Nsk Corporation

Akitoshi Maeda

Kiyoshi Hirakawa

Manabu Ohhori

Hiroaki Sugiyama

Dai Kinno

Tsuyoshi Saito

Tomohiro Motoda

Sadayuki Tanaka

Takamasa Ohira

Hiroyuki Uchida

Masateru Kondo

Tooru Shouda

Naohiro Yoshida

Shingo Higashi

Seisuke Takeda

Kazunobu Taketa

Haruo Kamijo

A rolling device in which rust development or damage on a raceway surface or rolling surface is hard to occur even if water and the like intrude is provided. A self-aligning roller bearing comprises an inner ring, an outer ring, and a plurality of rolling elementsdisposed rotatably between a raceway surfaceof the inner ringand a raceway surfaceof the outer ring. At least any one of the inner ring, the outer ring, and the rolling elementsis provided with a metal coating formed by shot peening of a powder of metal less noble than iron at least on a part of its surface.

Rolling device

In a corrective tempering method and apparatus for a rolling element in which the thermal deformation of the rolling element is corrected within an extremely short time by utilizing plasticity exhibited during a metallic structure transforming process brought about by low-temperature tempering of the rolling element made of steel, the hardened rolling element is heated and pressured to a maximum temperature within a range of from 250 to 500&deg; C. by a heating device while set in correcting molds to correct the deformation of the rolling element at a degree of working within a range not exceeding an elastic deformation range of the rolling element at a room temperature. The rolling element can be heated also by an induction heating device in addition to a conduction heating device. A product whose inner/outer diameter correcting degree of deformation is 60% or more, dimension standardizing rate is 30% or more, surface roughness is less than Ra 0.2 &mgr;m, and surface hardness is HRC,or more can be obtained for a correction time within 6 minutes and an induction heating time within 30 seconds.

Corrective tempering apparatus for rolling elements

Corrective tempering method for rolling elements

Growing community of inventors

Fujisawa, Japan

Akitoshi Maeda