Differential decoupling method employed in MRF spotting process

This paper proposes a new approach to obtain the magnetorheological finishing (MRF) removal function based on the spot in plane geometry, especially for aspheric optics whose curvature changes successively. With research of the mechanism of MRF, the multi-factor interaction model is established, with which the Differential Decoupling Method (DDM) for procuring MRF spot is developed. The DDM is used to decouple the geometry factor from the complicated factors that determine the MRF process. The DDM indicates that the variation of removal rate changes linearly with the variation of immersion depth. In the 20 experimental locations, good coefficients of determination are found, with 17 locations above 90% and 3 above 80%, respectively. Besides, the figures for transition of peak removal rate and volume removal rate reach 92% and 94% respectively, experimentally confirming our conclusions. (authors)