Magnetorheological finishing (MRF) is a deterministic subaperture polishingprocess. Theprocess uses a magnetorheological (MR) fluid that consists of micrometer-sized, spherical, magnetic carbonyl iron (CI) particles, nonmagnetic polishing abrasives, water, and stabilizers. Material removal occurs when the CI and nonmagnetic polishing abrasives shear material off the surface being polished. We introduce a new MRF material removal rate model for glass. This model contains terms for the near surface mechanical properties of glass, drag force, polishing abrasive size and concentration, chemical durability of the glass, MR fluid pH, and the glass composition. We introduce quantitative chemical predictors for the first time, to the best of our knowledge, into an MRF removal rate model. We validate individual terms in our model separately and then combine all of the terms to show the whole MRF material removal model compared with experimental data. All of our experimental data were obtained using nanodiamond MR fluids and a set of six optical glasses.
© 2007 Optical Society of America
Optical Design and Fabrication
Original Manuscript: June 8, 2007
Revised Manuscript: August 24, 2007
Manuscript Accepted: August 24, 2007
Published: November 9, 2007
Jessica E. DeGroote, Anne E. Marino, John P. Wilson, Amy L. Bishop, John C. Lambropoulos, and Stephen D. Jacobs, "Removal rate model for magnetorheological finishing of glass," Appl. Opt. 46, 7927-7941 (2007)