Optical surfacing device with flexible rim constraint
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Solution Overview
Problem
Existing optical surfacing tools often suffer from appearance defects such as the 'orange skin' and 'sheeplike' effects due to uneven pressure distribution and deformation, which are difficult to eliminate despite modifications like a flexible pad with a diameter greater than the interface.
Innovation Solution
Incorporating a flexible rim that extends from the pad to the interface, constraining pressure distribution and limiting lateral expansion, while maintaining sufficient deformation capacity to match the surface shape, thereby reducing pressure peaks and improving surface quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the flexible pad has a diameter greater than the diameter of the interface to eliminate appearance defects, then the surface appearance is improved, but the device complexity increases and the pad deformation capacity is reduced
Solution Approach 1:
The pad structure is segmented into two functional zones: a central active surfacing area and a peripheral annular rim. This segmentation allows the central area to deform freely for surface matching while the peripheral rim provides lateral constraint, resolving the contradiction between pad size and deformation capacity.
Solution Approach 2:
Different regions of the pad are given different mechanical properties: the central area is highly flexible for deformation, while the peripheral rim is stiffer for lateral constraint. This local differentiation allows simultaneous achievement of surface matching and appearance quality without increasing overall complexity.
2Area of stationary object
If the flexible pad is made larger to cover more surface area, then the surfacing coverage is improved, but the pressure distribution becomes uneven and appearance defects increase
Solution Approach 1:
The pad is divided into a central active zone and a peripheral rim, where the rim acts as a constraint boundary. This segmentation prevents excessive lateral expansion and ensures uniform pressure distribution across the contact area, eliminating pressure peaks that cause appearance defects.
Solution Approach 2:
The peripheral rim functions as a flexible constraint shell that limits lateral expansion of the pad during surfacing. This flexible boundary maintains pad coverage area while preventing uneven pressure distribution, as the rim adapts to surface curvature without allowing excessive deformation.
3Manufacturing precision
If the interface is made more compliant to match surface curvature, then the surface fitting is improved, but the pressure peaks at edges increase causing appearance defects
Solution Approach 1:
The interface is differentiated into a central compliant region for surface matching and a peripheral constraint region. The central area maintains high compliance for curvature adaptation, while the peripheral rim provides lateral constraint to prevent pressure peaks, thus eliminating appearance defects without sacrificing surface fitting accuracy.
Solution Approach 2:
The peripheral rim acts as a flexible constraint shell that limits lateral expansion of the interface. This flexible boundary allows the central interface to deform for surface matching while preventing excessive deformation at edges that would create pressure peaks and appearance defects.
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
The tool achieves improved surface quality by uniformly distributing pressure and reducing defects like 'orange skin' and 'sheeplike' effects, enhancing surfacing parameters with increased pressure and speed.
Implementation Method 1
an elastically compressible interface attached to the rigid support... The flexible rim opposes lateral expansion of the interface
Implementation Method 2
applying sufficient pressure to it so that, by deformation of the interface, the pad espouses the shape of the optical surface
Implementation Method 3
The surfacing operation necessitates an abrasive, which can be contained in the pad or in the fluid
Data Source
AI summary
A surface device includes a rigid holder (11), an elastically compressible interface (12) connected to the rigid holder, a flexible pad (13) adapted to be applied onto the surface to be machined (30) and a flexible belt (14) applied against and partially covering the side surface (18) of the interface (12), an annular portion (21) of the side surface (18) of the interface (12) being free between the belt (14) and the holder (11).