Timepiece Mobile NiP Coating for Stable Escapement Lubrication
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Solution Overview
Problem
Swiss lever escapement mechanisms made of nickel-plated steel are sensitive to magnetic fields and perform poorly in certain climatic conditions, leading to degradation of performance, amplitude irregularity, and lubricant loss.
Innovation Solution
A method involving a substrate made of nickel-phosphorus (NiP12) coated with a thin layer of low-phosphorus nickel or nickel-boron to enhance lubricant adhesion and stability, using galvanic or chemical deposition methods, ensuring a non-magnetic character and improved lubrication.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If nickel-phosphorus (LIGA) material is used for escape wheel and anchor, then non-magnetic behavior is achieved, but lubricant adhesion deteriorates under certain climatic conditions
Solution Approach 1:
The patent applies composite materials by combining nickel-phosphorus substrate with a nickel-boron coating layer. The substrate provides non-magnetic properties while the coating layer provides improved lubricant adhesion, creating a composite structure that resolves the contradiction between magnetic sensitivity and lubricant retention.
Solution Approach 2:
The patent changes the surface composition parameters by applying a nickel-boron coating with specific boron content (0.5-5 atomic percent) on the nickel-phosphorus substrate. This parameter modification of the surface layer improves lubricant adhesion while maintaining the bulk non-magnetic properties.
2Object-affected harmful factors
If nickel-phosphorus material is used for escapement components, then non-magnetic character is achieved, but performance stability under climatic variations deteriorates
Solution Approach 1:
The composite structure of nickel-phosphorus substrate with nickel-boron coating provides both non-magnetic behavior and enhanced performance stability. The coating layer acts as a protective barrier that maintains consistent tribological properties under varying climatic conditions while the substrate maintains non-magnetic characteristics.
3Object-affected harmful factors
If similar LIGA materials are used for both anchor and escape wheel, then non-magnetic behavior is achieved, but friction couple performance deteriorates
Solution Approach 1:
The patent applies local quality by differentiating the surface properties of the escapement components. The nickel-boron coating is applied specifically to the contact surfaces of the escape wheel and anchor, creating locally optimized friction surfaces with different tribological properties from the bulk material, thereby improving friction couple performance while maintaining non-magnetic behavior.
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
Enhances lubricant adhesion and stability under various climatic conditions, maintaining consistent amplitude and reducing aging of escapement components.
Implementation Method 1
the substrate is coated, by galvanic and/or chemical means, at the level of at least one surface of the substrate of the movement
Implementation Method 2
the substrate is coated, by galvanic and/or chemical means, at the level of at least one surface of the substrate of the movement
Implementation Method 3
addition of a coating in the form of a layer of galvanic nickel (Ni) preferably, or of chemical nickel (for example NiP6-9), or even of nickel-boron deposited by chemical means, on a LIGA NiP12 escape wheel greatly improves the performance of the movements
Data Source
AI summary
Method for manufacturing a timepiece mobile, in which a substrate is produced with a first material comprising at least nickel and phosphorus, the substrate is shaped to the geometry of the mobile, and the substrate is galvanically or chemically coated, on at least one surface of the mobile substrate, with at least one second material which constitutes the peripheral layer of the mobile on the at least one surface of the mobile substrate, and which comprises at least nickel and which has less phosphorus than the first material, or which comprises nickel and lacks phosphorus.