Title:
METHOD AND APPARATUS FOR MANUFACTURING ARC SPRING
Document Type and Number:
WIPO Patent Application WO/2021/193211
Kind Code:
A1
Abstract:
Provided is a method for manufacturing an arc spring whereby the formation of twists in an arc spring after blasting can be inhibited. In this manufacturing method, wedges 21 are sequentially driven into spiral-shaped gaps 9a in a semi-finished product 5A of an arc spring 1 before a wire X thereof has been curved, at least one of the driving positions at which the wedges 21 have been sequentially driven in is shifted in the circumferential direction to increase the twist, in the arc spring 1, produced by the driving in of the wedges 21 when the semi-finished product 5A is curved to shape the arc spring 1, and the arc spring 1 is blasted to impart a twist in the opposite direction, with respect the twist in the arc spring 1, to cancel out the twist.
Inventors:
MAEDA MASAAKI (JP)
TAKAHASHI SHUJI (JP)
TAKAHASHI SHUJI (JP)
Application Number:
PCT/JP2021/010461
Publication Date:
September 30, 2021
Filing Date:
March 15, 2021
Export Citation:
Assignee:
NHK SPRING CO LTD (JP)
International Classes:
B21F35/00; F16F1/06
Domestic Patent References:
| WO2019026373A1 | 2019-02-07 |
Foreign References:
| JP6538486B2 | 2019-07-03 | |||
| JPS58192643A | 1983-11-10 | |||
| JP2010255742A | 2010-11-11 | |||
| JP2007009915A | 2007-01-18 | |||
| US20080209731A1 | 2008-09-04 |
Attorney, Agent or Firm:
SUDO Yuichi et al. (JP)
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