The surface canning cutting tool null tungsten carbide basis which shows the resistance blade tipping Characteristic which is superior in high-speed continual cutting work

摘要

PROBLEM TO BE SOLVED: To provide a surface coated cutting tool exhibiting excellent chipping resistance in high-speed continuous cutting of hard alloy steel.;SOLUTION: The surface coated cutting tool includes a hard coating layer formed of a lower layer, an intermediate layer, and an upper layer, and formed by vapor deposition on a surface of its tool base, wherein: the lower layer is a Ti compound layer; the intermediate layer is an α-type Al₂O₃ layer with a high (0001) plane orientation rate; and the upper layer is a layer of uniformly mixed structure of an Al₂O₃ phase and a Cr₂O₃ phase, and when the distribution of lattice points sharing one constituent atom (the constituent atom sharing lattice points) is calculated at an interface between mutually adjacent crystal grains on each crystal plane of the mixed structure layer, with "ΣN +1" representing a constituent atom sharing lattice point form in which N lattice points sharing no constituent atom exist between the constituent atom sharing lattice points, a highest peak exists in Σ3 and the distribution rate of Σ3 in the entire "ΣN +1" is 40-60%.;COPYRIGHT: (C)2010,JPO&INPIT