Surface-coated cutting tool and method for producing same

Abstract

This surface-coated cutting tool comprises a substrate and a coating layer which coats the substrate, the coating layer comprising alternating layers obtained by alternately laminating first unit layers and second unit layers upon one another. The first unit layers comprise nitrides containing aluminum and zirconium, and in the first unit layers, the ratio of the number of zirconium atoms if the total number of atoms that constitute the first unit layers is defined as 1 falls within the range of 0.65 to 0.95, inclusive. The second layers comprise nitrides containing titanium and silicon, and the ratio of the number of silicon atoms if the total number of atoms that constitute the second unit layers is defined as 1 is greater than 0 but no more than 0.20.

Description

technical field [0001] The present invention relates to a surface-coated cutting tool and a method of manufacturing the same. This application claims priority based on Japanese Patent Application No. 2018-040875 filed on March 7, 2018. The entire contents described in this Japanese Patent Application are incorporated herein by reference. Background technique [0002] In recent years, from the viewpoint of protecting the global environment, there has been an increasing need for dry machining that does not use cutting oil, and the cutting speed has been further increased to improve machining efficiency, and the materials to be cut are diversified, and in the aircraft and medical fields, it is called difficult-to-cut The cutting of heat-resistant alloys of materials is increasing day by day. For these and other reasons, the cutting edge of a surface-coated cutting tool tends to be heated to high temperatures during cutting operations. The life of a surface-coated cutting too...

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Problems solved by technology

Surface-coated cutting tools whose cutting edges are heated to high temperatures will have a shorter lifespan

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