Horology Component Scallop Texture for Friction Management
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Solution Overview
Problem
Friction between timepiece components leads to wear particle formation and lubricant drainage, causing accelerated wear and degradation of friction contact conditions.
Innovation Solution
A scalloping structure with troughs and peaks is created on friction surfaces using the DRIE process, allowing for debris evacuation and lubricant reservoir functions, maintaining the natural alignment and texture in the direction of friction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If two perfectly smooth contact surfaces are used, then the initial friction contact conditions are optimal, but the lubricant gradually drains away resulting in medium and long term degradation
Solution Approach 1:
The invention applies a scalloping structure only in the friction area of the component, while other areas remain smooth. This localized texturing creates micro-troughs that retain lubricant and capture wear particles, improving long-term friction conditions without affecting the overall manufacturing precision of the component
Solution Approach 2:
The scalloping structure is pre-formed on the friction surface before the component enters service. This preliminary action of creating the textured pattern ensures that lubricant retention cavities and particle capture zones are already in place, preventing degradation from the outset rather than addressing it after wear begins
2Productivity
If conventional DRIE process is used, then the component is machined efficiently, but scalloped profiles are formed which are considered defects to be eliminated
Solution Approach 1:
The invention converts the scalloped profile, traditionally viewed as a harmful defect from the DRIE process, into a beneficial feature. The scallops create micro-troughs that serve as lubricant reservoirs and wear particle traps, transforming what was considered a manufacturing imperfection into a functional advantage that improves friction contact conditions
Solution Approach 2:
Instead of eliminating the scalloped profile through additional oxidation and deoxidation steps as conventionally done, the invention inverts the approach by deliberately retaining and utilizing the scallops. This reversal of the conventional post-processing strategy maintains the productive efficiency of DRIE while repurposing its characteristic output as a functional feature
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
The solution effectively reduces wear and maintains optimal friction conditions by facilitating debris removal and lubricant retention, enhancing the longevity and performance of micromechanical components.
Implementation Method 1
The manufacturing method used is the DRIE process (deep reactive ion etching). This process causes the formation of scallops or undulations on the etched wall of the component.
Implementation Method 2
Numerous timepiece components, such as escapement components, jumpers, springs, etc., are subjected to friction during use. Friction between two bodies generally causes the formation of wear particles forming a third body.
Implementation Method 3
To prevent such wear and reduce the friction forces that result in losses for certain functions, lubrication is applied to the surfaces of the components that come into friction contact.
Data Source
AI summary
A system including two components intended to be in friction contact with each other in a given direction, wherein the friction occurs in a functional area, wherein the system is at least one of the two components including, on a surface in the functional area, a texture formed of a series of troughs of rounded shape separated by peaks or a series of bumps of rounded shape separated by troughs, the troughs extending parallel in the given direction and allowing for the evacuation of debris produced by friction and serving as a reservoir for a lubricant. A method for manufacturing at least one component or a mold by the DRIE (deep reactive ion etching) process, wherein surface defects on the sidewalls machined by the DRIE process are used to form the troughs.