After bending, the bending angle has cracks


  1. The inner radius of bending is too small.
  2. The material grain direction is parallel to the bending curve
  3. The burr side of the blank is outward
  4. Poor plasticity of metals

terms of settlement:

  1. Increase the bending radius of punch.
  2. Change blanking layout.
  3. The burr is changed to the fillet of the workpiece.
  4. Anneal or use soft materials.

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