Title:
METHOD AND APPARATUS FOR SHAFT DIAMETER ENLARGEMENT
Document Type and Number:
WIPO Patent Application WO/2019/050018
Kind Code:
A1
Abstract:
To radially enlarge an intermediate portion of a shaft, the shaft is held by a pair of holders with a gap between the pair of holders in an axial direction of the shaft, compression force is applied in the axial direction to the intermediate portion arranged between the pair of holders, and alternating load is applied in a direction intersecting the axial direction to the intermediate portion to enlarge the intermediate portion. When enlarging the intermediate portion, a temperature of the intermediate portion is set to be above a blue brittleness temperature range of the shaft, and a temperature of the holders is set to be below a tempering temperature range of the holders.
Inventors:
KUWAHARA YOSHITAKA (JP)
OKAMOTO MITSUHIRO (JP)
IKEDA TAKASHI (JP)
MORI KAZUKI (JP)
OKAMOTO MITSUHIRO (JP)
IKEDA TAKASHI (JP)
MORI KAZUKI (JP)
Application Number:
PCT/JP2018/033303
Publication Date:
March 14, 2019
Filing Date:
September 07, 2018
Export Citation:
Assignee:
NETUREN CO LTD (JP)
International Classes:
B21J5/08; B21J9/08
Foreign References:
| JP2007167882A | 2007-07-05 | |||
| JP2005088066A | 2005-04-07 | |||
| JP2005088066A | 2005-04-07 | |||
| JP2007167882A | 2007-07-05 |
Other References:
"Handbook of Steel Materials", June 1967, MARUZEN INC., pages: 552
Attorney, Agent or Firm:
KOH-EI PATENT FIRM, P.C. (JP)
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