How are the appearance defects of metal stamping sheet metal parts defined?

After the stamping parts are processed, the stamping parts processing plant must conduct an appearance inspection of the metal stamping parts. Only after the inspection is qualified can the stamping parts be packaged and shipped. So how is the defect of the stamping sheet part defined? Let’s take a look below; 1. Discoloration of metal stamping parts: the background color or expected color has changed, or the color of the surface of the parts is inconsistent; 2. Rainbow effect: galvanizing may cause discoloration or 'rainbow' effect; 3. Stamping parts When exposed to the air, chemical reactions such as rust and oxidation occur; 4. The surface of the metal stamping parts is strip-shaped shallow grooves and other defects; 5. Indentation: the groove marks on the surface of the metal stamping parts caused by scratches by sharp objects; 6. Defects such as ripples or strips on the surface of the parts caused by the uneven thickness of the coating 7. The defects of the material itself, such as small pits, bends and other traces, 8. The dirt generated during the manufacturing process and left on the surface of the stamping parts ; (Not cleaned); 9. All unexpected foreign bodies on the painted surface or the surface of stamping parts, such as spots, sand, etc. 10. Pits: crater-like defects on the surface of metal stamping parts; 11. Molding marks: due to forming molds Process marks caused on the surface of parts; article recommendation: stamping parts processing plants should regularly maintain molds, what are the specific areas? Previous post: What are the three major elements in stamping parts processing?