Patent ID: 11913106
Assignee: SAS INNO TECH CONSEILS
Field: Materials, metallurgy (Chemistry)
Classification: CPC C  G | IPC C  G

Claim 13:
14. A method for the manufacture of a timepiece spring according to claim 4, said method comprising:
work hardening of the alloy at a work-hardening rate greater than or equal to 50%;
forming the spring based on the work-hardened alloy; and
heat treatment of the formed alloy at a temperature comprised between 300° C. and 600° C. during a time comprised between 2 and 30 min;
said work-hardening step comprises:
introducing the alloy into a tooling used for work hardening said alloy, said alloy having a temperature of less than 500° C. when it is introduced into the tooling used for the work hardening; and
heating the tooling used for work hardening said alloy at a temperature comprised between 150° C. and 500° C.