# US 5,343,656 A · Grinding tool and the like made of a ceramic material coated with extremely hard abrasive granules

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- Number: US 5,343,656 A
- Document ID: US5343656A
- Status: Granted
- Kind: A
- Application number: 08/025,358
- Filed: 1993-03-01
- Granted: 1994-09-06
- Earliest claimed: 1989-08-01
- Assignees: Hurth Maschinen und Werkzeuge G.m.b.H.
- Inventors: Herbert Loos; Manfred Erhardt; Gerhard Reichert
- Web page: https://patentgrep.com/patent/US5343656A

## CPC

- B24D 3/28: Resins {or natural or synthetic macromolecular compounds (B24D3/22 takes precedence)}
- B24D 18/0054: {by impressing abrasive powder in a matrix}
- 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

To manufacture grinding members covered with extremely hard abrasive granules, instead of a base member of steel, a commercially available grinding tool of a corresponding shape and size made of a porous ceramic material is used as the base member. The base member is coated with an adhesive at the areas to be covered, the abrasive granules are applied and are pressed into the pores of the ceramic material; finally the adhesive is allowed to harden.

## Claims

### Claim 1

In a tool suited for a precision working of hardened workpieces comprising a base member covered with extremely hard grinding granules, the improvement wherein the base member consists of a porous ceramic material having a plurality of outwardly open pores of a predetermined average pore diameter (d.sub.p) provided in an area of a work surface, wherein extremely hard grinding granules having an average granule diameter (d.sub.K) are provided and are received in the outwardly open pores, wherein an adhesive is provided for adhesively securing the extremely hard grinding granules in the outwardly open pores, the average granule diameter (d.sub.K) of the extremely hard grinding granules being only a little less than the average pore diameter (d.sub.p) so that the plurality of outwardly open pores, aside from the adhesive, each receives only one extremely hard grinding granule therein, and wherein the extremely hard grinding granules received in the outwardly open pores project a specific measurement (h) from the work surface of the base member, which assures that only the extremely hard grinding granules participate in the precision working.

### Claim 2 (depends on 1)

The tool suited for a precision working of hardened workpieces according to claim 1, wherein the tool is a gear-shaped tool having a plurality of tooth flanks thereon for precision working of tooth flanks of gears, and wherein the extremely hard grinding granules are adhesively secured by the adhesive into the outwardly open pores in an area of the tooth flanks of the gear-shaped tool.