Use of the ‘Precessions’™ process for prepolishing and correcting 2D &amp; 2½D form

Walker, David D.; Freeman, R. R.; Morton, R.; McCavana, Gerry; Beaucamp, Anthony

doi:10.1364/oe.14.011787

Cited by 77 publications

(33 citation statements)

References 6 publications

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“…The standard polishing slurries was used in this process. Precession motion was induced to produce a mathematically well-behaved near-Gaussian influence function [12]. The bonnet polisher rocked about its pole through precise CNC control of the position and orientation of a spinning.…”

Section: Introductionmentioning

confidence: 99%

Investigation on tool function and removal characteristics for bonnet surfacing

Feng

Cheng

2015

MATEC Web of Conferences

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Abstract. Since computer controlled optical surfacing (CCOS) processes have been proposed in the 1960s, many processes are developed for precision optics successfully. In this present work, a novel approach, the precessions process, is proposed and used for large segments fabrication. The removal function of bonnet polisher based on velocity and pressure distribution, which are obtained from the geometry of the process tool-motion and Hertzian contact theory respectively, are simulated. A dynamic finite element analysis (FEA) model is constructed to optimize process parameters. At last, detailed experimental studies are carried out to verify the optimal parameters.

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Section: Introductionmentioning

confidence: 99%

Investigation on tool function and removal characteristics for bonnet surfacing

Feng

Cheng

2015

MATEC Web of Conferences

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“…Our group has newly developed a novel bonnet polishing [7,[9][10] tool, which is semi-rigid, called "SR bonnet" [11]. The polishing pressure between the SR bonnet and the work-piece is mainly influenced by z-offset and the inflated-pressure.…”

Section: Introductionmentioning

confidence: 99%

Effect of the inflated-pressure to the tool influence function for polishing using SR bonnet

Wang

Zhong³

et al. 2014

SPIE Proceedings

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The purpose of this paper is to study the effect of the inner pressure to the tool influence function (TIF) for polishing using a semi-rigid (SR) bonnet tool. The simulation model of a Semi-rigid (SR) bonnet polishing tool polishing BK7 is demonstrated and the pressure distribution data under different inflated-pressures in the contact area has been extracted. It's observed that the inflated-pressure has few effects to the polishing pressure, and their shapes are also Gaussian-like. Hence, we made a hypothesis that the effect of inflated-pressure to the TIF is rather small. To verify this hypothesis, a group of experiments to generate TIFs under different inflated-pressure are conducted, and the hypothesis has been proved to be correct through comparing these TIFs.

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“…An innovative CNC polishing process based on tool precession has been described in the literature [9,10] at various stages during its development. We summarize the operation of the process as follows: the position and orientation (precession angle) of a spinning, inflated, membrane-tool are actively controlled as it traverses the surface of a workpiece.…”

Section: Introductionmentioning

confidence: 99%