When should press brake tooling be reground?
Regrind when the wear land on the punch tip or the die shoulders has become visible, when the bend angle starts to need more correction than before, or when marking appears at the contact points. Wear is gradual, so the trigger is usually a change in the parts rather than a sudden failure.
What are the signs that tooling needs regrinding?
The practical signs are a growing wear land, a bend angle that drifts, marks appearing on the part, and increased tonnage needed for the same job. Any of these means the working surface is no longer the shape it was made to.
| Indicator | What it means |
|---|---|
| Visible wear land on the tip | The tip radius has grown, so the bend radius grows |
| Angle drifting over a run | The effective tool height has changed |
| Marks or galling on the part | Surface damage at the contact points |
| Higher tonnage for the same job | A blunter tip needs more force |
| Inconsistent angle along the length | Uneven wear between segments |
How much material can be removed by regrinding?
Each regrind removes material from the working face, which reduces the overall tool height. The height reduction has to be compensated, either by the tooling setup or by shimming, and there is a limit beyond which the tool must be replaced.
How does regrinding affect the tooling setup?
Reducing the punch height changes the distance between the ram and the die, which changes the bend depth for a given programmed position. The correction is either a shim under the punch or a change in the program.
- Shimming: restore the original height with a precision shim under the punch.
- Program correction: adjust the depth in the controller instead.
- Mixed heights: the biggest problem in practice, because segments reground at different times no longer match.
- Record keeping: mark the amount removed on the tool or in a register.
How should press brake tooling be stored?
Store tooling so the working faces cannot touch each other or rest on a hard surface, in a dry place, with the tool supported on its body rather than its tip. Damage in storage is as common as wear in use.
| Practice | Why |
|---|---|
| Support on the body, never the tip | The tip carries a concentrated load and chips easily |
| Keep segments in sets | Mixed sets give uneven angle along the length |
| Light oil film | Prevents corrosion on ground and polished faces |
| Dry, level rack | Moisture and bending both damage ground tooling |
| Label regrind history | Setup corrections depend on it |
Related technical pages
Tooling hardness and steel grades
Why harder tools wear more slowly and chip more easily.
Troubleshooting
Diagnosing the faults that regrinding is meant to fix.
Tooling setup guide
Seating and aligning a reground tool.
Press brake dies
When a worn die is better replaced than reground.
Next step
Send photographs of the wear land and we will advise whether the tool can be reground or should be replaced.
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