SURFACE COATED CEMENTED CARBIDE CUTTING TOOL HAVING HARD COATED LAYER EXHIBITING EXCELLENT WEAR RESISTANCE UNDER HIGH SPEED HEAVY CUTTING CONDITION

摘要

PROBLEM TO BE SOLVED: To provide a surface coated cemented carbide cutting tool having a hard coating layer exhibiting excellent wear resistance under high speed heavy cutting condition. SOLUTION: This surface coated cemented carbide-made cutting tool is formed by depositing a hard coating layer made of compound carbonic nitride layer of Ti and Zr with the whole uniform layer thickness of 1 to 15μm on the surface of the cemented substrate. In the hard coating layer, the highest content point of carbon and the maximum content point of nitrogen are alternately repeated at designated intervals along the direction of layer thickness. The maximum content point of carbon satisfies the composition formula: (Ti1-mZrm)CxN1-x(wherein by atomic ratios, m: 0.40 to 0.60, x: 0.70=0.90). The maximum content point of nitrogen satisfied the composition formula: (Ti1-mZrm)C1-YNY(wherein by atomic ratios, m: 0.40 to 0.60, Y:0.70 =0.90). The interval between both adjacent points is 0.01 to 0.2μm. COPYRIGHT: (C)2004,JPO