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

摘要

PROBLEM TO BE SOLVED: To provide a cutting tool made of surface coated cemented carbide having a coated layer exhibiting excellent chipping resistance in high-speed cutting of hard-to-cut material.;SOLUTION: In this cutting tool made of surface coated cemented carbide, a hard coated layer formed by following (a) to (c) is formed on the surface of a tungsten carbide-base cemented carbide or a titanium carbide nitride-base cermet : (a) a lower layer formed formed of (Ti, Al, Si)N layer having an average layer thickness ranging from 1 to 5 μm, in which Al maximum content point and Al minimum content point alternately exist repeatedly at predetermined intervals in the direction of layer thickness, having a component concentration distribution structure in which Al and Ti contents respectively continuously change from the Al maximum content point to the Al minimum content point and from the Al minimum content point to the Al maximum content point, the Al highest and lowest containing points satisfy a specific composition formula, and the interval between the adjacent Al maximum and minimum content points ranges from 0.01 to 0.1μm; (b) an adhesive bonding layer formed of CrN layer; and (c) an upper layer formed of Cr dispersed Cr₂O₃ layer.;COPYRIGHT: (C)2007,JPO&INPIT