
We have been stamping half hard and full hard stainless steel recently and are experiencing more head breakage than we are used to. Is there anything we can do to strengthen the heads of our punches?
When stamping stainless steel, head breakage can be a huge drain on productivity. Wilson Tool offers 3 options to increase tool life and reduce head breakage.
- Add a chamfer to the back of the head. This reduces the diameter on the back of the head to match the diameter of the shank. This will prevent any side loading that may be present due to misalignment.
- Use a backing plate behind the punch with the same hardness as the head on the punch. As we all know the heads on a punch need to be drawn back so they are softer/tougher than the rest of the punch, 40-45 Rc is ideal. Be sure your backing plate matches this Rockwell hardness, often times tool builders will use A2 and heat treat this plate into the high 50’s Rc, this can cause vibration and actually increase head breakage.
- Consider adding a fillet radius under the head. By adding a .015” - .050” radius under the head you will increase the strength of the head substantially. Be sure to allow for the radius in the punch pad for a proper fit.
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