Surface coating cutting tool

Abstract

The present invention provides a surface coating cutting tool with a hard coating layer, wherein the hard coating layer plays an excellent flaking-proof role in the high-speed intermittent cutting machining operation on alloy steel materials and the like. According to the technical scheme of the surface coating cutting tool, the surface of a substrate is coated with a hard coating layer which is a (Ti1-XAlX) (CYN1-Y) layer of a cubic crystal structure and evaporated through the chemical vapor deposition process with Al(CH3)3 as one component of reaction gases, wherein the atomic ratios of X and Y are as follows: 0.55 <= X <= 0.95, and 0.0005 <= Y <= 0.005. In the hard coating layer, among the inclined angle degree distribution of the inclined angles formed by relative relationship between the normal of the {111} surface of a measured crystal particle and the normal direction of the surface of the substrate, degrees in the range of 2-12 is more than 45% of the total degree, and moreover, in the shared lattice point distribution curve graph of the component atom of the hard coating layer, the distribution proportion of Sigma 3 at the side of the surface of the substrate is less than 20%, on the other hand, Sigma 3 at the side of the surface of the coating layer has the highest peak valve and the distribution proportion of Sigma 3 is more than 50%.

Description

technical field [0001] The present invention relates to a surface-coated cutting tool (hereinafter referred to as a coated tool), in which the hard coating layer is used in high-speed intermittent cutting processing of alloy steel and the like accompanied by high heat generation and impact load acting on the cutting edge. Excellent chipping resistance. Background technique [0002] In the past, the following cladding tools are known, that is, usually made of tungsten carbide (hereinafter, represented by WC)-based cemented carbide, titanium carbonitride (hereinafter, represented by TiCN)-based cermets or cubic boron nitride (hereinafter represented by TiCN) , represented by cBN)-based ultra-high pressure sintered body (hereinafter, these are collectively referred to as the substrate) on the surface of the surface, coated with a Ti-Al composite nitride layer as a hard coating layer by physical vapor deposition, and They are known to exert excellent wear resistance. [0003] ...

AI Technical Summary

Problems solved by technology

[0017] However, in the coated tools described in the above-mentioned Patent Documents 1 and 2, the film formed by the physical vapor deposition method is composed of (Ti 1-X Al X ) The hard coating layer composed of N layer cannot increase the Al content X in the film, so it cannot be said that the chipping resistance is sufficient when it is used for high-speed interrupted cutting of alloy steel, for example.

[0018] On the other hand, the (Ti 1-X Al X ) The N layer can increase the Al content X, and can form a cubic crystal structure, so that a hard coating layer with a specified hardness and excellent wear resistance can be obtained, but the adhesion strength with the substrate is not sufficient, and due to the toughness Poor, when used as a clad tool for high-speed interrupted cutting of alloy steel, abnormal damage such as chipping, chipping, and peeling is prone to occur, and satisfactory cutting performance cannot be said to be exerted

[0019] Moreover, when the coated tool described in the above-mentioned Patent Document 5 is used for continuous cutting of carbon steel, it shows a certain degree of adhesion and wear resistance. During high-speed interrupted cutting, etc., due to chipping, chipping, peeling, etc., satisfactory cutting performance cannot be exerted in long-term use.

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