SURFACE COATED CUTTING TOOL HAVING HARD COATING LAYER EXHIBITING EXCELLENT CHIPPING RESISTANCE IN HEAVY CUTTING OF DIFFICULT-TO-CUT MATERIAL

摘要

PROBLEM TO BE SOLVED: To provide a surface coated cutting tool having a hard coating layer exhibiting excellent chipping resistance in heavy cutting a difficult-to-cut material. SOLUTION: In this surface coated cutting tool, the hard coating layer including the followings (a) to (c) is formed on the surface of a tool base made of tungsten carbide-base cemented carbide or a titanium carbide nitride-base cermet. (a) a lower layer made of a composite nitride layer of Ti, Al and Si having the average layer thickness of 1 to 5μm and satisfying the composition formula (Ti1-X-YAlXSiY)N (wherein X indicates 0.30 to 0.70 and Y indicates 0.01 to 0.10 by atomic ratio), (b) an interlayer adhesion layer made of vanadium nitride layer having the average layer thickness of 0.1 to 1.5μm. (c) an upper layer having an alternately stacking structure of a vanadium nitride layer and a vanadium oxide layer having an average layer thickness of 0.1 to 1μm per layer and having the total average layer thickness of 1 to 5μm. COPYRIGHT: (C)2007,JPO&INPIT