failure.δW,ψW,δW/σ、ψW/ψThe higher the value, the better the temperature properties of the material and therefore its die-casting properties.
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