Title:
固定式時計又は携行式時計のムーブメントのための渦巻き状のばね及びその製造方法
Document Type and Number:
Japanese Patent JP6764915
Kind Code:
B2
Abstract:
The present invention relates to a spiral spring for a balance wheel made of an alloy of niobium and titanium with an essentially single-phase structure, and the method of manufacture thereof which comprises:a step of producing a blank in a niobium-based alloy consisting of:niobium: balance to 100 wt %,titanium: between 40 and 49 wt %,traces of elements selected from the group consisting of O, H, C, Fe, Ta, N, Ni, Si, Cu, Al, between 0 and 1600 ppm by weight individually, and cumulatively less than 0.3 wt %,a step of type β hardening of said blank at a given diameter, in such a way that the titanium of the niobium-based alloy is essentially in the form of a solid solution with niobium in β phase, the content of titanium in α phase being less than or equal to 10 vol %,at least one deformation step of said alloy alternating with at least one step of heat treatment, the number of steps of heat treatment and of deformation being limited so that the niobium-based alloy obtained retains a structure in which the titanium of the niobium-based alloy is essentially in the form of a solid solution with niobium in β phase, the content of titanium in α phase being less than or equal to 10 vol % and it has an elastic limit greater than or equal to 600 MPa and an elastic modulus less than or equal to 100 GPa, a step of winding to form the spiral spring being carried out before the last heat treatment step.
Inventors:
Christian Charbon
Application Number:
JP2018204827A
Publication Date:
October 07, 2020
Filing Date:
October 31, 2018
Export Citation:
Assignee:
Niva Rocks-Far Society Anonymous
International Classes:
G04B17/06; C22C27/02; C22C30/00
Domestic Patent References:
| JP2005140674A | ||||
| JP6021015U | ||||
| JP2002332531A | ||||
| JP2001081537A | ||||
| JP2003004866A |
Foreign References:
| WO1996041382A2 | ||||
| WO2015189278A2 | ||||
| GB1166701A |
Other References:
社団法人日本金属学会,金属データブック,日本,丸善株式会社,1993年 3月25日,改訂3版第5刷,第571頁,ISBN 4-621-03825-7
Attorney, Agent or Firm:
Shigeki Yamakawa
Yuzo Koike
Masaki Yamakawa
Yuzo Koike
Masaki Yamakawa