Polishing Tool With Segmented Elastic Layer For Deflection Control
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Solution Overview
Problem
Existing polishing tools for optical workpieces, such as lenses, face challenges in achieving precise and deterministic polishing due to radial deflection and center offset issues during the polishing process, leading to errors in surface alignment and accuracy.
Innovation Solution
A polishing tool with a two-part elastic intermediate layer, where the portion adjacent to the base is harder and stiffer, and the portion adjacent to the polishing foil is softer and more elastic, combined with a rigid and joint-free tool carrier connection, reduces radial deflection and center offset, allowing for precise adaptation to varying lens geometries and surfaces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a one-piece elastic intermediate layer is used, then the polishing foil can adapt to the surface geometry, but the polishing tool strongly deflates or tilts away from the center axis during compression
Solution Approach 1:
The intermediate layer is divided into two distinct portions: a first portion adjacent to the base and a second portion adjacent to the polishing foil. This segmentation allows each portion to have different mechanical properties, with the first portion providing structural support and the second portion providing adaptation to the surface geometry, thereby preventing excessive deflection while maintaining adaptability.
Solution Approach 2:
Different portions of the intermediate layer are assigned different material properties: the first portion is designed to be harder and stiffer, while the second portion is designed to be softer and more elastic. This local differentiation of material properties allows the structure to simultaneously maintain alignment and adapt to surface variations without excessive deflection.
2Manufacturing precision
If a two-part foam carrier with varying hardness is used, then radial deflection is reduced, but the structure becomes more complex
Solution Approach 1:
The intermediate layer is segmented into two portions with different hardness values. This segmentation is achieved through distinct material selection or layered construction, allowing the first portion to provide rigidity and the second portion to provide compliance, thereby controlling radial deflection while maintaining a relatively simple overall structure.
Solution Approach 2:
The intermediate layer utilizes composite construction by combining materials with different mechanical properties in a single component. The first portion uses a harder, stiffer material while the second portion uses a softer, more elastic material, creating a composite structure that optimizes both deflection control and adaptability without significant complexity increase.
3Manufacturing precision
If the polishing tool is made more rigid to reduce deflection, then center offset is reduced, but the ability to adapt to non-symmetric lenses is compromised
Solution Approach 1:
The intermediate layer exhibits local quality differentiation where the first portion is harder and stiffer to reduce overall deflection and center offset, while the second portion is softer and more elastic to maintain adaptation to non-symmetric lens surfaces. This localized property variation allows the tool to be rigid enough for precision while remaining flexible enough for adaptability.
Solution Approach 2:
By segmenting the intermediate layer into two portions with different mechanical properties, the system achieves both rigidity for precision and flexibility for adaptation. The first portion provides the structural framework that limits deflection, while the second portion provides the compliance needed to conform to varying lens geometries.
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 configuration enables precise polishing with reduced radial deflection and center offset, ensuring accurate surface contact and high removal rates, even on non-symmetric lenses like toric lenses, while preventing the polishing tool from lifting off the workpiece edge.
Implementation Method 1
the second portion is softer and/or more elastic and/or more yielding
Implementation Method 2
the first portion is thicker, harder/less elastic, stiffer and/or denser than the second portion
Data Source
AI summary
A polishing tool and a device for polishing a workpiece with a corresponding polishing tool are proposed, the polishing tool having an elastic intermediate layer with two portions/parts of different hardness, the portion/part close to the processing surface being softer than the portion/part of the intermediate layer remote from the processing surface.