After the workpiece is bent, the concave part bottom is uneven

reason:

  1. The material itself is uneven.
  2. The contact area between the top plate and the material is small or the jacking force is insufficient.
  3. There is no ejector in the die.

terms of settlement:

  1. Leveling material
  2. Adjust the jacking device to increase the jacking force
  3. Add jacking device or correct.
  4. Plus shaping process.

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