SURFACE-COATED CUTTING TOOL HAVING HARD COATED LAYER SHOWING EXCELLENT CHIPPING RESISTANCE AND WEAR RESISTANCE IN HIGH-SPEED HEAVY CUTTING MACHINING OF HEAT-RESISTANT ALLOY

摘要

PROBLEM TO BE SOLVED: To provide a surface coated cutting tool having a hard coated layer showing excellent chipping resistance and wear resistance in high-speed heavy cutting machining of heat-resistant alloy.;SOLUTION: The surface coated cutting tool has an average layer thickness of 1 to 8 μm on a surface of a tool base body made from tungsten carbide base cemented carbide or titanium carbonitride base cermet, and is coated with a composition changing (Al, Cr, Ti, Si, B) N layer wherein the Al-Ti-Si maximum containing points and the B maximum containing points alternately and repetitively exist at predetermined intervals. The content of Al, Cr, Ti, Si, and B at the Al-Ti-Si maximum containing point is respectively 0.40-0.60, 0.20-0.40, 0.05-0.20, 0.01-0.10, and 0.01-0.10. The content of Al, Cr, Ti, Si, and B at the B maximum containing point is respectively 0.05-0.20, 0.25-0.45, 0.01-0.07, 0.001 to 0.03, and 0.40-0.55.;COPYRIGHT: (C)2008,JPO&INPIT