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 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 base body: (a) a lower layer formed of (Ti, Al, B)N layer having an average layer thickness ranging from 1 to 5 μm, and having a component concentration distribution structure in which Al maximum content points and Al minimum content points alternately repeatedly exist at predetermined intervals along the direction of layer thickness, the Al content and Ti content respectively continuously vary from the Al maximum content point to the minimum content point and from the Al minimum content point to the maximum content point, the Al maximum content point and the minimum content point satisfy a specified composition formula, and the interval between the adjacent the Al maximum point and the Al minimum point is 0.01 to 0.1 μm; (b) an inter-layer contact layer formed of a vanadium nitride layer having an average layer thickness ranging from 0.1 to 1.5 μm; and (c) an upper layer formed of a vanadium oxide layer having an average layer thickness ranging from 1 to 5 μm.;COPYRIGHT: (C)2007,JPO&INPIT