# US 12,214,426 B1 · Cutting tool

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- Number: US 12,214,426 B1
- Document ID: US12214426B1
- Status: Granted
- Kind: B1
- Application number: 18/723,483
- Filed: 2023-11-29
- Granted: 2025-02-04
- Earliest claimed: 2023-11-29
- Assignees: Sumitomo Electric Industries, Ltd.
- Applicants: Sumitomo Electric Industries, Ltd.
- Inventors: Haruyo Fukui; Nozomi Tsukihara; Toshihiro Tabata
- Web page: https://patentgrep.com/patent/US12214426B1

## CPC

- B23B 27/148: {Composition of the cutting inserts}
- C23C 14/024: {Deposition of sublayers, e.g. to promote adhesion of the coating (C23C14/027 takes precedence)}
- C23C 14/0641: {Nitrides (C23C14/0617 takes precedence)}
- C23C 14/0676: {Oxynitrides}
- C23C 14/325: {Electric arc evaporation}
- C23C 28/044: {coatings specially adapted for cutting tools or wear applications}
- C23C 28/42: {characterized by the composition of the alternating layers}
- C23C 30/005: {on hard metal substrates}
- B23B 2228/105: with specified thickness
- B23B: TURNING; BORING (arrangements for copying or controlling B23Q)
- C23C: COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL (making metal-coated products by extrusion B21C23/22; covering with metal by connecting pre-existing layers to articles, see the relevant places, e.g. B21D39/00, B23K; metallising of glass C03C; metallising mortars, concrete, artificial stone, ceramics or natural stone C04B41/00; enamelling of, or applying a vitreous layer to, metals C23D; treating metal surfaces or coating of metals by electrolysis or electrophoresis C25D; single-crystal film growth C30B; by metallising textiles D06M11/83; decorating textiles by locally metallising D06Q1/04)

## Abstract

A cutting tool, including: a base; and a coating disposed on the base, wherein the coating includes a first layer, the first layer is composed of an alternate layer in which a first unit layer and a second unit layer are alternately stacked, the first unit layer is composed of Ti1-aMoaN, a represents 0.01 or more and 0.20 or less, the second unit layer is composed of AlbCr1-bN, and b represents 0.40 or more and 0.80 or less.

## Claims

### Claim 1

A cutting tool, comprising:
a base; and
a coating disposed on the base, wherein
the coating includes a first layer,
the first layer is composed of an alternate layer in which a first unit layer and a second unit layer are alternately stacked,
the first unit layer is composed of Ti1-aMoaN,
a represents 0.01 or more and 0.20 or less,
the second unit layer is composed of AlbCr1-bN, and
b represents 0.40 or more and 0.80 or less.

### Claim 2 (depends on 1)

The cutting tool according to claim 1, wherein in the first unit layer and the second unit layer adjacent to the first unit layer, a ratio λ2/λ1 of a thickness λ2 μm of the second unit layer to a thickness λ1 μm of the first unit layer is 1.0 or more and 5.0 or less.

### Claim 3 (depends on 1)

The cutting tool according to claim 1, wherein
an average thickness of the first unit layer is 0.002 μm or more and 0.2 μm or less, and
an average thickness of the second unit layer is 0.002 μm or more and 0.2 μm or less.

### Claim 4 (depends on 1)

The cutting tool according to claim 1, wherein
the coating further includes a surface layer provided on a side opposite to the base of the first layer, and
the surface layer is composed of TiMoON or AlCrON.

### Claim 5

A cutting tool, comprising:
a base; and
a coating disposed on the base, wherein
the coating includes a second layer,
the second layer is composed of an alternate layer in which a first unit layer and a third unit layer are alternately stacked,
the first unit layer is composed of Ti1-aMoaN,
a represents 0.01 or more and 0.20 or less,
the third unit layer is composed of AlcCr1-c-dXdN,
X represents one or two selected from the group consisting of boron, silicon, scandium, yttrium, and cerium,
c represents 0.40 or more and 0.80 or less, and
d represents 0.001 or more and 0.05 or less.

### Claim 6 (depends on 5)

The cutting tool according to claim 5, wherein in the first unit layer and the third unit layer adjacent to the first unit layer, a ratio λ3/λ1 of a thickness λ3 μm of the third unit layer to a thickness λ1 μm of the first unit layer is 1.0 or more and 5.0 or less.

### Claim 7 (depends on 5)

The cutting tool according to claim 5, wherein
an average thickness of the first unit layer is 0.002 μm or more and 0.2 μm or less, and
an average thickness of the third unit layer is 0.002 μm or more and 0.2 μm or less.

### Claim 8 (depends on 5)

The cutting tool according to claim 5, wherein
the coating further includes a surface layer provided on a side opposite to the base of the second layer,
the surface layer is composed of TiMoON or AlCrXON, and
X represents one or two selected from the group consisting of boron, silicon, scandium, yttrium, and cerium.