Laser Heat Treatment of Watch Components for Uniform Hardening
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Solution Overview
Problem
Traditional heat treatment methods for watch components, such as those made of carbon steel and martensitic stainless steel, face issues of heterogeneity in material properties due to size and heating kinetics, and require significant energy consumption, with ovens operating continuously to maintain thermal stability.
Innovation Solution
A laser-based heat treatment process that involves irradiating the entire component with a focused laser beam to achieve uniform heating, followed by rapid cooling in a gas flow, allowing for efficient and repeatable thermal treatment of small watch components with reduced energy consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If traditional furnace heat treatment is used, then components can be heat-treated in batches, but material properties become heterogeneous due to size and heating kinetics variations
Solution Approach 1:
The patent replaces the traditional mechanical furnace heating system with a laser-based heating system. The laser beam directly heats the component surface, enabling precise control of heating kinetics and eliminating the heterogeneous material properties that occur in batch furnace treatment. This substitution allows for consistent thermal treatment regardless of component size or position within the treatment chamber.
2Reliability
If furnace operates continuously to maintain thermal stability, then heat treatment can be performed, but energy consumption increases significantly
Solution Approach 1:
The patent uses periodic laser pulses instead of continuous furnace operation. The laser beam is activated only when heat treatment is required, delivering energy in controlled pulses that heat the component to the necessary temperature. This periodic action eliminates the need for continuous furnace operation, dramatically reducing energy consumption while maintaining the required thermal treatment effectiveness.
3Strength
If oil quenching is used for rapid cooling, then hardening is achieved, but geometric defects and surface quality deteriorate
Solution Approach 1:
The patent replaces oil quenching with gas flow quenching. A controlled gas flow (such as air or inert gas) is directed at the heated component to achieve rapid cooling and hardening. This pneumatic approach eliminates the surface defects, geometric distortions, and contamination that occur with liquid oil quenching, while still achieving the necessary hardness and mechanical properties.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This method ensures consistent material properties across components, significantly reduces energy consumption by minimizing the need for continuous oven operation, and eliminates the drawbacks of traditional oil quenching, such as geometric defects and energy inefficiency.
Implementation Method 1
heating the component by irradiating it with a laser beam
Implementation Method 2
heating the component in its entirety and homogeneously
Implementation Method 3
cooling the component in a gaseous flow
Data Source
Figure 1
Figure 2~4
Figure 5~7
AI summary
Heat treatment process for a watch component (1), the process comprising the following steps: - heating the component by irradiation with a laser beam of at least 80%, or even at least 90%, of the surface of the component projected parallel to the direction of the laser beam, then - cooling the component in a gaseous flow.