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Hairspring materials for mechanical timepieces and hairsprings using them

A mechanical and watch technology, applied to mechanically driven clocks, clocks, mechanical equipment, etc., can solve problems such as deviation of Young's modulus, and achieve the effect of prolonging life

Active Publication Date: 2016-08-17
CITIZEN WATCH CO LTD +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] However, although the temperature change of the Young's modulus of the hairspring material used by the present inventors is extremely small, the Young's modulus of the hairspring obtained from this material may vary, and there is still room for improvement.

Method used

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  • Hairspring materials for mechanical timepieces and hairsprings using them
  • Hairspring materials for mechanical timepieces and hairsprings using them
  • Hairspring materials for mechanical timepieces and hairsprings using them

Examples

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Effect test

preparation example Construction

[0046]

[0047] The hairspring material for a mechanical timepiece of the present invention can be obtained by, for example, suitably forming a compound by adjusting the amounts of each component to the above-mentioned range, and melting the compound in a vacuum melting furnace to obtain an ingot. It should be noted that, based on Fe in the obtained alloy, the content of each element of Ni, Cr, Ti, and Be is in the above-mentioned range, and the raw materials are mixed to form a compound, but in the process of forming the compound Among them, Mn, Al, and C (carbon) are not intentionally added. Alternatively, they may be added as long as they are suppressed within the above-mentioned range in the obtained alloy, but in the present invention, they are elements that should be treated as impurities after all.

[0048] In addition, the hairspring of the present invention is obtained from the above-mentioned hairspring material of the present invention. Specifically, the hairspri...

Embodiment 1

[0054] According to the composition shown in Table 1 as Example 1, each component was adjusted to form a compound, and the compound was melted in a vacuum induction furnace to produce an ingot. This ingot was subjected to hot forging at 800 to 1200° C., and formed into a rod shape of Φ20 mm. Next, melt treatment, pickling, and cold drawing are repeated. The melt treatment is carried out at 800-1200° C. for 30-120 minutes. After the final cold drawing, cold rolling is performed, and an aging treatment (helical reconstruction aging treatment) is performed to form a spiral hairspring. The aging treatment is performed at 560° C. for 120 to 180 minutes. Thus a hairspring is obtained. Among them, the thickness and width of the hairspring are 32 μm and 100 μm, respectively.

Embodiment 2

[0056] A balance spring was obtained in the same manner as in Example 1 except that the aging treatment temperature was set at 580°C.

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Abstract

[Problem] To provide a hairspring material for mechanical timepieces that can reduce the variation in Young's modulus compared to conventional ones. [Solution] The hairspring material for a mechanical timepiece of the present invention is formed of an alloy containing 37.5 to 39.5% by mass of Ni, 9.2 to 9.9% by mass of Cr, 0.35 to 0.55% by mass of Ti and 0.6 to 0.9% by mass of Be, and the balance contains Fe and unavoidable impurities; as the aforementioned unavoidable impurities, C (carbon), more than 0% by mass and less than 0.5% by mass of Mn, and more than 0% by mass % and less than 0.03% by mass of Al to suppress the aforementioned C (carbon) to 0.03% by mass or less.

Description

technical field [0001] The present invention relates to a hairspring material for mechanical timepieces and a hairspring obtained from the hairspring material. Background technique [0002] like figure 1 As shown, the governor 1 of a mechanical timepiece is generally composed of an escape wheel 10 , a pallet fork 20 and a balance wheel 30 . To the balance wheel 30 is fixed a balance spring 40 which is a thin plate spring having a multi-turn spiral shape. Specifically, the inner end of the hairspring 40 is fixed to a collet attached to the center axis of the balance wheel 30 , that is, the balance shaft, and the outer end of the hairspring 40 is fixed to a stud 42 . As far as mechanical timepieces are concerned, through the operation of the balance spring 40 , the reciprocating motion transmitted by the pallet fork 20 can be transformed into a certain regular and reasonable vibration cycle, and the rotation of the balance wheel 30 can be adjusted. [0003] As a material fo...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/00C22C38/50F16F1/10C21D9/02
CPCC21D9/02C22C38/00C22C38/50F16F1/10C22C38/002C22C38/06C22C38/04C22C38/02G04B17/06
Inventor 平居芳郎松本伸一土屋建治山本晋司
Owner CITIZEN WATCH CO LTD