EP 3671359 B1 20230426 - MANUFACTURING METHOD OF A TIMEPIECE SPIRAL SPRING MADE OF TITANIUM
Title (en)
MANUFACTURING METHOD OF A TIMEPIECE SPIRAL SPRING MADE OF TITANIUM
Title (de)
HERSTELLUNGSVERFAHREN EINER SPIRALFEDER EINES UHRWERKS AUF TITANBASIS
Title (fr)
PROCÉDÉ DE FORMATION D'UN RESSORT SPIRALE D'HORLOGERIE À BASE TITANE
Publication
Application
Priority
EP 18215265 A 20181221
Abstract (en)
[origin: US2020201254A1] A spiral timepiece spring with a two-phase structure, made of a niobium and titanium alloy, and method for manufacturing this spring, including: producing a binary alloy containing niobium and titanium, with: niobium: the remainder to 100%; titanium: strictly greater than 60% and less than or equal to 85% by mass of the total, traces of components from among O, H, C, Fe, Ta, N, Ni, Si, Cu, Al; applying deformations alternated with heat treatments until a two-phase microstructure is obtained comprising a solid solution of niobium with β-phase titanium and a solid solution of niobium with α-phase titanium, the α-phase titanium content being greater than 10% by volume, wire drawing to obtain wire able to be calendered; calendering or insertion into a ring to form a mainspring, in a double clef shape before it is wound for the first time, or winding to form a balance spring.
IPC 8 full level
G04B 1/14 (2006.01); G04B 17/06 (2006.01); G04B 17/22 (2006.01)
CPC (source: CN EP KR RU US)
B21C 1/02 (2013.01 - US); C22C 14/00 (2013.01 - CN US); C22C 27/02 (2013.01 - US); C22F 1/002 (2013.01 - CN); C22F 1/02 (2013.01 - CN); C22F 1/183 (2013.01 - CN US); G04B 1/145 (2013.01 - CN EP KR US); G04B 17/06 (2013.01 - RU); G04B 17/066 (2013.01 - CN EP); G04B 17/227 (2013.01 - EP)
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 3671359 A1 20200624; EP 3671359 B1 20230426; CN 111349814 A 20200630; CN 111349814 B 20220524; JP 2020101527 A 20200702; JP 6954978 B2 20211027; KR 102320621 B1 20211102; KR 20200079188 A 20200702; RU 2727354 C1 20200721; US 11650543 B2 20230516; US 2020201254 A1 20200625
DOCDB simple family (application)
EP 18215265 A 20181221; CN 201911326726 A 20191220; JP 2019212905 A 20191126; KR 20190163654 A 20191210; RU 2019142569 A 20191219; US 201916693481 A 20191125