CUTTING TOOL MADE OF SURFACE COATED CEMENTED CARBIDE HAVING HARD COATED LAYER EXHIBITING EXCELLENT CHIPPING RESISTANCE IN HARD CUTTING OF 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 hard 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 (d) is formed on the surface of a tungsten carbide-base body or a titanium carbide nitride-base cermet base body: (a) a base body contact layer formed of (Ti, Al)N layer having an average layer thickness ranging from 0.5 to 2μm and satisfying the composition formula: (Ti1-ZAlZ)N (wherein Z is 0.30 to 0.70 in an atomic ratio); (b) a lower layer formed of (Ti, Al, Si)N layer having an average layer thickness ranging from 1 to 5μm and satisfying the composition formula (Ti1-(X+Y)AlXSiY)N (wherein X is 0.40 to 0.70 and Y is 0.01 to 0.20 in an atomic ratio), (c) an inter-layer contact layer formed of a vanadium nitride layer having an average layer thickness ranging from 0.1 to 1.5μm; and (d) an upper layer formed of a vanadium oxide layer having an average layer thickness ranging from 1 to 5μm. COPYRIGHT: (C)2007,JPO&INPIT