Title:
QUENCHING DEVICE AND METHOD FOR QUENCHING RACK BAR
Document Type and Number:
WIPO Patent Application WO/2020/066805
Kind Code:
A1
Abstract:
A quenching device for a rack bar having a rack formed within a partial section of an entire length of a hollow shaft member includes a plurality of binding jigs which binds the rack bar along the partial section and from a radial direction of the rack bar. Each of the binding jigs includes a spraying portion, and the spraying portion of each of the plurality of binding jigs sprays a coolant uniformly to a plurality of annular regions on an outer peripheral surface of the rack bar within the partial section, each of the annular regions extending around the outer peripheral surface and including a corresponding tooth bottom of the rack. By spraying the coolant uniformly thereto, irregularity of a tooth pitch of the rack due to quenching distortion is suppressed, so that an accuracy of the rack bar is improved.
Inventors:
YAMAWAKI TAKASHI (JP)
KISHIMOTO KIYOSHI (JP)
KISHIMOTO KIYOSHI (JP)
Application Number:
PCT/JP2019/036635
Publication Date:
April 02, 2020
Filing Date:
September 18, 2019
Export Citation:
Assignee:
NETUREN CO LTD (JP)
International Classes:
C21D1/00; C21D1/18; C21D1/60; C21D1/62; C21D1/667; C21D9/00; F27D9/00
Foreign References:
| JP2000119739A | 2000-04-25 | |||
| JP2001234245A | 2001-08-28 | |||
| JP2004315851A | 2004-11-11 | |||
| JP2004131823A | 2004-04-30 | |||
| JP2001011536A | 2001-01-16 | |||
| JP2017137536A | 2017-08-10 | |||
| JPS62180018A | 1987-08-07 | |||
| JP2000119739A | 2000-04-25 | |||
| JP2001011536A | 2001-01-16 | |||
| JP2018179177A | 2018-11-15 |
Attorney, Agent or Firm:
KOH-EI PATENT FIRM, P.C. (JP)
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