Technical requirements for stamping parts
Technical requirements for stamping: the use of raw materials for stamping parts and precision stamping parts must be in accordance with GB 710-710 “technical conditions for high quality carbon steel sheet”, GB 2517-81 general structure and strip of steel strip, GB 2521-81 cold rolled electrical steel strip and other metal material standards, and meet the material supply status or other requirements. Stamping certificate should be the quality of raw materials, which ensure that the materials meet the technical requirements. When there is no quality certificate or other reasons, the stamping factory shall select raw materials for re inspection according to the needs. Appearance inspection: check the surface defects, stains, outline size, shape and thickness of the material and the surface roughness of table σ. Materials for chemical analysis, metallographic examination and chemical element content analysis; Determination of material particle size and uniformity, evaluation of material free cementite, banded structure and non-metallic inclusion level; shrinkage cavity and other defects; inspection of material porosity. The tensile strength, yield strength, σ σ B of the material mechanical property test show σ age / σ, elongation Delta, area reduction B position and Rockwell hardness HRB, etc., forming property test, bending test, cupping test, determination of strain hardening index n value and plastic strain ratio R value of the material, etc. As for the test method of the formability of steel plate, the formability and test method of sheet metal are specified. Other performance measures: electromagnetic properties of materials and coatings determination, coating adhesion, etc.