Title:
HEATING METHOD FOR COIL SPRING, HEATING DEVICE FOR END COIL PART, AND COIL SPRING
Document Type and Number:
Japanese Patent JP2020020027
Kind Code:
A
Abstract:
To provide a heating method of a coil spring, in which uneven heating can be circumvented in the coil spring having an end coil part, and to provide a heating device for the end coil part, and the coil spring.SOLUTION: A heating method of a coil spring heats a coil spring 1 composed of a wire material W extending in a spiral shape and having an end coil part 2 in which a cross-sectional area changes along the extending direction by defining a cross-sectional area of the wire material W in the orthogonal direction with respect to the extending direction of the wire material W as a cross-sectional area, and a general part 3 which is continuous to the end coil part 2 and in which a cross-sectional area is constant along the extending direction. The heating method of the coil spring includes: an end coil part heating step of heating the end coil part 2 by adjusting a thermal load in consideration of the change in cross-sectional area; and a general part heating step of heating the general part 3 before or after the end coil part heating step.SELECTED DRAWING: Figure 3
Inventors:
ITO TORU
ITO HIDEKAZU
ITO HIDEKAZU
Application Number:
JP2018147138A
Publication Date:
February 06, 2020
Filing Date:
August 03, 2018
Export Citation:
Assignee:
CHUO HATSUJO KK
International Classes:
C21D9/02; F16F1/06; H05B6/36
Domestic Patent References:
| JP2015000993A | 2015-01-05 | |||
| JP2000326036A | 2000-11-28 | |||
| JPS312152B1 | 1956-03-26 |
Foreign References:
| WO2013099821A1 | 2013-07-04 | |||
| CN206299721U | 2017-07-04 | |||
| US6235131B1 | 2001-05-22 |
Attorney, Agent or Firm:
Tomoaki Higashiguchi
Shindo Motoko
Shindo Motoko
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