Why is the surface quality of metal stampings 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 clamping, taking and unloading of station instruments may also damage the surface quality of the parts. Therefore, the details should be fully considered in each link of the entire manufacturing process to avoid quality problems and affect the final product appearance.

1、 Common undesirable phenomena of coiled materials mainly include the following aspects:

1. There are foreign matters on the surface or inside of the steel plate.

2. The foreign body peels off, and the coiled material is in scar like state; The coiled material is poor.

3. The edges and corners of the roll are damaged.

4. The corners (20~30mm) are deformed or wrinkled due to uneven stress.

5. Scratches (caused by roller surface or foreign substances).

6. The roller slips.

7. The edge is irregular and damaged.

8. After the foreign matters enter, press out the bulge on the back of the coil (if the foreign matters fall, they will disappear).

9. Roller trace (caused by foreign matters attached to the roller).

10. Poor materials beyond the rules.

The above details accurately explain why the surface quality of metal stamping parts is poor. In addition, the obvious groove mark on the surface depth caused by foreign matters is also the main reason for poor surface quality of metal stamping parts. According to practical experience, among the above contents, 5, 8 and 9 items are the most frequent parts with poor performance or causes.