Global Patent Index - EP 3502288 B1

EP 3502288 B1 20201014 - METHOD FOR MANUFACTURING A HAIRSPRING FOR CLOCK MOVEMENT

Title (en)

METHOD FOR MANUFACTURING A HAIRSPRING FOR CLOCK MOVEMENT

Title (de)

HERSTELLUNGSVERFAHREN EINER SPIRALFEDER FÜR UHRWERK

Title (fr)

PROCÉDÉ DE FABRICATION D'UN RESSORT SPIRAL POUR MOUVEMENT D'HORLOGERIE

Publication

EP 3502288 B1 20201014 (FR)

Application

EP 17209686 A 20171221

Priority

EP 17209686 A 20171221

Abstract (en)

[origin: US2019196406A1] A method for manufacturing a balance spring for a balance, which includes creating a blank from an alloy containing: niobium: the remainder to 100 wt %, titanium: between 40 and 60 wt %, traces of elements selected from the group formed of O, H, C, Fe, Ta, N, Ni, Si, Cu, Al, between 0 and 1600 ppm by weight individually, and less than 0.3 wt % combined; β-quenching the blank, such that the titanium of the alloy is essentially in solid solution form with β-phase niobium, the α-phase titanium content being less than or equal to 5% by volume, at least one deformation step of the alloy alternated with at least one heat treatment step such that the niobium and titanium alloy obtained has an elastic limit higher than or equal to 600 MPa and a modulus of elasticity lower than or equal to 100 GPa, a winding step to form the balance spring being performed prior to the final heat treatment step, prior to the deformation step, a step of depositing, on the alloy blank, a surface layer of a ductile material such as copper, to facilitate the wire shaping process, the thickness of the deposited ductile material layer is chosen such that the ratio of the area of ductile material to the area of NbTi alloy for a given cross-section of wire is less than 1.

IPC 8 full level

C22C 14/00 (2006.01); C22C 27/02 (2006.01); G04B 17/06 (2006.01); G04B 17/22 (2006.01); G04B 43/00 (2006.01)

CPC (source: CN EP US)

B21F 35/04 (2013.01 - US); C21D 8/06 (2013.01 - US); C21D 8/1266 (2013.01 - US); C21D 8/1277 (2013.01 - US); C21D 9/02 (2013.01 - US); C22C 27/02 (2013.01 - EP US); G04B 17/06 (2013.01 - CN); G04B 17/063 (2013.01 - US); G04B 17/066 (2013.01 - CN EP US); G04B 17/227 (2013.01 - EP US); G04B 43/007 (2013.01 - EP); G04B 43/007 (2013.01 - US)

Citation (examination)

Citation (opposition)

Opponent : e-Patent SA,

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Designated contracting state (EPC)

AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR

DOCDB simple family (publication)

EP 3502288 A1 20190626; EP 3502288 B1 20201014; CN 110007582 A 20190712; CN 110007582 B 20210309; JP 2019113549 A 20190711; JP 6751749 B2 20200909; RU 2696809 C1 20190806; US 2019196406 A1 20190627

DOCDB simple family (application)

EP 17209686 A 20171221; CN 201811562272 A 20181220; JP 2018234274 A 20181214; RU 2018145229 A 20181220; US 201816211289 A 20181206