COATED SINTERED HARD ALLOY TOOL

摘要

PURPOSE:To obtain a stable cutting tool of a coated sintered hard alloy having a long life by coating the surface of a substrate of a sintered hard alloy with a substance having higher hardness than the substrate to form a cutting tool having a coating film and by removing a part of the film close to the angle of the cutting edge at the rake surface side and the flank side under specified conditions. CONSTITUTION:The surface of a substrate 4 of a sintered hard alloy contg. WC, TiC or the like is coated with a substance having higher hardness and wear resistance than the substrate 4 and contg. the carbide of a IVa or Va group metal in the periodic table to form a cutting tool having a coating film 5. A part of the film 5 is removed at the rake surface side C and the flank side D by 10-100mum width W estimated from the side C. Thus, not only the strength of the cutting edge but also the wear resistance is improved.