# US 10,307,843 B2 · Internal gear grinding method

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- Number: US 10,307,843 B2
- Document ID: US10307843B2
- Status: Granted
- Kind: B2
- Application number: 14/890,776
- Filed: 2014-05-26
- Published: 2016-05-05
- Granted: 2019-06-04
- Earliest claimed: 2013-05-29
- Assignees: Mitsubishi Heavy Industries Machine Tool Co., Ltd.
- Applicants: Mitsubishi Heavy Industries Machine Tool Co., Ltd.
- Inventors: Masashi Ochi; Yoshikoto Yanase; Yasuhiro Nakamichi
- Web page: https://patentgrep.com/patent/US10307843B2

## CPC

- B23F 5/04: the tool being a grinding worm
- B23F 5/02: by grinding
- B23F 23/1225: {Arrangements of abrasive wheel dressing devices on gear-cutting machines (dressing devices per se B24B53/00)}
- B24B 53/075: for workpieces having a grooved profile, e.g. gears, splined shafts, threads, worms (B24B53/07 takes precedence)
- B23F: MAKING GEARS OR TOOTHED RACKS (by stamping B21D; by rolling B21H; by forging or pressing B21K; by casting B22; arrangements for copying or controlling B23Q; machines or devices for grinding or polishing, in general B24B)
- B24B: MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING (grinding of gear teeth B23F, of screw-threads B23G1/36; by electro-erosion B23H; abrasive or related blasting B24C; tools for grinding, buffing or sharpening B24D; polishing compositions C09G1/00; abrasives C09K3/14; electrolytic etching or polishing C25F3/00; grinding arrangements for use on assembled railway tracks E01B31/17); DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS

## Abstract

Provided is an internal gear grinding method that makes it possible to grind an internal gear having arc-shaped teeth in a short amount of time. To this end, an internal gear having arc-shaped teeth and a threaded grindstone with a barrel shape having blades with a shape corresponding to the arc shape of the teeth are engaged at a predetermined axis intersection angle, and the internal gear and the threaded grindstone are made to rotate in synchronization with each other so that the tooth surface of the internal gear is ground by the blade surface of the threaded grindstone.

## Claims

### Claim 1

An internal gear grinding method comprising the step of:
grinding an internal gear having arc-shaped teeth using a threaded grindstone with a barrel shape having blades with a shape corresponding to the arc shape of the teeth, by causing the internal gear to engage with the threaded grindstone at a prescribed first axis intersection angle and rotating the internal gear and threaded grindstone in synchronization with each other, wherein
a dressing gear with an internal gear shape that dresses the threaded grindstone by engaging with the threaded grindstone at a prescribed second axis intersection angle and rotating in synchronization about a dressing gear rotational axis located on the same axis as a work rotational axis of the internal gear is provided, and
wherein the first axis intersection angle during the grinding of the internal gear is smaller than the second axis intersection angle at which the threaded grindstone is dressed after grinding of the internal gear.