| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a surface-coated cutting tool that exhibits a superior chipping resistance in the heavy interrupted cutting having a long interval of interruption and a heavy impact applied on a cutting edge tip.SOLUTION: A surface-coated cutting tool that exhibits a superior chipping resistance in the heavy interrupted cutting is formed by covering (a) a Ti compound layer containing at least one TiCN layer as a lower layer, and (b) an aluminum oxide layer as an upper layer, on the surface of a tool substrate constituted of a WC-based cemented carbide or a TiCN-based cermet, as a hard coating layer. The surface-coated cutting tool is constituted of the TiCN layer showing an atom sharing lattice point distribution in which a distribution ratio ofΣ3 is 5-13% in a cutting edge ridge line part, and the distribution ratio ofΣ3 accounts for 50% or more in the region other than the cutting edge ridge line part, when finding the atom sharing lattice point distribution by using a field emission scanning electron microscope and an electron backscattering diffraction image device about the TiCN layer.</p> |
