EP 3889691 B1 20240221 - HOROLOGICAL HAIRSPRING MADE OF A NB-HF ALLOY
Title (en)
HOROLOGICAL HAIRSPRING MADE OF A NB-HF ALLOY
Title (de)
UHRSPIRALFEDER AUS NB-HF-LEGIERUNG
Title (fr)
SPIRAL HORLOGER EN ALLIAGE NB-HF
Publication
Application
Priority
- EP 21170773 A 20190507
- EP 19173114 A 20190507
Abstract (en)
[origin: CN111913380A] A method for manufacturing a balance spring intended to equip a balance of a horological movement, including a step of producing a blank made of a niobium and hafnium alloy including between 5 and 60wt %, preferably between 5 and 30 wt %, and more preferably between 8 and 12 wt % hafnium, a step of annealing and cooling the blank, at least one step of deforming the annealed blank in order to forma wire. The method includes, before the deformation step, a step of depositing, on the blank, a layer of a ductile material chosen from the group consisting of copper, nickel, cupronickel, cupro-manganese, gold, silver, nickel-phosphorus Ni-P and nickel-boron Ni-B, in order to facilitate the wire shaping operation. The invention further relates to a balance spring which is produced by the manufacturing method.
IPC 8 full level
G04B 17/06 (2006.01); C22C 27/02 (2006.01); C22F 1/18 (2006.01)
CPC (source: CN EP US)
C22C 27/02 (2013.01 - EP); C22F 1/18 (2013.01 - EP); G04B 17/06 (2013.01 - CN); G04B 17/063 (2013.01 - US); G04B 17/066 (2013.01 - CN EP US)
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 3736639 A1 20201111; EP 3736639 B1 20240703; CN 111913380 A 20201110; EP 3889691 A1 20211006; EP 3889691 B1 20240221; JP 2020183940 A 20201112; US 11550263 B2 20230110; US 2020356057 A1 20201112
DOCDB simple family (application)
EP 19173114 A 20190507; CN 202010372078 A 20200506; EP 21170773 A 20190507; JP 2020068864 A 20200407; US 202016831913 A 20200327