Oxidation coloring process for watch hairspring

A process method and hairspring technology, applied in the direction of metal material coating process, coating, solid diffusion coating, etc., can solve the problems of lack of beauty in appearance, increase in frequency, frequency drift of oscillation system, etc. Small frequency drift, the effect of increasing added value

Inactive Publication Date: 2007-01-17
TIANJIN SEAGULL WATCH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, this existing high-temperature short-term heat treatment process for watch hairsprings has the following disadvantages: the heat treatment speed for shaping is too fast, the rapid cooling of the hairspring may easily cause lattice vacancies inside the material, the γ-phase body is not uniformly precipitated, and a large internal stress is generated inside the material , thus causing the frequency of the oscillating system to drift, usually manifested as a gradual increase in frequency, which will cause a rate of change of about 10 seconds per day after one year
[0005] In addition, the surface color of the hairspring after heat treatment is the natural color of the alloy, and the appearance lacks aesthetic feeling, which does not meet the requirements of watches with exposed moving parts such as tourbillon watches and hollow watches that have been popular in recent years.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] This embodiment is for a bare balance spring without a collet, and its oxidation coloring process includes:

[0022] Step 1: Cleaning: First, soak the hairspring in cleaning agent 2# for cleaning for 10-20 minutes to remove oil stains and coolant residues attached to the surface of the hairspring; then soak the hairspring in a mixed solution of oleic acid and ammonia water and heat to Cook at 80-90°C for about 20 minutes to remove fine particles attached to the surface of the hairspring.

[0023] Step 2: Oxidation and coloring: Put the cleaned hairspring into a quartz tube and put it into a heat treatment furnace with air as the medium at a temperature of 380°C to 450°C for 2 to 12 minutes, so that the surface of the hairspring is uniformly formed with a thickness of 20 to 200nm yellow, red, blue or black oxide layer.

[0024] In step 2, if the cleaned hairspring is put into a quartz tube and placed in a heat treatment furnace with air as the medium at a temperature of...

Embodiment 2

[0031] This embodiment is for a bare balance spring without a collet, and its oxidation coloring process includes:

[0032] Step 1: Cleaning: First, soak the hairspring in cleaning agent 2# for cleaning for 10-20 minutes to remove oil stains and coolant residues attached to the surface of the hairspring; then soak the hairspring in a mixed solution of oleic acid and ammonia water and heat to Cook at 80-90°C for about 20 minutes to remove fine particles attached to the surface of the hairspring.

[0033] Step 2: Oxidation coloring: Immerse the cleaned hairspring in the dilute sulfuric acid solution with a molar ratio of 10% in the anodic oxidation tank, and treat it for 20-30 seconds under the condition of 15-30V low voltage, so that the surface of the hairspring is evenly formed. 20-200nm yellow, red, blue or black oxide layer.

[0034] In step 2, if the cleaned hairspring is immersed in the dilute sulfuric acid solution with a molar ratio of 10% in the anodizing tank, and tr...

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Abstract

The present invention discloses a oxidation and coloring technology of watch hairsprings that includes: Step 1, washing: washing the hairspring in detergent and cooking in the mixed solution of oleic acid and ammonia; Step 2, oxidation and coloring: placing the washed hairsprings in the quartz tube, putting into the heat treatment furnace and treating for 2-12 minutes at 380DEG C-450DEG C in the air medium to form a colorized oxide layer of 20-200nm thin on the hairspring surface; Step 3, curing: treating the hairspring at 180-200DEG C for 5-6 hours in the medium of nitrogen or oxygen in the curing oven to cure the oxide layer. There are some advantages as follows: the hairspring is passivated during oxidation and coloring and completes torsional moment drift in a short time; the hairspring presents yellow, red, blue or black color to increase the additional value.

Description

technical field [0001] The invention relates to a metal heat treatment method, in particular to an oxidation and coloring process for watch balance springs. Background technique [0002] The basic structure of a mechanical watch includes: a prime mover system, a transmission system, an escapement governor, a pointer system and a winding needle system. When the balance wheel is deviated from its equilibrium position by an external force and starts to swing, the balance spring is twisted to generate potential energy, which provides a restoring torque for the balance wheel, so as to ensure that the oscillation system has an oscillation period that is basically unattenuated. It can be seen that the watch hairspring is an indispensable part to ensure the accuracy and stability of the mechanical watch. [0003] The hairspring of a watch is a helical spring made of alloy wire with constant elasticity. When the watch is running, the hairspring needs to be tightened and expanded rep...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C8/12C23C8/80C23C8/02C23G1/00
Inventor 荣桂林高晨光
Owner TIANJIN SEAGULL WATCH CO LTD
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