SPIRAL SPRING FOR A CLOCK MECHANISM, IN PARTICULAR A WRIST WATCH, AND A METHOD FOR MAKING SAME Russian patent published in 2019 - IPC G04B17/06 C22C27/02 

FIELD: manufacturing technology.

SUBSTANCE: invention relates to a spiral spring for balance made from niobium and titanium alloy with a substantially single-phase structure and a method for production thereof. Proposed method comprises making billet from niobium-based alloy consisting of niobium – residue up to 100 wt%, titanium – from 40 to 49 wt %, trace amounts of elements selected from a group consisting of O, H, C, Fe, Ta, N, Ni, Si, Cu, Al, each of which is present in amount of 0 to 1,600 ppm by weight, and total amount thereof is not more than 0.3 wt%; step of performing β-work hardening at specified diameter so that titanium of niobium-based alloy is present in form of solid solution with niobium in β-phase, and content of titanium in α-phase is not more than 10 vol%; at least one stage of alloy deformation alternating with at least one stage of heat treatment. Number of stages of heat treatment and deformation is limited so that obtained alloy retains structure, in which titanium of niobium-based alloy is substantially in form of a solid solution with niobium in β-phase with titanium content in α-phase of not more than 10 vol%, and had elastic limit of not less than 600 MPa and modulus of elasticity of not more than 100 GPa. Prior to the last stage of heat treatment, a coiling step is performed to produce a spiral spring.

EFFECT: invention provides limiting sensitivity to magnetic fields and improving heat compensation.

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