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Method for manufacturing hairspring for clock movement

A technology for watch movements and hairsprings, applied in watches, mechanically driven clocks, frequency-stabilizing mechanisms, etc., can solve problems such as sticking and jamming

Pending Publication Date: 2020-11-10
NIVAROX FAR
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these alloys cause problems related to sticking and seizure in the drawing or wire drawing die (diamond or hard metal) and on the roll (hard metal or steel), so that it is almost impossible to use standard methods such as for steel. They transform into filaments

Method used

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Examples

Experimental program
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Embodiment Construction

[0027] The invention relates to a method of manufacturing a balance spring to be fitted to a balance wheel of a timepiece movement and made of an alloy containing niobium and hafnium.

[0028] The method includes the following steps:

[0029] - the step of making a billet made of niobium and hafnium alloys containing:

[0030] - Niobium: make up to 100% by weight,

[0031] - hafnium: between 5 and 60% by weight, preferably between 5 and 30% by weight, more preferably between 8 and 12% by weight,

[0032] - one or more elements selected from Ti, Zr, Ta and W, the percentage of each element being in the range of 0 to 2% by weight, preferably in the range of 0.2 to 1.5% by weight,

[0033] - Impurities, the total percentage of which is in the range of 0 to 0.5% by weight. More specifically, the impurities may be trace elements selected from O, H, C, Fe, N, Ni, Si, Cu, Al, Cr, Mn, V, Sn, Mg, Mo, Pb, Co, and B, each said element is present in an amount of 0 to 1,000 ppm by weig...

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Abstract

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.

Description

technical field [0001] The invention relates to a method of manufacturing a balance spring to be fitted to a balance wheel of a timepiece movement. It also concerns balance springs made of Nb-Hf alloys using this method. Background technique [0002] The manufacture of balance springs for timepieces is subject to constraints that often seem incompatible at first glance: [0003] - need to obtain high yield strength, [0004] - ease of manufacture, especially drawing and rolling operations, [0005] - excellent fatigue strength, [0006] - performance level stability over time, [0007] -Small cross section. [0008] The manufacture of the hairspring also focuses on temperature compensation to ensure a consistent level of timekeeping performance. This requires obtaining a thermoelastic coefficient close to 0. Hairsprings with limited sensitivity to magnetic fields were also pursued. [0009] Hairsprings have been developed using niobium and hafnium alloys. However, t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G04B17/06
CPCG04B17/066G04B17/06C22C27/02C22F1/18G04B17/063
Inventor C·沙邦
Owner NIVAROX FAR
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