glossary
Edge Rollover — Industry Glossary Entry
Definition of edge rollover in industrial cutting: deformation of the edge where the substrate pushes the steel over instead of cutting it.
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Edge Rollover is the deformation of a cutting edge where the substrate pushes the steel over instead of cutting it cleanly. The rolled edge looks like a wire edge that has folded over, usually visible as a bright lip on the back face of the knife.
Common causes
- Hardness too low for the substrate (HRC 56 cutting 304 stainless)
- Edge operating above its tempering temperature (D2 above 450 °C)
- Impact load on a soft knife
- Repeated thermal cycling (thermal fatigue plus rollover)
Fixes
- Increase hardness by 2–4 HRC points
- Move to a hot-hardness steel (M2 HSS)
- Add a hot-hardness coating (TiAlN, AlCrN)
- Add active cooling to drop edge temperature below tempering point
See also.
