HOLLOW COIL SPRING MANUFACTURING METHOD

Title:

HOLLOW COIL SPRING MANUFACTURING METHOD

Document Type and Number:

WIPO Patent Application WO/2017/159935

Kind Code:

A1

Abstract:

The present invention relates to a hollow coil spring manufacturing method. The purpose of the present invention is to provide a hollow coil spring manufacturing method wherein, in connection with manufacturing a coil spring using a hollow member, the manner of processing ends of the hollow member is improved such that the durability of the hollow coil spring can be improved compared with that according to the prior art. To this end, the present invention provides a hollow coil spring manufacturing method characterized by comprising the steps of: fixing a hollow member to a first chuck and fixing a finish member to a second chuck (S10); maintaining the first and second chucks in proximity with each other such that the finish member is forced against an end of the hollow member and rotating at least one of the first and second chucks, thereby generating frictional heat (S20); bringing the first and second chucks in closer proximity such that the hollow member and the finish member are more tightly forced against each other, thereby coupling the hollow member and the finish member, when parts of contact between the finish member and the hollow member are melted by the frictional heat occurring between the finish member and the hollow member, thereby sealing one end of the hollow member (S30); repeating the steps S10 to S30 such that the finish member is coupled to the other end of the hollow member and seals the same (S40); removing burrs formed on the parts of coupling between the hollow member and the finish member after the step S30 or S40 (S50); heating a coupled body configured by installing the finish member on both ends of the hollow member (S60); and helically winding the coupled body that has been heated through the step S60, thereby forming a coil spring (S70).

Inventors:

KIM JIN YOUNG (KR)
PARK IK SOO (KR)
KIM CHOUNG HYOUNG (KR)
LEE SIL GOON (KR)

Application Number:

PCT/KR2016/009439

Publication Date:

September 21, 2017

Filing Date:

August 25, 2016

Export Citation:

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Assignee:

DAEWON KANG UP CO LTD (KR)

International Classes:

B21F35/00; B21F3/06; B21F15/04; B23K20/12; F16F1/04; F27B9/02; F27B9/36; F27D11/10

Foreign References:

JPH08501497A	1996-02-20
JP2009263711A	2009-11-12
KR20130050293A	2013-05-15
JP2760111B2	1998-05-28
KR101116808B1	2012-02-28
KR20120037591A	2012-04-20