CUTTING TOOL MADE OF SURFACE COATED CEMENTED CARBIDE HAVING HARD COATED LAYER EXHIBITING EXCELLENT CHIPPING RESISTANCE IN CUTTING MATERIAL HARD TO CUT

摘要

PROBLEM TO BE SOLVED: To provide a cutting tool made of surface coated cemented carbide having a hard coated layer exhibiting excellent chipping resistance in cutting a material hard to cut. SOLUTION: In the cutting tool made of surface coated cemented carbide, a hard coated layer formed of following layers (a) to (c) is formed on the surface of a tungsten carbide-base body or a titanium carbide nitride-base cermet base body: (a) a lower layer formed of (Ti, Al)N layer having an average layer thickness ranging from 1 to 5μm and satisfying the composition formula: (Ti1-XAlX)N (wherein X is 0.30 to 0.70 in an atomic ratio); (b) an inter-layer contact layer formed of a vanadium nitride layer having an average layer thickness ranging from 0.1 to 1.5μm; and (c) an upper layer formed of a vanadium oxide layer having an average layer thickness ranging from 1 to 5μm. COPYRIGHT: (C)2007,JPO&INPIT