Why is the surface quality of metal stamping parts poor?

Why is the surface quality of metal stamping parts poor? There are many reasons for the surface quality problems of stamping parts. For example, the surface quality of coils, sheets, and molds will affect the quality of the final stamping parts, the operation during the stamping process, and the work position equipment Clamping, removal, etc. may also damage the surface quality of the part. Therefore, in each link of the entire manufacturing process, details should be fully considered to avoid quality problems that affect the appearance of the final product. 1. Common undesirable phenomena of coil materials mainly include the following aspects: 1. There are foreign objects on the surface or inside of the steel plate; 2. The foreign objects are peeling off and the coil is in a scar-like state; the coil is bad 3. The corners of the coil are damaged; 4. Edges The angle (20～30mm) is deformed or wrinkled due to uneven stress; 5. Scratches (caused by the surface of the roller or foreign matter); 6. The roller is caused by sliding; 7. The edge is irregularly damaged; 8. The foreign matter enters the roll The back of the material is pressed out of the bulge (the foreign body will disappear when it falls); 9. The traces of the roller (caused by the foreign matter attached to the roller); 10. The material that exceeds the rules is poor; the above details accurately explain why the surface quality of the metal stamping parts is poor The problem. In addition, there are obvious groove marks on the surface depth caused by foreign matter, which is also the main reason for the poor surface quality of metal stamping parts. According to practical experience, in the above content, items 5, 8, and 9 are the most frequently occurring product defects or reasons.