Technical requirements for metal stamping parts
1. Chemical analysis and metallographic inspection analyze the content of chemical elements in the material, determine the level and uniformity of the material's grain size, evaluate the level of free cementite, banded structure and non-metallic inclusions in the material, and check the material shrinkage, Defects such as looseness.
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 quality certificates, which ensure 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. Formability test Conduct bending test and cupping test on the material, determine the work hardening index n value and plastic strain ratio r value of the material, etc. In addition, the steel sheet formability test method can be in accordance with the thin steel sheet formability and test methods. get on.
4. Hardness testing The hardness testing of metal stamping parts adopts Rockwell hardness tester. Small stamping parts with complex shapes can be used to test the surface is very small, which cannot be tested on an ordinary desktop Rockwell hardness tester.