Why is the punch of stamping die easy to break?

Why is the punch of stamping die easy to break?
In addition to the punch material and the design of the punch itself, what are the causes of the fracture of the punch?
1. Punch hardness is too high, the material of the punch is not right - change the material of the punch, adjust the hardness of heat treatment. cnc machining part
2. The improper positioning of material results in the unilateral cutting of punch, and the uneven fracture of punch due to the uneven force - adjusting the positioning or feeding device.

3. Material does not meet the requirements, resulting in poor angle, resulting in dimensional deviation - material change or re-adjust the gap. cnc turning part
4. The fixed position (splint) of the punch is offset from the guiding position (punch plate). The punch is smoothed up and down by repairing or re-cutting into the block.
5. The punch is not fixed properly, and it moves up and down. Re-fix the punch so that it can not move up and down.

6. The punch blade is not sharp - re-grinding the edge. aluminum part
7. Closure height is too low, punch cut-in edge is too long - adjust the closure height, so that the appropriate length of punch edge.
8. The angle error caused by the misalignment of the die leads to the size deviation - poor adjustment of the closure height or poor angle.
9. Down-die scrap blocked the knife edge, resulting in punch breakage - re-drilling large blanking holes, so that blanking smoothly.
10. Shaping public R angle, in angle and other normal conditions - shaping public R angle.
11. The height of the folding tool is not enough, and the bending punch is too short to fit into the folding tool. Increasing the height of the folding tool results in many bad angles, so that the bending punch can fit into the position of the folding tool as far as possible.
12. The bending speed is too fast, which results in the deformation of the bending root - adjusting the speed ratio control and choosing the reasonable speed.
13. The structure is unreasonable. When the folder is not inserted into the fixed template for stamping, the clearance becomes larger - re-milling the groove and inserting the folder into the template.