Continuous-generation gear-wheel grinding method

Patent metadata

Field	Value
Publication number	US-10449656-B2
Application number	US-201414893723-A
Country	US
Kind code	B2
Filing date	May 28, 2014
Priority date	May 31, 2013
Publication date	Oct 22, 2019
Grant date	Oct 22, 2019

Abstract

A continuous-generation gear grinding method of conducting a gear grinding process such that while a thread-shaped grinding wheel is rotated around an axial center thereof and fed in an axial center direction, a position coming into contact with abrasive grains is constantly changed in the presence of a water-soluble grinding fluid by performing a grinding feed in a direction parallel to an axial center of a gear blank and by serially rotating the gear blank around the axial center, the grinding wheel being a vitrified grinding wheel having abrasive grains bonded by a vitrified bond with pores formed among the abrasive grains, and the abrasive grains having a grain size of F120 to F180.

First claim

The invention claimed is:

1. A continuous-generation gear grinding method of conducting a gear grinding process on an outer circumferential surface of a gear blank such that while a thread-shaped grinding wheel is rotated around an axial center thereof and fed in an axial center direction, a position of the gear blank coming into contact with abrasive grains is constantly changed in the presence of a water-soluble grinding fluid by performing a grinding feed in a direction parallel to an axial center of the gear blank and by serially rotating the gear blank around the axial center,
the grinding wheel being a vitrified grinding wheel having abrasive grains bonded by a vitrified bond with pores formed among the abrasive grains,
the abrasive grains having a grain size of F120 to F180, and
in a frequency distribution chart of an abrasive grain area ratio that is a proportion of solid bodies including the abrasive grains per unit area of multiple portions in a cross section of the grinding wheel, the vitrified grinding wheel having homogeneity represented by a variation coefficient of 17 or less acquired by dividing a standard deviation of the abrasive grain area ratio by an average value of the abrasive grain area ratio.

2. The continuous-generation gear grinding method according to claim 1 , wherein the vitrified grinding wheel has an abrasive grain volume fraction of 40 to 44 vol. %.

3. The continuous-generation gear grinding method according to claim 1 , wherein the abrasive grains are A-based (alumina-based) polycrystalline abrasive grains.

4. The continuous-generation gear grinding method according to claim 1 , wherein the water-soluble grinding fluid contains at least one selected from a group consisting of polyalkylene glycols and non-ionic surfactants and at least one selected from a group consisting of extreme-pressure agents in a metalworking fluid composition and is diluted with water before use such that a concentration during use is 2.5 mass % or more.

5. The continuous-generation gear grinding method according to claim 4 , wherein the metalworking fluid composition contains 0.5 to 20 mass % non-ionic surfactant and polyalkylene glycols.

6. The continuous-generation gear grinding method according to claim 4 , wherein the metalworking fluid composition contains a 5 to 50 mass % extreme-pressure agent.

Assignees

• Toyota Motor Hokkaido Inc
• Noritake Co Ltd
• Yushiro Chemical Ind Co Ltd

Inventors

• Ozaki Masatoshi
• Yamazaki Toru
• Horimi Kazuhiro
• Yasuda Tatsuyoshi
• Hayakawa Yoshihisa
• Nakajima Sho

Classifications

• B24B55/02

  Equipment for cooling the grinding surfaces, e.g. devices for feeding coolant (cooling or lubricating during dressing operation B24B53/095; incorporated in grinding wheels B24D) · CPC title

• B24B53/075 Primary

  for workpieces having a grooved profile, e.g. gears, splined shafts, threads, worms (B24B53/07 takes precedence) · CPC title

• B23F21/02

  Grinding discs; Grinding worms (truing grinding tools B24B; grinding tools in general B24D) · CPC title

• B24D3/14

  ceramic, i.e. vitrified bondings · CPC title

• B23F5/04

  the tool being a grinding worm · CPC title