Page 566 - Ceratizit Catalog

Types of wear
B239

Cratering

Reasons
○ Cutting speed and / or feed rate too high
○ Rake angle too shallow
○ Grade with low wear resistance
○ Insufficient coolant supply

Remedies
○ Reduce cutting speed and / or feed rate
○ Increase coolant quantity and / or pressure, optimise
coolant supply
○ Use grade with higher resistance to cratering

The hot chip which is being evacuated causes cratering at the rake face of the
cutting edge.

Plastic deformation

Reasons
○ Too high machining temperature, resulting in softening of
substrate
○ Damaged coatings
○ Chip groove too narrow

Remedies
○ Reduce cutting speed
○ Choose carbide grade with higher wear resistance
○ Provide cooling

High machining temperature and simultaneous mechanical stress can lead to
plastic deformation.

Milling / Technical information