Anti-drift processing method of watch hairspring

Abstract

An anti-drift processing method of a watch hairspring comprises the following steps: step 1: shaping: firstly, putting the hairspring in front of a parcel into a shaping furnace for processing; step 2: cleaning: soaking the shaped hairspring into a cleaning agent for cleaning, and then soaking the hairspring in the mixture of oleic acid and ammonia water for heating; step 3: oxidizing: placing the cleaned hairspring in a heat treatment furnace for processing with air as a medium, thus causing the hairspring surface to evenly form an oxide layer; and step 4: passivating: putting the oxidized hairspring in a curing furnace for processing at the temperature of 100-150 DEG C with nitrogen gas as a medium. The method has the beneficial effects of forming a uniform oxide layer on the hairspring surface, passivating the oxide layer of the hairspring surface, and completing the drift of torque moment within a short time; furthermore, the processing process is performed at a lower temperature, which does not cause change of crystal lattice in the hairspring material and can greatly reduce the frequency drift of an oscillating system, thus the watch keeps more accurate and stable time.

Description

technical field [0001] The invention relates to a metal heat treatment method, in particular to an anti-drift treatment method for watch hairsprings. Background technique [0002] The basic structure of a mechanical watch includes: a prime mover system, a transmission system, an escapement governor, an oscillation system, 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 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 watch hairspring is a helical spring made of constant elastic alloy wire. When the watch is running, the hairspring needs to perform 160 to 190 million times...

AI Technical Summary

Problems solved by technology

[0004] However, the above-mentioned 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. As a result, the frequency of the oscillating system drifts, usually as a gradual increase in frequency, which will cause a rate of change of about 10 seconds per day after one year