Title:
METHOD FOR PRODUCING PREFORM FOR ROLLING BEARING
Document Type and Number:
WIPO Patent Application WO/2015/068601
Kind Code:
A1
Abstract:
In the present invention, a preform for a rolling bearing is produced by forging a steel material, which is formed of a high-carbon chromium bearing steel that contains 0.7-1.2 mass % of carbon and 0.8-1.8 mass % of chromium, into a prescribed shape while heating the steel material at a forging temperature that falls within the range of (Ae1 point +25ºC) to (Ae1 point +105ºC), cooling the steel material to a temperature that is not higher than the Ae1 point, heating the obtained forged steel material at a soaking temperature that falls within the range of (Ae1 point +25ºC) to (Ae1 point +85ºC), holding the forged steel material at this temperature for a period of 0.5 hours or longer, and then annealing by cooling the forged steel material to a temperature of 700°C or lower at a cooling rate of 0.30ºC/s or less.
Inventors:
YANO TAKEFUMI (JP)
KASHIWAGI SHINICHIROU (JP)
UEKITA HIROKI (JP)
SAITOU TOSHIKAZU (JP)
HIRANO TETSUROU (JP)
NEISHI YUTAKA (JP)
KASHIWAGI SHINICHIROU (JP)
UEKITA HIROKI (JP)
SAITOU TOSHIKAZU (JP)
HIRANO TETSUROU (JP)
NEISHI YUTAKA (JP)
Application Number:
PCT/JP2014/078471
Publication Date:
May 14, 2015
Filing Date:
October 27, 2014
Export Citation:
Assignee:
NIPPON STEEL & SUMITOMO METAL CORP (JP)
International Classes:
C21D8/00; B21K1/04; C22C38/00; C22C38/18; F16C19/36; F16C33/62; F16C33/64; C22C38/40
Domestic Patent References:
| WO1999034023A1 | 1999-07-08 |
Foreign References:
| JP2009024218A | 2009-02-05 | |||
| JP2002012919A | 2002-01-15 | |||
| JP2007231332A | 2007-09-13 | |||
| JP2008194742A | 2008-08-28 | |||
| CN103122433A | 2013-05-29 | |||
| JP2009024218A | 2009-02-05 |
Other References:
See also references of EP 3067433A4
MASUDA ET AL.: "Revised industrial plastic mechanics", 20 February 1995, YOKENDO CO. LTD., pages: 113
MASUDA ET AL.: "Revised industrial plastic mechanics", 20 February 1995, YOKENDO CO. LTD., pages: 113
Attorney, Agent or Firm:
SHIGA Masatake et al. (JP)
Masatake Shiga (JP)
Masatake Shiga (JP)
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