| 摘要 |
The present invention relates to a coated cutting tool insert of cemented carbide with coating including at least one layer of Ti<SUB>1-x</SUB>Al<SUB>x</SUB>N deposited by PVD-tech-nique. The layer has x=0.4-0.6 with a compressive residual stress of >4-6 GPa and a thickness of 1.5-5, preferably 2.5-4 mum. Both the I(111) and I(200) are <7.5, preferably <5, times, the intensity average noise level. Good adhesion despite high compressive stress is obtained if the layer is deposited by cathodic arc evaporation technique at a bias in the range -90<U<-50V, preferably -80V<U<-60V.
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