SURFACE-COATED CUTTING TOOL WITH HARD COATING LAYER FOR EXHIBITING EXCELLENT CHIPPING RESISTANCE AND ABRASION RESISTANCE BY HIGH-SPEED INTERMITTENT CUTTING WORK

摘要

PROBLEM TO BE SOLVED: To provide a surface-coated cutting tool for exhibiting excellent chipping resistance and abrasion resistance by high-speed intermittent cutting work.;SOLUTION: A hard coating layer composed of a modified Ti based carbonitride layer having an close adhesive Ti compound layer and a longitudinally growth crystal structure as a lower layer and an Al₂O₃ layer as an upper layer, is formed on a surface of a tool base body. The modified Ti based carbonitride layer indicates crystal orientation being 2-8 in both values of the ratio A/B and A/C of the total area A, the total area B and the total area C of respective crystal grains on which measured inclinations on a {112} surface, a {110} surface and a {111} surface fall within in a range of an inclination of 0-10 degrees to a normal of a surface polishing surface among the measured inclinations, by measuring the inclinations formed by the respective normals of the {112} surface, the {110} surface and the {111} surface being a crystal surface of the crystal grain to the normal of the surface polishing surface, by irradiating an electron beam to the individual crystal grains having a cubic crystal lattice existing in a measuring range of the surface polishing surface, by using a field emission type scanning electron microscope.;COPYRIGHT: (C)2009,JPO&INPIT