# US 10,307,888 B2 · Superabrasive wheel

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- Number: US 10,307,888 B2
- Document ID: US10307888B2
- Status: Granted
- Kind: B2
- Application number: 15/549,612
- Filed: 2016-09-08
- Published: 2018-02-15
- Granted: 2019-06-04
- Earliest claimed: 2015-12-10
- Assignees: A.L.M.T. Corp.
- Applicants: A.L.M.T. Corp.
- Inventors: Masanori Hoshika; Hikaru Yamazaki; Hirohisa Koterasawa; Kenji Fukushima
- Web page: https://patentgrep.com/patent/US10307888B2

## CPC

- B24D 5/02: Wheels in one piece
- B24D 3/00: Physical features of abrasive bodies, or sheets, e.g. abrasive surfaces of special nature; Abrasive bodies or sheets characterised by their constituents
- B24D 3/06: metallic {or mixture of metals with ceramic materials, e.g. hard metals, "cermets", cements}
- 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)

## Abstract

A superabrasive wheel having a superabrasive grain layer having superabrasive grains fixed by a binder, a ratio of an area occupied by the superabrasive grains in the superabrasive grain layer being 20% to 70%.

## Claims

### Claim 1

A superabrasive wheel having a superabrasive grain layer having CBN abrasive grains fixed by a binder, a ratio of an area occupied by the CBN abrasive grains in the superabrasive grain layer being 20% to 70%, an area ratio at which the CBN abrasive grains' tips work on a workpiece being 1% to 30% per unit area of a surface of the superabrasive grain layer, the superabrasive grain layer having the CBN abrasive grains fixed in a single layer, the binder being metal plating or a brazing material.

### Claim 2 (depends on 1)

The superabrasive wheel according to claim 1, wherein the CBN abrasive grain has an average grain size of 5 μm to 2000 μm.

### Claim 3 (depends on 1)

The superabrasive wheel according to claim 1, wherein a projection and a depression having a height of 1 μm or more are formed at a tip of the CBN abrasive grain.

### Claim 4 (depends on 1)

The superabrasive wheel according to claim 1, wherein the binder has a thickness of 30% to 90% of an average grain size of the CBN abrasive grain.

### Claim 5 (depends on 1)

The superabrasive wheel according to claim 1, wherein a plurality of the CBN abrasive grains work on a workpiece, and the plurality of the CBN abrasive grains working on the workpiece have tips, respectively, having a variation in height of 5 μm or less.

### Claim 6 (depends on 1)

The superabrasive wheel according to claim 1, used for precision grinding in which a surface roughness of a workpiece is 5 μm Rz or less.

### Claim 7 (depends on 1)

The superabrasive wheel according to claim 1, wherein the ratio of the area occupied by the CBN abrasive grains in the superabrasive grain layer is 30% to 70%.

### Claim 8 (depends on 1)

The superabrasive wheel according to claim 1, wherein the binder has a thickness of 30% to 80% of an average grain size of the CBN abrasive grain.