Sandvik Coromant Parting and grooving - users guide - Manual (Page 73)

71
Grades
To cover all types of workpiece materials the CoroCut family has a variety of different car-
bide grades - from the highly wear resistant GC3115 to the toughest grade on the market
GC2145. Cubic boron nitride (CB7015) and diamond (CD10) tipped inserts are also avail-
able.
These grades have been developed to cope with the most complex of parting and grooving
applications.
It is important to detect if the grade is too wear resistant (hard) or too tough (soft), by
inspecting the edge line behaviour.
Edge line having early plastic deformation (PD), see the illustration, indicates the grade is too
tough and a more wear resistant grade should be used.
Edge line having early chipping (small carbide pieces broken out of edge line), see the illustra-
tion, indicates the grade is too wear resistant and a tougher grade should be used.
See also the different wear mechanisms on page 76.
Plastic deformation. Chipping.
Toughness
W
ear
resistance
Unstable
Stable
conditions
Practical hints