1. Chemical analysis, metallographic inspection
Analyze the content of chemical elements in the material, determine the grain size level and uniformity of the material, evaluate the level of free cementite, band structure and non-metallic inclusions in the material, and check the material’s shrinkage, porosity and other defects.
2. Material inspection
The materials processed by stamping parts are mainly hot-rolled or cold-rolled (mainly cold-rolled) sheet metal materials. The raw materials of metal stamping parts should have a quality certificate, which guarantees that the materials meet the specified technical requirements. When there is no quality certificate or due to other reasons, the metal stamping parts manufacturer can select raw materials for re-inspection as needed.
3. Forming performance test
Perform bending test and cupping test on the material, determine the work hardening index n value and the plastic strain ratio r value of the material. In addition, the steel sheet forming performance test method can be carried out in accordance with the thin steel sheet forming performance and test method.
4. Hardness testing
The hardness test of metal stamping parts adopts Rockwell hardness tester. Small stamping parts with complex shapes can be used to test the plane is very small, can not be tested on the ordinary desktop Rockwell hardness tester.
5. Determination of other performance requirements
Determination of electromagnetic properties of materials and adhesion to plating and coatings.