Surface-coated cutting tool

Patent metadata

Field	Value
Publication number	US-11007578-B2
Application number	US-201716331040-A
Country	US
Kind code	B2
Filing date	Sep 11, 2017
Priority date	Sep 16, 2016
Publication date	May 18, 2021
Grant date	May 18, 2021

Abstract

A surface-coated cutting tool comprises a hard coating layer that includes a TiAlN layer and is provided on a surface of a cutting tool body. In case the composition of the TiAlN layer is expressed by a formula: (TixAl1-x)N, 0.10≤x≤0.35 (here, x is in atomic ratio) is satisfied. In the TiAlN layer, a high Ti band-like region is present in a direction at 30 degrees or less with respect to a line normal to the surface of the cutting tool body. An average composition X of the Ti component in the high Ti band-like region satisfies (x+0.01)≤X≤(x+0.05), an average width W of the high Ti band-like region is 30 to 500 nm, and an average area ratio St of the high Ti band-like region is 3 to 50 area %.

First claim

The invention claimed is:

1. A surface-coated cutting tool comprising:
a cutting tool body; and
a hard coating layer that is provided on a surface of the cutting tool body made of any of WC cemented carbide, TiCN cermet, or a cubic boron nitride sintered material, wherein
the hard coating layer includes at least a complex nitride layer of Ti and Al with an average layer thickness of 0.5 to 10.0 μm,
in a case where a composition of the complex nitride layer of Ti and Al is expressed by a composition formula: (Ti x Al 1-x )N,
the complex nitride layer of Ti and Al has an average composition satisfying 0.10≤x≤0.35 (here, x is in atomic ratio),
in the complex nitride layer of Ti and Al, a band-like region, in which a composition of a Ti component is relatively high compared to an average composition x of the Ti component, is present at least in a direction at an angle of 30 degrees or less with respect to a line normal to the surface of the cutting tool body,
an average width W of the band-like region, in which the composition of the Ti component is relatively high, is 30 to 500 nm, and
an average area ratio of the band-like region, in which the composition of the Ti component is relatively high, to a longitudinal section of the complex nitride layer of Ti and Al is 3 to 50 area %.

2. The surface-coated cutting tool according to claim 1 , wherein, in a case where the average composition of the Ti component in the band-like region in which the composition of the Ti component is relatively high is referred to as X, the average composition x of the Ti component in the complex nitride layer of Ti and Al and the X satisfy a relationship of (x+0.01)≤X≤(x+0.05).

3. The surface-coated cutting tool according to claim 1 , wherein the complex nitride layer of Ti and Al has a mixed structure of crystal grains having a cubic structure and crystal grains having a hexagonal structure, and an average area ratio of the crystal grains having a cubic structure to a longitudinal section of the complex nitride layer of Ti and Al is 30 area % or more.

4. The surface-coated cutting tool according to claim 2 , wherein the complex nitride layer of Ti and Al has a mixed structure of crystal grains having a cubic structure and crystal grains having a hexagonal structure, and an average area ratio of the crystal grains having a cubic structure to a longitudinal section of the complex nitride layer of Ti and Al is 30 area % or more.

Assignees

• Mitsubishi Materials Corp

Inventors

• Sato Shun
• Ogami Tsuyoshi
• Yamaguchi Kenji

Classifications

• B23F21/16

  Hobs · CPC title

• B23F21/10

  Gear-shaper cutters having a shape similar to a spur wheel or part thereof · CPC title

• B23C5/16

  characterised by physical features other than shape · CPC title

• B23B51/00

  Tools for drilling machines · CPC title

• C23C14/06

  characterised by the coating material ({C23C14/0021} , C23C14/04 take precedence) · CPC title