Masking Layer Decoration for Mechanical Parts

Solution Overview

Problem

Existing methods for decorating mechanical parts, such as watch dials, face issues with masks not being in close contact with the surface, leading to filling material leaks and potential discarding of expensive parts, especially in the horological field.

Innovation Solution

A method involving a masking layer directly formed on the mechanical part's surface, with openings and cavities to precisely produce decoration elements, ensuring close contact and strong adhesion, using materials like amorphous metals and a chromium-gold bonding layer, and removing the masking layer post-decorating.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If a mask is placed on the surface of the mechanical part to be decorated, then the decoration elements can be produced directly on the mechanical part in the same step, but the mask may not be in close contact with the surface, causing filling material to leak and requiring discarding of expensive parts

Engineering Contradiction:

Improvedecoration process efficiencyVSAvoidcontact between mask and surface

Core Design Contradiction:

ProductivityVSReliability

Solution Approach 1:

The masking layer is applied to the surface before the filling operation, creating a preliminary structure that defines the decoration element geometry. This preliminary action ensures the mask is in close contact with the surface from the outset, preventing filling material leakage while enabling direct production of decoration elements on the mechanical part in the same step.

Inventive Principle:

Principle #10Preliminary action

2Productivity

If a mask is placed on the surface of the mechanical part to be decorated, then the decoration elements can be produced directly on the mechanical part in the same step, but the filling material may leak on the surface requiring discarding of some mechanical parts

Engineering Contradiction:

Improvedecoration process efficiencyVSAvoidloss of expensive mechanical parts

Core Design Contradiction:

ProductivityVSLoss of substance

Solution Approach 1:

The masking layer is applied to the surface before the filling operation, creating a preliminary structure that defines the decoration element geometry. This preliminary action ensures the mask is in close contact with the surface from the outset, preventing filling material leakage while enabling direct production of decoration elements on the mechanical part in the same step.

Inventive Principle:

Principle #10Preliminary action

3Manufacturing precision

If the masking layer is directly formed on the surface of the mechanical part, then close contact is ensured preventing filling material leaks, but the masking layer must be removed after decoration

Engineering Contradiction:

Improveprecision of decoration elementsVSAvoidnumber of process steps

Core Design Contradiction:

Manufacturing precisionVSDevice complexity

Solution Approach 1:

The masking layer is designed as a temporary, disposable component that is applied to the surface for the duration of the filling operation and then removed. This disposable masking layer ensures precise definition of decoration elements during the process while eliminating the need for complex permanent masking structures or repeated mask positioning operations.

Inventive Principle:

Principle #27Cheap short-living objects (Disposable)

Solution Approach 2:

The masking layer is discarded after serving its purpose of defining the decoration element geometry during the filling operation. This discarding of the temporary masking layer is a deliberate step in the process that enables precise decoration while simplifying the overall methodology by eliminating the need for mask reuse or complex removal mechanisms.

Inventive Principle:

Principle #34Discarding and recovering

4Ease of manufacture

If separate masks are machined and positioned on the mechanical part, then the process is more complex and time-consuming, but the masks can be reused

Engineering Contradiction:

Improvesimplicity of mask productionVSAvoidtime for mask machining and positioning

Core Design Contradiction:

Ease of manufactureVSLoss of time

Solution Approach 1:

The masking layer application and the decoration element definition are merged into a single integrated step. The masking layer is directly applied to the surface in close contact, simultaneously serving as both the mask structure and the template for decoration element geometry. This merging eliminates the separate steps of mask machining and positioning that would otherwise be required.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The masking layer is designed as a temporary, disposable component that is applied to the surface for the duration of the filling operation and then removed. This disposable masking layer ensures precise definition of decoration elements during the process while eliminating the need for complex permanent masking structures or repeated mask positioning operations.

Inventive Principle:

Principle #27Cheap short-living objects (Disposable)

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 high-precision decoration elements with strong adhesion, reducing the risk of detachment and material leaks, while simplifying and cost-reducing the decoration process by eliminating the need for separate mask machining and improving finishing operations.

Implementation Method 1

depositing a bonding layer on the surface to be decorated of the mechanical part before depositing the masking layer; the bonding layer is formed by a layer of chromium (Cr) whereon a layer of gold (Au) is deposited

Methodology Applied

Scientific EffectAdhesion: Adhesive

Implementation Method 2

etching, through the opening made in the masking layer, a cavity in the surface to be decorated of the mechanical part; the opening in the masking layer and the cavity in the mechanical part to be decorated are etched simultaneously using a laser beam

Methodology Applied

Scientific EffectLaser ablation: Laser Ablation

Implementation Method 3

the masking layer is made on the surface to be decorated of the mechanical part by galvanic growth

Methodology Applied

Scientific EffectGalvanic growth: Electrodeposition

Data Source

PatentUS11806744B2Method for decorating a mechanical part

Publication Date: 2023.11.07 COMADUR

AI summary

A method for decorating the surface of a mechanical part including structuring, on the surface to be decorated, a masking layer having a thickness that is at least equal to the thickness of the decoration element to be produced; making, in the masking layer, at least one opening that coincides with the location on the surface to be decorated where the decoration element is to be produced, the opening having a contour that is identical to the contour of the decoration element and defining a volume with the mechanical part; filling the volume delimited by the masking layer and the surface to be decorated of with a filling material wherein the decoration elements are sought to be produced; and removing the masking layer.