Surface Micro-Texturing With Printed Maskant and Selective Etching
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Solution Overview
Problem
Existing manufacturing methods for durable microstructures on aerodynamic surfaces, such as riblet textures, are slow, costly, and impractical for large-scale production, limiting their implementation in commercial aircraft due to challenges in precise positioning and bonding of thin sheets.
Innovation Solution
A method involving controlled deposition of a masking material followed by selective removal of substrate material using an etchant, facilitated by an inkjet printer with programmable control, to create micro-textures like riblets or lotus leaf patterns on aircraft surfaces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If traditional machining or grinding methods are used to create microstructures, then manufacturing precision can be achieved, but productivity is too slow for large-scale production
Solution Approach 1:
The patent replaces traditional mechanical machining and grinding methods with a chemical etching process. An etchant solution is applied to the substrate to chemically remove material and form microstructures, eliminating the need for mechanical contact and enabling faster, large-scale production while maintaining precision through controlled chemical reactions.
Solution Approach 2:
The patent changes the fundamental parameter of material removal from mechanical force to chemical reaction. By controlling etchant concentration, exposure time, and temperature, precise microstructures can be formed rapidly across large surfaces, resolving the contradiction between precision and productivity.
2Device complexity
If plastic films with riblet patterns are molded and applied to aerodynamic surfaces, then manufacturing complexity is reduced, but reliability deteriorates due to degradation under atmospheric conditions and bonding difficulties
Solution Approach 1:
The patent extracts the microstructure formation process from separate applied films and integrates it directly into the substrate surface. By etching riblet patterns directly into the aircraft skin or panel material, the structure becomes an integral part of the substrate, eliminating bonding issues and degradation problems associated with separate plastic film applications.
Solution Approach 2:
The patent creates a composite structure where the microtexture is formed within the substrate material itself rather than as a separate layer. This integration ensures the texture maintains the same mechanical and environmental properties as the base material, significantly improving reliability under atmospheric conditions.
3Manufacturing precision
If maskant is printed only on non-treated surfaces using refrigerant or fluid coating, then manufacturing precision improves, but loss of substance increases due to material waste
Solution Approach 1:
The patent replaces refrigerant-based or fluid coating methods with inkjet printing technology. The inkjet system deposits maskant material precisely only where needed through digitally controlled droplet placement, eliminating the excessive material application and waste associated with conventional coating methods while maintaining high precision.
Solution Approach 2:
The inkjet printing system uses a digitally controlled process that applies maskant material only in the exact patterns and quantities required. The system self-regulates material deposition based on digital design files, preventing over-application and reducing substance loss while achieving high manufacturing precision.
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
Enables efficient and precise manufacturing of micro-textures with desired fluid dynamic effects, reducing skin friction and enhancing aerodynamic properties, suitable for large-scale production.
Implementation Method 1
forming a micro-texture on the substrate surface by removing material from the exposed surface zones, wherein the step of forming a micro-texture on the substrate by removing material includes printing an etchant on the substrate surface, and removing the etchant from the substrate
Data Source
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AI summary
A method of micro-texturing a substrate surface is disclosed, including printing a maskant (328) on the substrate surface to define exposed surface zones on the substrate surface. The method further includes forming a micro-texture on the substrate surface by removing material from the exposed surface zones, and removing the maskant (328) from the substrate surface.