CEMENTED CARBIDE-MADE CUTTING TOOL WITH SURFACE CLAD EXERTING EXCELLENT CHIPPING RESISTIVITY IN HIGH VELOCITY CUTTING PROCESSING

摘要

PROBLEM TO BE SOLVED: To provide a cemented carbide-made cutting tool with a surface clad exerting excellent chipping resistivity in high velocity cutting processing. SOLUTION: The cemented carbide-made cutting tool with the surface clad is made by that the phase of silicon nitride is used to physically and vaporously deposit the layer of hard cladding having a structure distributed dispersedly at the rate of 0.3 to 10 area % in a superficial analysis by the device of an auger spectroscopic analysis in the layer thickness of 0.8 to 15μm on an untreated surface comprising the composite nitride of Ti and Al having a chemical formula: (Ti1- XAlX) N (however, X shows 0.45 to 0.75 by atomic ratio) on the surface of the cemented carbide substrate of a tungsten carbide formula or the cermet substrate of a titanium nitride carbide system.