The surface canning cutting tool null tungsten carbide basis which shows the resistance blade tipping Characteristic where the hard enveloping layer is superior in high-speed

摘要

PROBLEM TO BE SOLVED: To provide a surface coated cutting tool having hard coating layer exhibiting superior chipping resistance and wear resistance in high-speed intermittent cutting in which high heat is generated and impact is applied to a cutting blade.;SOLUTION: In this surface coated cutting tool, the following layers are formed on the surface of a tool base body. A modified Ti based carbonitride layer having a close adhesive Ti compound layer and a longitudinal growth crystal structure is formed as a lower layer, and a hard coating layer made of Al₂O₃ layer is formed as an upper layer. The modified Ti based carbonitride layer shows crystal orientation such that in the case of measuring an angle of inclination made by a normal of {112} face and a normal of {110} face, which are crystal planes of a crystal grain to a normal of a surface polishing face, by applying electron beams to individual crystal grains having cubic crystal lattice, which exist within the measuring range of the surface polishing face using a field emission type scanning electron microscope, and obtaining the total area A and the total area B of the respective crystal grains whose {112} face and {110} face have inclination angles in the range of 0-10 degrees to the normal of the surface polishing face, A/B is 2-9.;COPYRIGHT: (C)2009,JPO&INPIT