How to reflect the processing quality of metal stamping parts?
- What are the aspects of the processing quality of metal stamping parts?
1. Chemical analysis, metallographic examination
Analyze the content of chemical elements in the material, determine the particle size level and uniformity of the material, evaluate the level of free cementite, banded structure and non-metallic inclusions in the material, and inspect the material for defects such as porosity.
2. Material inspection
The materials for stamping parts are mainly hot-rolled or cold-rolled (mainly cold-rolled) metal sheet and strip materials. The raw materials of metal stamping parts should have quality certificates to ensure that the materials meet the specified technical requirements. When there is no quality certificate or other reasons, manufacturers of metal stamping parts can select raw materials for re-inspection as needed.
3. Formability test
Perform bending test and cupping test on the material to determine the work hardening index n value and plastic strain ratio r value of the material. In addition, the test method for the formability of the steel plate can be carried out according to the provisions of the formability and test method of the thin steel plate.
4. Hardness test
The hardness test of metal stamping parts adopts Rockwell hardness tester. Small stampings with complex shapes can be used for small test planes and cannot be tested by ordinary desktop Rockwell hardness testers.
5. Measurement of other performance requirements
Determination of electromagnetic properties of materials and adhesion to coatings and coatings.
The technical requirements for processing metal stamping parts are shared with you here. In addition, it should be noted that the accuracy and surface condition of hot metal stamping parts are lower than those of cold metal stamping parts, but they are still better than castings and forgings, and the amount of machining is less.