Additively Manufactured Corner Cube Substrate for Thermal Stability
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Solution Overview
Problem
Conventional methods for producing open-air corner-cube retroreflectors, such as those using machined aluminum or stainless steel substrates, are costly due to inefficient machining processes and are prone to thermal deformation, while replication methods face challenges with high processing costs and fragility.
Innovation Solution
The use of additive manufacturing technologies like 3D printing and 3D laser sintering to form substrates with minimal subsequent machining, allowing for the replication of a reflective surface using a master coated with reflective material, reducing material usage and processing costs, and enhancing thermal stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional machining processes (milling or EDM) are used to produce substrates from aluminum or stainless steel, then the substrate can be manufactured with precise geometry, but the processing cost increases significantly and production time is extended
Solution Approach 1:
The patent replaces conventional mechanical machining processes (milling, EDM) with additive manufacturing technology to produce substrates. This substitution eliminates the need for time-consuming material removal operations while maintaining geometric precision, thereby resolving the contradiction between manufacturing precision and productivity.
Solution Approach 2:
The patent changes the manufacturing approach from subtractive (machining) to additive (3D printing) processes. This fundamental parameter change in the manufacturing method allows for direct fabrication of complex geometries without the productivity losses associated with conventional machining, while still achieving the required precision through controlled deposition processes.
2Stability of the object's composition
If stainless steel substrates are used due to lower thermal expansion, then thermal stability is improved, but the processing cost increases due to the hardness of the material requiring EDM machining
Solution Approach 1:
The patent replaces expensive EDM machining of hard stainless steel with additive manufacturing processes. This substitution eliminates the need for costly EDM operations while maintaining the ability to use stainless steel or other thermally stable materials, thereby resolving the contradiction between thermal stability and ease of manufacture.
Solution Approach 2:
The patent changes the manufacturing methodology from subtractive machining to additive fabrication, which fundamentally alters the relationship between material hardness and manufacturing cost. Hard materials like stainless steel can now be manufactured cost-effectively through additive processes, resolving the contradiction between achieving thermal stability through material selection and maintaining ease of manufacture.
3Ease of manufacture
If aluminum substrates are used for quick and easy machining, then manufacturing cost is reduced, but thermal deformation occurs due to higher coefficient of thermal expansion
Solution Approach 1:
The patent replaces conventional machining with additive manufacturing, which eliminates the thermal deformation issues associated with machining aluminum while maintaining ease of manufacture. The additive process builds parts layer-by-layer without the high localized heats of machining operations.
4Manufacturing precision
If replication methods are used to produce open-air corner cubes, then the reflective surface can be transferred to the substrate, but the process remains costly and the resulting product is fragile
Solution Approach 1:
The patent combines the substrate fabrication and reflective surface application into a single integrated additive manufacturing process. This merging eliminates the need for separate replication operations, reducing processing costs while maintaining the precision of reflective surface placement through direct fabrication.
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 approach reduces production costs, enhances thermal stability, and allows for the creation of lightweight, durable corner-cube retroreflectors with precise geometry, suitable for various applications including precision measurement and optical assemblies.
Implementation Method 1
An adhesive is applied to the corner-cube cavity so that when the adhesive cures and the master is withdrawn from the corner-cube cavity, the reflective surface adheres to the adhesive and remains an integral part of the retroflector
Implementation Method 2
The techniques involve additively forming a substrate by way of additive manufacturing technologies such as three-dimensional printing and 3D laser sintering
Data Source
AI summary
Techniques are disclosed to enable manufacture of open-air corner-cube retroreflectors having a corner-cube cavity. The techniques involve additively forming a substrate by way of additive manufacturing technologies such as three-dimensional printing technologies. The techniques further involve optionally machining the additively formed surface of the substrate and replicating a reflective surface in the corner-cube cavity using a master that is coated with a reflective material. An adhesive is applied to the corner-cube cavity so that when the adhesive cures and the master is withdrawn from the corner-cube cavity, the reflective surface adheres to the adhesive and remains an integral part of the retroreflector.