Layered coated cutting tool

摘要

The present invention relates to a cutting tool insert comprising a body of cemented carbide, cermet, ceramics, cubic boron nitride based material or high speed steel and on which at least on the functioning parts of the surface thereof, a hard and wear resistant coating is applied by cathodic are evaporation. Said coating comprises laminar binary and ternary polycrystalline metal nitrides layers with a repetitive form A/B/A/C/A/B/A/C/... with a total laminar coating thickness of 0.5 to 10 µm. Layer A is MeN and where Me is one or more of the metal element Ti, Nb, Hf, V, Ta, Zr, Cr or Al. Layer B is (Ti 1-x Al x )N, 0.3 < x < 0.95 and layer C is (Ti 1-y Si y )N, 0.04 < y < 0.20. The average thickness of layer A (d A ) is 2< d A < 100nm, layer B (d B ) 4< d B < 150 and layer C (d C ) 4 < d C < 150, essentially constant throughout the coating with a predominantly overall cubic coating structure.