Continuous-generation gear-wheel grinding method

Patent metadata

Field	Value
Publication number	US-2016107291-A1
Application number	US-201414893723-A
Country	US
Kind code	A1
Filing date	May 28, 2014
Priority date	May 31, 2013
Publication date	Apr 21, 2016
Grant date	—

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

1 . 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.

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 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 grinding wheel cross section, the vitrified grinding wheel has homogeneity represented by a variation coefficient of 17 or less acquired by dividing the standard deviation of the abrasive grain area ratio by the average value of the abrasive grain area ratio.

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

5 . 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.

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

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

Assignees

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

Inventors

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

Classifications

• B24D3/14

  ceramic, i.e. vitrified bondings · CPC title

• B24B53/075 Primary

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

• B23F5/04

  the tool being a grinding worm · CPC title

• B23F21/02

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

• 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