Toyota Motor Hokkaido, Inc.

Mitsubishi Materials Corporation

Noritake Co., Ltd.

Yushiro Chemical Industry Co., Ltd.

Toru Yamazaki

Kensuke Kohno

Kazuhiro Horimi

Tatsuyoshi Yasuda

You Tanaka

Yoshihisa Hayakawa

Masatoshi Ozaki

Sho Nakajima

This broach includes a broach body having a shaft shape and a cutting edge section in which cutting edges protrude and are arranged in a longitudinal direction on an outer circumference of the broach body. The cutting edge section includes, in the order from a front side of the broach body, an circumference cutting section in which an outer diameter of each of the cutting edges sequentially increases rearward, and a tooth thickness cutting section in which a thickness of each of the cutting edges sequentially increases from the cutting edges at a rear end of the circumference cutting section toward the rear side. At least a rear end portion of the circumference cutting section is a high-feed cutting section in which the cutting depth per cutting edge is set in a range of 0.15 mm or more and 0.30 mm or less.

Broach

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.

Continuous-generation gear-wheel grinding method

Growing community of inventors

Hokkaido, Japan

Toru Yamazaki