↑ raise, increase, large influence
⇧ raise, increase, small influence
↓ avoid, reduce, large influence
⇩ avoid, reduce, small influence
≈ check, optimise
◾ use
| Type of wear/workpiece problems | |||||
|---|---|---|---|---|---|
| Flank wear | Crater wear | Notch wear | Cracks at right angles to the cutting edge | Chipping | Solution, measures |
| ↓ | ↓ | Cutting speed vc | |||
| ↑ | ↑ | ↓ | ↓ | ⇩ | Feed f |
| ↑ | ↓ | ⇩ | Depth of cut ap | ||
| ↓ | ⇩ | ↑ | Chamfer angle 35°, heavily interrupted cut | ||
| ↓ | ⇩ | ↑ | Chamfer angle 25°, continuous, slightly interrupted cut | ||
| ↓ | ⇩ | ↑ | Chamfer angle 15°, continuous, slightly interrupted cut |
||
| ↑ | ↑ | Corner radius | |||
| ⇩ | ⇩ | ⇩ | ⇩ | Rounding | |
| ≈ | Tool clamping | ||||
| ≈ | Workpiece clamping | ||||
| ≈ | Overhang | ||||
| ≈ | ≈ | Tip height | |||
| ◾ | ◾ | ◾ | ◾ | Cooling lubricant | |
↑ raise, increase, large influence
⇧ raise, increase, small influence
↓ avoid, reduce, large influence
⇩ avoid, reduce, small influence
≈ check, optimise
◾ use
| Type of wear/workpiece problems | |||||
|---|---|---|---|---|---|
| Insert breakage | Chipping on the surface | Surface quality | Vibration | Burr formation | Solution, measures |
| ⇩ | ↑ | ⇩ | Cutting speed vc | ||
| ↑ | ↓ | ⇧ | Feed f | ||
| ⇧ | Depth of cut ap | ||||
| ↑ | ↓ | ⇩ | ↓ | Chamfer angle 35°, heavily interrupted cut | |
| ↑ | ↓ | ⇩ | ↓ | Chamfer angle 25°, continuous, slightly interrupted cut | |
| ↑ | ↓ | ⇩ | ↓ | Chamfer angle 15°, continuous, slightly interrupted cut | |
| ↑ | ↑ | ↓ | ⇩ | Corner radius | |
| ↑ | ⇩ | ⇩ | ⇩ | ⇩ | Rounding |
| ≈ | ≈ | ≈ | ≈ | Tool clamping | |
| ≈ | ≈ | ≈ | ≈ | Workpiece clamping | |
| ≈ | ↓ | Overhang | |||
| ≈ | ≈ | ≈ | ≈ | Tip height | |
| ◾ | ◾ | Cooling lubricant | |||
| Problem | Possible causes | Solution |
|---|---|---|
| Bar unrounded | Inserts do not sit on the same circumference | Readjust holder, check insert tolerance, use ground inserts if necessary |
| Bar is not inserted centrally in relation to the peeling head | Check position of the guide rollers | |
| Widely varying raw material | Check deviations | |
| Gradations in the surface (sawtooth pattern) |
The secondary cutting edge or one or more inserts is not parallel with the bar | Check the position of the secondary cutting edge and adjust if necessary |
|
Feed/revolution is greater than the length of the secondary cutting edge | Reduce feed |
| Poor insert clamping (dirt in insert seat) |
Check clamping, clean insert seat | |
| Poor chip formation | Feed too low | Increase feed |
| Incorrect chip breaker | Check chip breaker selection | |
| Insufficient coolant | Increase amount of coolant | |
| Chatter marks | Incorrect support chamfer | Check support chamfer |
| Secondary cutting edge too sharp, "hacks into material" | Apply rounding | |
| Cutting edge is too far below the centre | Check height | |
| Guide rollers or jaws set incorrectly | Check setting | |
| Widely varying wear from one insert to the next | Tool is incorrectly set (one insert is working with a larger depth of cut than the others) |
Check tool setting |
| Cutting edge breakage | Incorrect protective cutting edge chamfer | Increase chamfer width, increase chamfer angle |
| Feed too high | Reduce feed | |
| Insufficient rounding | Apply greater degree of rounding | |
| Incorrect grade in use | Make provisions for tougher grade |