Title:
MOBILE HARDENING METHOD AND MOBILE HARDENING DEVICE
Document Type and Number:
WIPO Patent Application WO/2024/057406
Kind Code:
A1
Abstract:
Provided is a mobile hardening method characterized in that a shaft body (10) is heated by a plurality of high-frequency coils (111), a cooling unit (120) is caused to follow the high-frequency coils (111) from behind in the relative moving direction of the high-frequency coils (111) along the axial direction of the shaft body (10), the part heated by the high-frequency coils (111) is cooled by the cooling unit (120), and mobile hardening is carried out while moving the high-frequency coils (111) toward the direction perpendicular to the axial direction of the shaft body (10) so that the distances from the surface of the shaft body (10) to the respective high-frequency coils (111) are constant, wherein the speed in the axial direction of the high-frequency coils (111) at the time when the high-frequency coils (111) pass through a step part (13) is slower than the speed in the axial direction of the high-frequency coils (111) at the time when the high-frequency coils (111) pass through a small diameter part (12) or a large diameter part (11).
Inventors:
YAMANE AKIHITO (JP)
HATA TOSHIYUKI (JP)
KOZUKA CHIHIRO (JP)
HATA TOSHIYUKI (JP)
KOZUKA CHIHIRO (JP)
Application Number:
PCT/JP2022/034240
Publication Date:
March 21, 2024
Filing Date:
September 13, 2022
Export Citation:
Assignee:
NIPPON STEEL CORP (JP)
International Classes:
C21D9/28; C21D1/10
Domestic Patent References:
| WO2019181382A1 | 2019-09-26 |
Foreign References:
| JP2016089262A | 2016-05-23 | |||
| JP2009019230A | 2009-01-29 | |||
| JP2015108188A | 2015-06-11 | |||
| JP2005344159A | 2005-12-15 | |||
| CN1600873A | 2005-03-30 |
Attorney, Agent or Firm:
MATSUNUMA Yasushi et al. (JP)
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