What Are The Reasons For The Appearance Of Stars On The Surface Of Metal Stamping Parts?

The surface stars of metal stamping parts refer to the small bumps on the surface of large panel parts during stamping production. When checking the appearance quality of metal stamping parts with oilstone, you can see the small bright spots on the surface. These tiny defects will cause light clutter and irregular reflection after coating, which will affect the appearance quality.
1. The surface of raw materials is dirty due to the uncleanness of the material surface or the uncleanness of the cleaning oil;
2. Dirty surface of raw materials caused by poor storage or long-term storage of materials after uncoiling and blanking;
3. The mold of metal stamping parts is not cleaned or the mold is not cleaned in time, resulting in dirty mold surface;
4. The raw material of metal stamping parts is dirty on the base metal surface before hot galvanizing;
5. The chrome coating on the surface of the metal stamping die is damaged after long-term production, and the material surface is dezincified due to the friction between the die and the material surface during drawing;
6. The dust-proof conditions in the production workshop of metal stamping parts are not good, and dust falls on the material surface and mold surface at the production site;
7. During the handling and production of metal stamping parts, when workers wear ordinary protective gloves to work, the scurf generated by the friction between the ordinary protective gloves and the sheet metal falls into the material surface and the mold surface;
8. The cutting powder generated in the trimming and punching process of metal stamping parts enters the mold.