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Patent Searching and Data


Title:
BEARING RING MANUFACTURING METHOD
Document Type and Number:
WIPO Patent Application WO/2017/154986
Kind Code:
A1
Abstract:
Provided is a bearing ring manufacturing method in which increased surface roughness of the steel material is limited. The method is provided with: a step (S0) for preparing steel material and a processing unit for obtaining a bearing ring from the steel material; a step (S2) for setting the steel material in the processing unit; and steps (S3-S13) for obtaining the bearing ring by heating the steel material in the processing unit to a temperature of at least the A1 transformation temperature, then punching a portion of the steel material in a ring shape, and then quenching the ring-shaped steel material in the processing unit. In the steps for obtaining the bearing ring, heating and punching are performed in a state in which oxidation of the steel material is inhibited and a state in which tension is applied between a first portion and a second portion of the steel material that are separated from each other in at least one direction of the principal plane of the steel material with the processing unit therebetween.

Inventors:
MIZUTA, Kohei (105 Hidamarinooka 5-chome, Kuwana-sh, Mie 67, 〒5110867, JP)
OHKI, Chikara (105 Hidamarinooka 5-chome, Kuwana-sh, Mie 67, 〒5110867, JP)
Application Number:
JP2017/009282
Publication Date:
September 14, 2017
Filing Date:
March 08, 2017
Export Citation:
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Assignee:
NTN CORPORATION (3-17, Kyomachibori 1-chome Nishi-ku, Osaka-sh, Osaka 03, 〒5500003, JP)
International Classes:
F16C33/64; B21D22/20; B21D24/16; B21D28/00; B21D28/02; B21D53/10; C21D1/18; C21D1/76; C21D9/40; F16C19/36; F16C19/44
Domestic Patent References:
WO2016006550A12016-01-14
Foreign References:
JP2005169475A2005-06-30
Attorney, Agent or Firm:
FUKAMI PATENT OFFICE, P.C. (Nakanoshima Central Tower, 2-7 Nakanoshima 2-chome, Kita-ku, Osaka-sh, Osaka 05, 〒5300005, JP)
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