METHOD FOR FORMING HARD COVERED LAYER TO DEMONSTRATE EXCELLENT CHIPPING RESISTANCE IN INTERMITTENT DOUBLE CUTTING ON SURFACE OF CUTTING TOOL

摘要

PROBLEM TO BE SOLVED: To provide a method for forming a hard covered layer to demonstrate excellent chipping resistance in the intermittent double cutting on a surface of a cutting tool.;SOLUTION: The inside of an arc ion plating device is the atmosphere of gaseous nitrogen, and arc discharge is generated between a Ti-Y alloy cathode electrode and a metal Ti cathode electrode which are disposed facing each other across a rotary table and anode electrodes which are continuously provided on these cathode electrodes. The hard covered layer formed of a complex nitride of Ti and Y in which points containing maximum Y-composition and points containing no Y-composition are alternately and cyclically present at predetermined intervals along the thickness direction, the points containing maximum Y-composition satisfy the composition formula: (Ti_1-XYX)N (X is 0.005 to 0.045 in terms of the atomic ratio), and the space between the point containing maximum Y-composition and the point containing no Y- composition adjacent to each other is 0.01-0.1 μm, is physically vapor-deposited with the total mean layer thickness of 1 to 15 μm on the surface of the cutting tool rotating while rotated on the rotary table.;COPYRIGHT: (C)2003,JPO