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Manufacturing method for a watch movement of the balance spring / mechanical oscillator for self-correction of the balance spring and a balance assembly, the balance spring
Manufacturing method for a watch movement of the balance spring / mechanical oscillator for self-correction of the balance spring and a balance assembly, the balance spring
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机译:用于游丝的自动校正的游丝/机械振荡器的钟表机芯和游丝组件的制造方法,游丝
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摘要
The autocompensating hairspring is made from a paramagnetic alloy of. Niobium and Zirconium containing 5%-25% of. Zirconium by weight and having a thermal coefficient of. Young's. Modulus such that a function (1/E).(DE/DT) + 3 alpha s - 2 alpha b tends to zero, E being. Young's. Modulus, T the temperature, alpha s the thermal coefficient of expansion of the hairspring and alpha b the thermal coefficient of expansion of the balance wheel. The alloy should include at least 500 ppm by weight of a doping agent containing oxygen and is formed from wire by pressing or drawing in oxygen followed by cold working to form a ribbon. The ribbon is spiralled and heat treated at pressure to reduce the thermal coefficient of the Young's. Modulus by controlled precipitation of phases rich in. Zirconium.
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