Surface Micro-Texturing With Printed Etchant for Precise Riblets
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Solution Overview
Problem
Current methods for manufacturing micro-textures on aerodynamic surfaces, such as riblet patterns, are inefficient and costly, making it difficult to achieve durable and scalable drag reduction on large surfaces like aircraft, due to challenges in precise positioning and durability of materials.
Innovation Solution
A method involving the controlled deposition and removal of a subtractive agent using an etchant, printed onto a substrate surface to form micro-riblets or other textures, utilizing an inkjet printer with a programmable nozzle assembly and controller for precise control and scalability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If traditional machining or grinding methods are used to manufacture micro-textures, then manufacturing precision can be achieved, but productivity is low and cost is high
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 surface to chemically remove material and form micro-textures, substituting mechanical energy with chemical energy for material removal, thereby achieving high precision micro-texturing with improved productivity
Solution Approach 2:
The patent changes the state of the etchant from liquid to aerosol form. By converting the etchant into fine droplets or particles suspended in gas, the solution achieves better coverage and penetration on the substrate surface, improving etching uniformity and precision while maintaining high productivity
2Object-affected harmful factors
If plastic film riblets are molded and applied to surfaces, then drag reduction can be achieved, but reliability is poor due to degradation and positioning difficulties
Solution Approach 1:
Instead of applying pre-fabricated plastic film riblets, the patent directly creates the riblet micro-texture pattern on the substrate surface through chemical etching. The desired riblet geometry is copied onto the surface by selective material removal, eliminating the need for separate film application and bonding processes, thereby improving reliability and durability
Solution Approach 2:
The patent merges the micro-texture fabrication process with the substrate manufacturing process. The riblet pattern is created directly on the substrate surface during or after substrate production, integrating two separate processes (substrate manufacturing and texture application) into one, which eliminates bonding issues and material degradation problems
3Productivity
If conventional etching methods are used, then material removal can be achieved, but manufacturing precision is poor due to lack of control
Solution Approach 1:
The patent segments the etchant application process by dividing the continuous etchant flow into discrete aerosol droplets or particles. This segmentation allows precise control over etchant distribution, exposure time, and concentration at different locations on the substrate, enabling high precision micro-texture formation while maintaining efficient material removal
Solution Approach 2:
The patent introduces an aerosolization system as an intermediary between the etchant reservoir and the substrate surface. The aerosolization process converts liquid etchant into fine suspended droplets that can be precisely controlled and delivered to the substrate, providing better control over etching precision while maintaining high 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
Enables the cost-effective and precise creation of durable micro-textures on large surfaces, improving drag reduction and fluid dynamics, suitable for applications like aircraft surfaces, while reducing manual labor and enhancing production efficiency.
Implementation Method 1
dissolving substrate material in the etchant
Data Source
AI summary
A method of micro-texturing a surface is disclosed. The method includes printing an etchant onto a substrate surface and forming a micro-texture on the substrate surface by removing material from the substrate surface.