Edge control in CNC polishing, paper 2: Simulation and validation of tool influence functions on edges

Hongyu Li, David Walker, Guoyu Yu, Andrew Sayle, Wilhelmus Messelink, Rob Evans, Anthony Beaucamp

Research output: Contribution to journalArticle

42 Citations (Scopus)

Abstract

Edge mis-figure is regarded as one of the most difficult technical issues for manufacturing the segments of extremely large telescopes, which can dominate key aspects of performance. A novel edge-control technique has been developed, based on 'Precessions' polishing technique and for which accurate and stable edge tool influence functions (TIFs) are crucial. In the first paper in this series [D. Walker Opt. Express 20, 19787-19798 (2012)], multiple parameters were experimentally optimized using an extended set of experiments. The first purpose of this new work is to 'short circuit' this procedure through modeling. This also gives the prospect of optimizing local (as distinct from global) polishing for edge mis-figure, now under separate development. This paper presents a model that can predict edge TIFs based on surface-speed profiles and pressure distributions over the polishing spot at the edge of the part, the latter calculated by finite element analysis and verified by direct force measurement. This paper also presents a hybrid-measurement method for edge TIFs to verify the simulation results. Experimental and simulation results show good agreement.

Original languageEnglish
Pages (from-to)370-381
Number of pages12
JournalOptics Express
Volume21
Issue number1
DOIs
Publication statusPublished - 14 Jan 2013
Externally publishedYes

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