1. First of all, the reason is that the stripper plate is deformed. Solution: the stripper plate needs to be stressed during the material return process, so it is easy to deform after stamping for a certain period of time. At this point, the stripper needs to be reworked or repaired.
2. Secondly, the reason: the design problem of avoiding position inside the mold. Solution: Re-grind the mold to avoid this position.
3. Finally, the reason is that the guide pillar in the mold is pulled off or damaged. Solution: The motion of stripper will be unstable due to strain or damage, and new guide posts need to be replaced.