This guide supports Extramet’s carbide punches by answering the practical engineering and purchasing questions that usually come before an RFQ.
Quick Answer
- Different punch failures point to different fixes.
- Chipping and breakage may indicate impact, alignment, or grade issues.
- Edge wear and galling may indicate material, clearance, finish, or lubrication issues.
| Failure mode | Common cause | Possible response |
|---|---|---|
| Chipping | Unsupported edge or impact | Add support, radius, or tougher grade |
| Galling | Adhesion and poor lubrication | Improve finish, coating, or lubricant |
| Edge wear | Abrasive contact | Review grade and clearance |
| Breakage | Side load or shock | Check alignment and geometry |
Failure diagnosis beats guessing
A carbide punch that chips needs a different response than one that wears slowly. Before changing grade, inspect the failure surface, alignment, clearance, material being punched, and support around the working edge.
Why carbide is sensitive to support
Carbide is hard and wear resistant, but it does not tolerate unsupported impact the way steel can. Proper holder design, shoulder support, edge prep, and clearance help protect the punch.
Use the failure mode in the RFQ
Photos and process notes are useful. They help Extramet understand whether the punch needs a tougher grade, a wear-resistant grade, a geometry change, or a different finishing approach.
What to Include in an RFQ
- failure photos
- stamped material
- clearance and alignment
- current punch material and grade
Related Extramet Resources
Reviewed for technical accuracy: This supporting article was prepared to align with Extramet’s tungsten carbide manufacturing, grinding, inspection, and quality capabilities in Latrobe, Pennsylvania.
Frequently Asked Questions
Why did my carbide punch chip?
Chipping can come from impact, side load, poor edge support, clearance issues, or a grade that is too brittle for the application.
Can a tougher grade solve breakage?
Sometimes, but alignment, support, and geometry should be checked first.
Does surface finish affect galling?
Yes. Finish, lubrication, clearance, and contacted material all influence galling.