SURFACE COATED CUTTING TOOL EXCELLENT IN CHIPPING RESISTANCE AND WEAR RESISTANCE

摘要

PROBLEM TO BE SOLVED: To provide a surface coated cutting tool of which a hard coated layer exhibits chipping resistance and wear resistance in high-speed intermittent cutting conditions.SOLUTION: In a surface coated cutting tool coated with a lower layer of Ti compound layer and an upper layer of TiAlCN layer, such inclination angle number distributions that inclination angles of normals on {110} faces of crystal grain of the Ti compound layer having 1 μm or more and an average layer thickness of 50% or more of the total average layer thickness of the lower layer and crystal grain of the TiAlCN layer of the upper layer for the normal direction of a base body surface fall into the range of 0 to 10° are respectively 30% or more, a TiAlCN crystal grain of which an inclination angle of the normal on {110} face for the normal direction on the base body surface falls into the range of 0 to 10° exists on an area on the upper layer corresponding to the maximum width of the direction parallel to the base body surface of the crystal grain of the Ti compound layer and the crystal grains occupy an area of 50% or more for the total area of TiAlCN crystal grains of which an inclination angle of the normal on {110} face for the normal direction on the base body surface falls into the range of 0 to 10°.SELECTED DRAWING: Figure 1