CUTTING TOOL MADE OF SURFACE COVERING CEMENTED CARBIDE AND HAVING THICK ARTIFICIAL DIAMOND COVERING LAYER HAVING SUPERIOR PEELING RESISTANCE

摘要

PROBLEM TO BE SOLVED: To produce no peeling of a thick artificial diamond covering layer though the artificial diamond covering layer is in a thick film state in high-speed cutting as well as continuous cutting and intermittent cutting under ordinary conditions. SOLUTION: A cutting tool made of a surface covering cemented carbide is composed by forming a thick artificial diamond covering layer having an average layer thickness of 10-50μm on the surface of a cemented carbide base composed of a tungsten carbide group cemented carbide. A continuous and/or discontinuous laser beam-machined notched vertical narrow groove having depth in the range of 1/2-1.5 times of the average layer thickness of the thick artificial diamond covering layer is formed on over an entire cutting edge local surface of at least any one of a cutting edge ridge line part intersecting the cutting face with the flank, the cutting face, or the flank.