Page 565 - Ceratizit Catalog

Types of wear
B238

Built-up edge

Reasons
○ Cutting speed too low
○ Rake angle too small
○ Wrong cutting material
○ Lack of cooling / lubrication

Remedies
○ Increase cutting speed
○ Increase rake angle
○ Apply TiN-coating
○ Use emulsion with higher concentration

Built-up edge occurs when the chip is not evacuated properly due to
insufficient cutting temperature.

Notching

Reasons
○ Cold work hardening materials (e.g. super alloys)
○ Cast and forging skin
○ Formation of burrs
Remedies
○ Decrease cutting speed
○ Climb milling
○ Change working orientation of the milling cutter
○ Reduce approach angle

Notch at the maximum cutting depth.

Insert breakage

Reasons
○ Excessive stress of the carbide grade
○ Lack of stability
○ Corner angle too small
○ Excessive notching
○ Sudden changes of cutting forces

Remedies
Milling / Technical information
○ Use tougher cutting material
○ Use protective edge chamfer
○ Increase edge hone
○ Use more stable geometry
Excessive stress of the insert causes breakage. ○ Reduce feed rate