Page 8 - CBN_2018
P. 8
Hard Part Turning
CBN INSERTS hard part turning
Why carbide inserts are unsuitable for
It is inadvisable to use carbide inserts for hard
part turning (HPT) due to low chemical stability
between carbide and the hard materials.
The high pressure and high temperatures
generated during HPT cause rapid wear and
short tool life for the carbide insert.
Wear Development
Crater
wear
Flank
wear
Why use PCBN on hardened materials
• Excellent wear resistance
• High toughness
• Suitable for highest surface finish demands
• Maintains close tolerances
• Can replace grinding operations, which
reduces machining cost
• Semi finishing - super finishing
(Depth of cut less than 0.8 mm)
8 ISCAR