# US 8,465,828 B2 · Surface-coated cutting tool

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- Number: US 8,465,828 B2
- Document ID: US8465828B2
- Status: Granted
- Kind: B2
- Application number: 13/510,188
- Filed: 2011-04-04
- Published: 2012-09-13
- Granted: 2013-06-18
- Earliest claimed: 2010-07-16
- Assignees: Sumitomo Electric Hardmetal Corp.
- Applicants: Hideaki Kanaoka; Minoru Itoh; Yoshio Okada; Chie Suzuki; Anongsack Paseuth
- Inventors: Hideaki Kanaoka; Minoru Itoh; Yoshio Okada; Chie Suzuki; Anongsack Paseuth
- Web page: https://patentgrep.com/patent/US8465828B2

## CPC

- B23B 27/141: {Specially shaped plate-like cutting inserts, i.e. length greater or equal to width, width greater than or equal to thickness (with specially shaped plate-like exchangeable cutting inserts, e.g. chip-breaking groove, B23B27/1603; with removable plate-like milling cutting inserts of special shape B23C5/202)}
- C23C 16/56: After-treatment
- C23C 30/005: {on hard metal substrates}
- B23B 2228/105: with specified thickness
- Y10T 428/24479: including variation in thickness
- Y10T 428/24612: Composite web or sheet
- Y10T 428/24777: Edge feature
- 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)
- Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION

## Abstract

A surface-coated cutting tool having excellent abrasion resistance and defect resistance is provided. The surface-coated cutting tool includes a substrate and a covering layer, wherein the covering layer includes one or two or more sublayers, a thickness T1 of a portion of the covering layer having the smallest thickness in a cutting edge line portion and a thickness T2 of the covering layer at a point 1 mm away from a cutting edge line in a rake face direction in a cross section cut by a particular plane satisfy T1<T2, and a point a on the surface of the covering layer a distance Da away from the cutting edge line in the rake face direction and a point b on the surface of the covering layer a distance Db away from the cutting edge line in a flank face direction satisfy particularly numerical ranges of Da and Db, and in 10% or more of a region E of the covering layer having a thickness in the range of 0.1 T1 to 0.9 T1 from the surface and extending from the point a to the point b, the deviation in the crystal orientation of crystal grains constituting the covering layer is 5 degrees or more and less than 10 degrees.

## Claims

### Claim 1

A surface-coated cutting tool comprising:
a substrate; and
a covering layer formed on the substrate,
wherein the covering layer includes one or two or more sublayers,
a thickness T1 of a portion of the covering layer having the smallest thickness in a cutting edge line portion and a thickness T2 of the covering layer at a point 1 mm away from a cutting edge line in a rake face direction in a cross section of the surface-coated cutting tool cut by a plane containing a line normal to a surface of the covering layer at the center of a rake face and an edge line at which two flank faces intersect satisfy T1 <T2, and
a point a on the surface of the covering layer a distance Da away from the cutting edge line in the rake face direction and a point b on the surface of the covering layer a distance Db away from the cutting edge line in a flank face direction satisfy 0.05 mm ≦Da ≦0.5 mm and 0.01mm ≦Db ≦0.2 mm, and in 10% or more of a region E of the covering layer having a thickness in the range of 0.1T1 to 0.9T1 from the surface and extending from the point a to the point b, the deviation in the crystal orientation of crystal grains constituting the covering layer is 5 degrees or more and less than 10 degrees.

### Claim 2 (depends on 1)

The surface-coated cutting tool according to claim 1, wherein the Dasatisfies 0.05 mm ≦Da ≦0.25 mm.

### Claim 3 (depends on 1)

The surface-coated cutting tool according to claim 1, wherein the region E has a thickness in the range of 0.5T1 to 0.9T1.

### Claim 4 (depends on 1)

The surface-coated cutting tool according to claim 1, wherein the covering layer includes a plurality of sublayers, and the structure of the covering layer in the cutting edge line portion is different from the structure of the covering layer in the region other than the cutting edge line portion.

### Claim 5 (depends on 1)

The surface-coated cutting tool according to claim 1, wherein the T2 is 3 μm or more and 30 μm or less.

### Claim 6 (depends on 1)

The surface-coated cutting tool according to claim 1, wherein a relationship defined as 0.05 ≦T1/T2 ≦0.95 is satisfied.

### Claim 7 (depends on 1)

The surface-coated cutting tool according to claim 1, wherein a relationship defined as 0.3 ≦T1/T2 ≦0.7 is satisfied.

### Claim 8 (depends on 1)

The surface-coated cutting tool according to claim 1, wherein, in order to achieve the deviation in the crystal orientation of crystal grains constituting the covering layer of 5 degrees or more and less than 10 degrees, the 10% or more of the region E is formed by masking a first portion of the rake face beyond a first distance from the cutting edge line and masking a second portion of the flank face beyond a second distance from the cutting edge line, and performing a honing treatment on a first unmasked portion of the rake face within the first distance from the cutting edge line and on a second unmasked portion of the flank face within the second distance from the cutting edge line.

### Claim 9 (depends on 8)

The surface-coated cutting tool according to claim 8, wherein a strain is only produced in the first unmasked portion and the second unmasked portion of the surface-coated cutting tool during the honing treatment, and a strain is not produced in the first masked portion and the second masked portion of the surface-coated cutting tool during the honing treatment.

### Claim 10 (depends on 8)

The surface-coated cutting tool according to claim 8, wherein the first portion and the second portion are masked using a metallic plate.

### Claim 11 (depends on 10)

The surface-coated cutting tool according to claim 10, wherein the metallic plate has a thickness in a range of 0.2 to 3.2 mm.

### Claim 12 (depends on 8)

The surface-coated cutting tool according to claim 8, wherein the first distance is 0.5 mm, and wherein the second distance is 0.2 mm.

### Claim 13 (depends on 8)

The surface-coated cutting tool according to claim 8, wherein the honing treatment includes shot peening.

### Claim 14 (depends on 8)

The surface-coated cutting tool according to claim 8, wherein the honing treatment includes grinding.

### Claim 15 (depends on 14)

The surface-coated cutting tool according to claim 14, wherein the grinding includes grinding using two or more media.

### Claim 16 (depends on 15)

The surface-coated cutting tool according to claim 15, wherein the grinding includes grinding using a first material having high grinding ability and high hardness, and a second material having low grinding ability.

### Claim 17 (depends on 16)

The surface-coated cutting tool according to claim 16, wherein the first material includes SiC, TiC, or diamond, and wherein the second material includes Al2O3 or ZrO2.

### Claim 18 (depends on 11)

The surface-coated cutting tool according to claim 11, wherein the honing treatment includes grinding using two or more media.

### Claim 19 (depends on 18)

The surface-coated cutting tool according to claim 18, wherein the grinding includes grinding using a first material having high grinding ability and high hardness, and a second material having low grinding ability.

### Claim 20 (depends on 19)

The surface-coated cutting tool according to claim 19, wherein the first material includes SiC, TiC, or diamond, and wherein the second material includes Al2O3 or ZrO2.