Oxidation coloring process for watch hairspring

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

Oxidation and coloring process of watch balance spring technical field The invention relates to a metal heat treatment method, in particular to an oxidation and coloring process for watch balance springs. Background technique 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. The hairspring of a watch is a helical spring made of alloy wire with constant elasticity. When the watch is running, the hairspring needs...

AI Technical Summary

Problems solved by technology

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

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.