1. The forming die punch is too sharp, resulting in material cracking. The forming punch shall be trimmed with R angle, and the knife edge shall be properly trimmed with R angle.
2. The forming punch is not long enough, resulting in the failure to calculate the correct length of the forming punch. Adjust the actual length of the punch to meet the forming requirements.
3. The forming punch is too long, and the material at the forming part is deformed. The correct length of the punch must be determined, and the actual length of the punch must be adjusted to meet the requirements until the punch breaks.
4. Insufficient material at the forming part causes tensile cracking. Calculate the developed material, or modify the R angle, or reduce the forming height.

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