Metal stamping processing of raw material requirements and testing

Chemical analysis, metallographic examination, content of chemical element in the analysis of materials; Determine level of material grain size and uniformity; Evaluation materials free cementite, banded structure and nonmetallic inclusions level; Check the material defects such as shrinkage cavity, porosity. Forming performance test, bending test, cupping test was carried out on the material, the determination of material strain hardening index n value and plastic strain ratio r value, etc. About steel sheet formability test method, according to the provisions of the sheet metal forming performance and test methods. Other performance measurement: the electromagnetic properties of the materials and the determination of coating, coating adhesion ability, etc. Hot metal stamping parts precision and surface state is lower than the cold metal stamping parts, but it's still better than the castings, forgings, cutting processing capacity. Metal stamping parts and castings, forgings, compared with a thin, uniform, the characteristics of light and strong. Stamping can make other methods are difficult to manufacture with rib stiffener, flanging, ups and downs, or artifacts, in order to improve its stiffness. Because use precision mould, workpiece precision can reach micron grade, and repeat precision is high, the specification is consistent, can punch a hole nest, convex sets, etc. A: on the characteristics of precision stamping of metal stamping parts