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Title:
COIL SPRING MANUFACTURING METHOD
Document Type and Number:
WIPO Patent Application WO/2024/075314
Kind Code:
A1
Abstract:
The objective of the present invention is to provide a coil spring manufacturing method with which it is possible to suppress variations in quality. A coil spring manufacturing method according to the present invention involves processing a base material (100) comprising a wire rod, and includes: a cold forming step (c) for subjecting the base material (100) to cold forming to fabricate a helical formed material (102); a quenching step (e) for quenching the formed material (102); and an electrically heated tempering step (f) for subjecting the formed material (103) that has been quenched to tempering by means of electrical heating.

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Inventors:
TAKEDA KAZUYA (JP)
NAGAYASU GO (JP)
TSUKADA KOUTA (JP)
Application Number:
PCT/JP2022/043557
Publication Date:
April 11, 2024
Filing Date:
November 25, 2022
Export Citation:
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Assignee:
NHK SPRING CO LTD (JP)
International Classes:
B21F35/00; C21D1/09; C21D1/40; C21D9/02; F16F1/02
Domestic Patent References:
WO2020026716A12020-02-06
WO2013099821A12013-07-04
Foreign References:
JPS5711741A1982-01-21
JPS312152B11956-03-26
JPS58213825A1983-12-12
JPS5938329A1984-03-02
JPS6130246A1986-02-12
JPH08134545A1996-05-28
JP2003073737A2003-03-12
JP2011195919A2011-10-06
JP2011195921A2011-10-06
JP2016191445A2016-11-10
US6235131B12001-05-22
US20110031666A12011-02-10
Attorney, Agent or Firm:
SAKAI INTERNATIONAL PATENT OFFICE (JP)
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