In our daily life, metal stamping parts are everywhere. So how does the metal stamping parts factory ensure the quality of the metal stamping parts? You can basically know the quality of the metal stamping parts by seeing whether the metal stamping manufacturers can do the following points.

1. Chemical analysis and metallographic examination

Material analysis, the content of chemical elements determines the level of grain size and uniformity of the material, the evaluation of free cementite in non-metallic inclusions, the band structure and level, and the inspection of material shrinkage, pores and other defects.

2. Material inspection

The processing materials of metal stamping parts are mainly hot-rolled or cold-rolled (mainly cold-rolled) sheet metal materials. The raw material certificate of metal stamping parts should have quality assurance to ensure that the materials meet the technical requirements. When there is no quality certificate or other reasons, the metal stamping parts manufacturer can select the raw materials that need to be re-inspected according to the requirements.

3. Formability test

Perform bending test and cupping test on the material, and measure the material strain hardening index n value and plastic strain ratio r value, etc. In addition, for the test method of the formability of the steel plate, the formability and test method of the sheet metal shall be specified.

4. Hardness testing

The hardness test of metal stamping parts adopts Rockwell hardness tester. Small, complex shaped metal stampings can be used to test very small flat surfaces that cannot be tested on a standard Rockwell hardness tester.

5. Other performance requirements

Electromagnetic properties of materials and determination of coating-to-coating adhesion.