Scrap jumping is a common issue in stamping production. It would cause dent in stamping parts or even damage the tooling. But why does scrap jumping exist? The reasons are listed below:
- Trimming steel wear, and the cutting clearance is bigger;
- Scrap go up along the trimming punch because of punch magnetism or oil adhesion;
- Scrap go up because of vacuum pressure when the trimming punches move upwards;
- Add ejectors on the punch if there is enough space;
- Add vent hole in the punch if there isn’t enough space, and use pressed air to blow away the scrap;
- Make the bottom surface of the punch uneven, so the scrap would deform when being punched;
- Make the shape of trimline irregular so there would be bigger resistance to prevent the scrap from coming up;
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