Ceramic Watch Arbor Machining with Laser and Tribofinishing
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Solution Overview
Problem
The machining of ceramic clock or watch components, particularly arbors with small diameters and precise geometries, is challenging due to surface defects and low impact toughness, as existing methods like femtosecond laser ablation result in unsatisfactory surface roughness and bending strength.
Innovation Solution
A method involving femtosecond laser machining followed by tribofinishing with specific laser wavelengths and parameters to achieve a surface roughness of less than 100 nm and subsequent tribofinishing within 10 hours using diamond abrasive particles, optimizing the ceramic components' geometry and mechanical durability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If femtosecond laser ablation is used to machine ceramic arbors, then machining time is reduced and tool wear is eliminated, but surface roughness becomes unsatisfactory and bending strength decreases
Solution Approach 1:
The machining process is divided into two distinct stages: first, femtosecond laser ablation removes material quickly to achieve the desired geometry; second, tribofinishing refines the surface to achieve the required roughness. This segmentation allows each process to be optimized independently, resolving the contradiction between machining speed and surface quality.
Solution Approach 2:
The laser machining performs preliminary material removal to create the basic geometry, preparing the surface for the subsequent tribofinishing process. This preliminary action eliminates the need for traditional multi-step machining, directly addressing the productivity improvement while setting up the surface for final refinement.
2Ease of manufacture
If femtosecond laser ablation is used to machine ceramic arbors, then tool wear is eliminated, but bending strength and reliability of the components decrease
Solution Approach 1:
The process separates the material removal function (laser ablation) from the surface refinement function (tribofinishing). This segmentation allows the laser to eliminate tool wear issues while the tribofinishing process restores surface integrity and bending strength, both processes optimized for their specific purposes.
Solution Approach 2:
Tribofinishing acts as an intermediary process between laser machining and the final component. It mediates the transition by refining the laser-machined surface, removing micro-defects, and restoring the surface properties necessary for high bending strength and reliability.
3Manufacturing precision
If traditional grinding is used to machine ceramic arbors, then surface quality and bending strength are maintained, but machining time increases significantly
Solution Approach 1:
The patent replaces traditional mechanical grinding with a hybrid approach: femtosecond laser ablation (optical field) for material removal, followed by tribofinishing (mechanical refinement). This substitution eliminates the time-consuming nature of pure mechanical grinding while maintaining surface quality through the tribofinishing stage.
Solution Approach 2:
The traditional single-step grinding process is segmented into laser ablation (for rapid material removal) and tribofinishing (for surface refinement). This segmentation allows the bulk material removal to be performed quickly by the laser, reserving the time-intensive tribofinishing for only the final surface layer.
4Manufacturing precision
If traditional cutting tools are used for bar turning of ceramic arbors, then geometric accuracy can be achieved, but tool wear is rapid and machining time is very long
Solution Approach 1:
Traditional mechanical cutting tools are replaced with femtosecond laser ablation for the primary material removal process. The laser's optical field interacts with the ceramic material without physical contact, eliminating tool wear and enabling faster machining while maintaining geometric accuracy through precise laser control.
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 produces ceramic components with improved geometric accuracy and enhanced bending strength, ensuring reliable and efficient production of clock or watch components with micron tolerance and adequate impact strength.
Implementation Method 1
The machining of ceramic clock or watch components... by femtosecond laser ablation. The lasers used have ultra-short pulses (femtosecond laser) so as not to have a thermal effect on the machined material.
Implementation Method 2
a tribofinishing step applied to the second surface so as to obtain said surface of revolution... using diamond abrasive particles
Data Source
AI summary
Method for producing a surface of revolution of a clock or watch component comprising a step of machining, with a femtosecond laser beam, a first surface of the clock or watch component so as to obtain a second surface, in particular so as to obtain a second surface whose roughness Ra is less than 100 nm, or less than 70 nm, and then a tribofinishing step applied to the second surface so as to obtain the surface of revolution.