High speed of the high hardness steel the surface canning thermet make cutting throwaway tip null tungsten carbide basis which shows the resistance blade tipping Characteristic where the hard enveloping layer is superior heavily

摘要

PROBLEM TO BE SOLVED: To provide a coated cutting chip whose hard coating layer exerts excellent chipping resistance in high speed cut processing of a high hardness steel.;SOLUTION: In one of bottom layers and a top layer of a hard coating layer of a coated cutting chip, an inclined angle formed by normals of a (001) face and a (011) face (bottom layers), which are crystalline faces of crystal grains, and a (0001) face and a (10-10) face (top layers) are measured using an electric field emission type scanning electron microscope. A constitution atom share lattice point distribution graph is made based on the resultant measured inclined angle. The bottom layer and the top layer are constituted by a modified TiCN layer (bottom layer) and a modified Al₂O₃ layer (top layer) showing a constitution atom share lattice point distribution graph where a maximum peak exists in Σ3 and a distribution ratio occupied in the entire ΣN+1 of the Σ3 is 60% or more. The surface of the top layer is polished into a surface roughness of Ra:0.2 μm or less, and a hard coating layer residual stress reducing pattern is formed on the polished surface by laser beam injection.;COPYRIGHT: (C)2008,JPO&INPIT