COATED CEMENTED CARBIDE TOOL

摘要

PROBLEM TO BE SOLVED: To provide a coated cemented carbide tool capable of improving both toughness and abrasion resistance with favorable balance to achieve longer service life. SOLUTION: This coated cemented carbide tool is provided with a hard coat layer on cemented carbide base material having a chip breaker part and a land part at a rake face connected to a cutting edge ridge line part. On a surface layer part of the base material, a de-βlayer without hard phase other than WC is provided. Thickness of the de-βlayer is 50μm or less as an average for the whole body of the tool. An average thickness of the de-βlayer at the land part is xμm, and an average thickness of the de-βlayer at the chip breaker part is yμm, then 2<=(x+y)/2<=40 and 2<=y-x<=20 are satisfied. The average thickness of the de-βlayer at the chip breaker part is set thicker than the land part to provide the land part with abrasion resistance, and the chip breaker part with defective resistance.