# US 9,751,191 B2 · Grinding tool including a matrix and at least one wear-promoting particle embedded in the matrix

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- Number: US 9,751,191 B2
- Document ID: US9751191B2
- Status: Granted
- Kind: B2
- Application number: 15/405,533
- Filed: 2017-01-13
- Published: 2017-05-04
- Granted: 2017-09-05
- Earliest claimed: 2011-12-01
- Assignees: Tyrolit Schleifmittelwerke Swarovski K.G.
- Applicants: Tyrolit—Schleifmittelwerke Swarovski K.G.
- Inventors: Franz Egger
- Web page: https://patentgrep.com/patent/US9751191B2

## CPC

- B24D 3/342: {incorporated in the bonding agent}
- B24D 3/06: metallic {or mixture of metals with ceramic materials, e.g. hard metals, "cermets", cements}
- B24D 3/346: {utilised during polishing, or grinding operation}
- B24D 5/06: with inserted abrasive blocks, e.g. segmental
- B24D 5/12: Cut-off wheels
- B24D 5/123: {having different cutting segments}
- B24D 18/0009: {using moulds or presses}
- B24D 18/0054: {by impressing abrasive powder in a matrix}
- B28D 1/121: {Circular saw blades}
- B24D: TOOLS FOR GRINDING, BUFFING OR SHARPENING (abrading-bodies specially designed for tumbling apparatus, e.g. abrading-balls B24B31/14; honing tools B24B33/08; lapping tools B24B37/11)
- B28D: WORKING STONE OR STONE-LIKE MATERIALS

## Abstract

A grinding tool, such as a cutting disc, includes a matrix, in particular a sintered metal matrix, and diamonds embedded in the matrix. At least the majority of the diamonds are each assigned at least one wear-promoting particle. The at least one wear-promoting particle is likewise embedded in the matrix.

## Claims

### Claim 1

A grinding tool, comprising a matrix, and diamonds embedded in the matrix, wherein:
each of at least a majority of the diamonds has at least one wear-promoting particle associated therewith,
the at least one wear-promoting particle is embedded in the matrix,
the grinding tool has a grinding direction,
the at least one wear-promoting particle is embedded in the matrix upstream of the diamond with which the at least one wear-promoting particle is associated in the grinding direction, and
the grinding tool has a grinding contact surface which is towards an article to be ground in a condition of use, and
the at least one wear-promoting particle is at a smaller spacing relative to the grinding contact surface in relation to the diamond with which the at least one wear-promoting particle is associated.

### Claim 2 (depends on 1)

The grinding tool as set forth in claim 1, wherein the at least one wear-promoting particle comprises pre-sintered granular material.

### Claim 3 (depends on 2)

The grinding tool as set forth in claim 2, wherein the pre-sintered granular material comprises a binding phase and incorporated molybdenum disulfide and/or graphite powder.

### Claim 4 (depends on 3)

The grinding tool as set forth in claim 3, wherein the binding phase comprises copper, cobalt, iron, bronze or nickel.

### Claim 5 (depends on 1)

The grinding tool as set forth in claim 1, wherein the at least one wear-promoting particle is of a grain size of between 250 μm and 600 μm.

### Claim 6 (depends on 1)

The grinding tool as set forth in claim 1, further comprising at least one grinding segment, wherein the at least one grinding segment is arranged on at least one carrier body.

### Claim 7 (depends on 6)

The grinding tool as set forth in claim 6, wherein the at least one carrier body comprises steel.

### Claim 8 (depends on 1)

The grinding tool as set forth in claim 1, wherein the grinding tool is a cutting disc.

### Claim 9 (depends on 1)

The grinding tool as set forth in claim 1, wherein the matrix is a sintered metal matrix.

### Claim 10

A grinding tool, comprising a matrix, and diamonds embedded in the matrix, wherein:
each of at least a majority of the diamonds has at least one wear-inhibiting particle associated therewith,
the at least one wear-inhibiting particle is embedded in the matrix,
the grinding tool has a grinding direction,
the at least one wear-inhibiting particle is embedded in the matrix downstream of the diamond with which the at least one wear-inhibiting particle is associated in the grinding direction, and
the grinding tool has a grinding contact surface which is towards an article to be ground in a condition of use, and
the at least one wear-inhibiting particle is at a greater spacing relative to the grinding contact surface in relation to the diamond with which the at least one wear-inhibiting particle is associated.

### Claim 11 (depends on 10)

The grinding tool as set forth in claim 10, wherein the at least one wear-inhibiting particle comprises hard metal grit, corundum, silicon carbide and/or boronitride.

### Claim 12 (depends on 10)

The grinding tool as set forth in claim 10, wherein the at least one wear-inhibiting particle is of a grain size of between 250 μm and 600 μm.

### Claim 13 (depends on 10)

The grinding tool as set forth in claim 10, further comprising at least one grinding segment, wherein the at least one grinding segment is arranged on at least one carrier body.

### Claim 14 (depends on 13)

The grinding tool as set forth in claim 13, wherein the at least one carrier body comprises steel.

### Claim 15 (depends on 10)

The grinding tool as set forth in claim 10, wherein the grinding tool is a cutting disc.

### Claim 16 (depends on 10)

The grinding tool as set forth in claim 10, wherein the matrix is a sintered metal matrix.