Surface coated cutting tool

Abstract

This surface coated cutting tool comprises a hard coating layer on the surface of the tool base body which is made from any of a tungsten carbide-based cemented carbide, a TiCN-based cermet, a cubic boron nitride sintered body, and a high-speed tool steel, the hard coating layer containing at least a composite nitride layer of Al, Cr, Si and Cu that has an average layer thickness of 0.5-8.0 [Mu]m,wherein the composite nitride layer satisfies 0.15<=a<=0.40, 0.05<=b<=0.20 and 0.005<=c<=0.05 when represented by the compositional formula (Al1-a-b-cCraSibCuc)N (wherein a, b and c are atomic ratios), and the composite nitride layer comprises crystals primarily having a hexagonal structure, and has a 1.0-3.5 degrees half value width of the diffraction peak in the (110) plane present in the rangein which 2[Theta] is 55 degrees to 65 degrees calculated by x-ray diffraction.

Description

technical field [0001] The invention of the present application relates to a surface-coated cutting machine that exhibits excellent chipping resistance and wear resistance in the hard coating layer and exhibits excellent cutting performance in long-term use in the cutting process of high-hardness materials such as hardened steel. Tool (hereinafter referred to as coating tool). [0002] This application claims priority based on Patent Application No. 2015-211483 filed in Japan on October 28, 2015 and Patent Application No. 2016-209194 filed in Japan on October 26, 2016, and the contents thereof are incorporated herein. Background technique [0003] In general, as cladding tools, there are known indexable inserts that are detachably attached to the front end of a turning tool for use in turning or face milling of workpiece materials such as various steels or cast iron, and for the workpiece materials. Drills or small drills used in drilling and cutting, end mills used in face...

AI Technical Summary

Problems solved by technology

However, under the cutting conditions accompanied by high heat generation and a large impact and mechanical load on the cutting edge, chipping, chipping, etc. cannot be avoided. For example, even if it is intended to increase the proportion of Cr The improvement of high temperature toughness and high temperature strength also reduces the wear resistance due to the relative reduction of Al content

Therefore, there is a limit to the improvement of chipping resistance and wear resistance in the hard coating layer composed of (Al, Cr, Si)N layers.

[0016] On the other hand, in the conventional coated tools shown in Patent Documents 2 to 4, it is proposed to contain Cu as a component of the hard coating layer and improve the wear resistance by making the crystal grains finer. Grinding properties are improved, but the tool life is still short because the chipping cannot be suppressed due to the decrease in toughness

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