No matter what the problem is, if we want to solve the problem, the first thing is to find out the cause of the problem, so that we can solve the problem according to the order. If we only solve the surface problem, then we believe that it will recur in a short time. Then we will understand what causes the uneven shape of stamping and drawing parts?
- There is no air hole on the punch.
In the stamping process, the air in the workpiece is compressed by the punch and can not be discharged, which makes the shape of the drawing part uneven. This reason is often ignored by many people. The solution is to add air holes on the punch.
- The blank is not smooth.
The surface of the blank is not smooth, which leads to the surface unevenness of the drawing part. The solution is to replace the material with good surface quality.
- The material has large rebound.
The springback of material is large, resulting in uneven shape of drawing parts. The solution is to increase annealing or shaping process.
- The gap between punch and die is too large.
If the gap is too large, the working surface of the die will lose the straightening effect on the workpiece wall, and the workpiece shape will be uneven. Therefore, the die gap should be repaired or replaced with new parts.
- The negative deviation of material thickness is too large.
If the thickness of the material is too small, the gap between the dies will be relatively large, resulting in uneven shape. It is necessary to change the material with proper thickness.
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