Mechanical Part Decoration With Conformal Masking and Electroforming
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Solution Overview
Problem
Existing decoration methods for mechanical parts, such as watch dials, face issues with burrs on decorative elements and material leakage, leading to scrapped parts and inadequate anchoring of decorative elements.
Innovation Solution
A method where a masking layer is directly formed on the mechanical part, with a first bonding layer promoting adhesion and a second bonding layer enhancing anchoring, using electroforming and filling with conductive materials to create precise, firmly anchored decorative elements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a mask is placed on the surface of the mechanical part to be decorated, then the decorative elements can be made and fixed to the mechanical part in the same step, but the mask may not be in intimate contact with the surface, causing filling material to leak onto the surface
Solution Approach 1:
The patent replaces the mechanical mask system with a photoresin-based photolithography system. Instead of physically placing and pressing a mask onto the surface, the photoresin is deposited as a liquid or aerosol that conformally coats the surface, then cured to form the mask pattern. This eliminates the contact issues inherent in mechanical masks while maintaining precise definition of decorative elements.
Solution Approach 2:
The photoresin mask forms a flexible, conformal thin film that adapts to the surface topology of the mechanical part. This flexible film ensures intimate contact with complex surfaces without requiring rigid mechanical pressure, preventing material leakage while allowing precise patterning of decorative elements.
2Device complexity
If a mask is used to form decorative elements, then the process is simpler, but burrs are created on the decorative elements that require additional finishing operations
Solution Approach 1:
The patent changes the material parameters of the mask from rigid (mechanical mask) to soft/conformal (photoresin). This parameter change allows the mask to flex and adapt to surface irregularities during the filling process, preventing burr formation on the decorative elements while maintaining process simplicity.
3Manufacturing precision
If decorative elements are made separately and then fixed to the mechanical part, then the elements can be precisely manufactured, but additional fixing steps are required
Solution Approach 1:
The patent merges the mask formation and decorative element creation into a single integrated process. The photoresin mask is formed, then the cavity is filled with decorative material directly through the mask opening, combining what would otherwise be separate operations into one efficient workflow that maintains precision while improving productivity.
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 intimate contact between the masking layer and the part, preventing material leakage, achieving precise decorative elements with improved adhesion and anchoring, simplifying finishing operations and reducing scrap rates.
Implementation Method 1
a photoresin mask is formed by photolithography
Implementation Method 2
filling the volume delimited by the masking layer and the surface to be decorated of the mechanical part by means of a filling material in which it is desired to produce the decorative elements
Data Source
Figure 1~4
Figure 5~7
Figure 8~11
AI summary
The invention relates to a method for decorating at least one surface to be decorated (4) of a mechanical part comprising the following steps: - to obtain the mechanical part to be decorated on which at least one decorative element (2a, 2b) is to be made according to a determined thickness and contour; - to deposit on the surface to be decorated (4) of the mechanical part a masking layer (6) having a thickness at least equal to the thickness of the decorative element (2a, 2b) to be made; - to provide in the masking layer (6) at least one opening (14a, 14b) which coincides with the location on the surface to be decorated (4) of the mechanical part where the decorative element (2a, 2b) is to be made, the cavity (14a, 14b) having a contour which corresponds to the contour of the decorative element (2a, 2b) to be made and defining a volume with the surface to be decorated of the mechanical part;- deposit a bonding layer (28) made of an electrically conductive material over the masking layer (6) and on the surface to be decorated (4), in the places where the cavities (14a, 14b) are provided, to promote the adhesion of the decorative elements (2a, 2b); - fill the volume delimited by the masking layer (6) and the surface to be decorated (4) of the mechanical part with a filler material in which the decorative elements (2a, 2b) are to be made, and - remove the masking layer (6).