Theoretical Research On Disc Hydrodynamic Polishing Based On CCOS (Computer Controlled Optical Surfacing)

As one of the main methods to obtain better optical surface, polishing has beena major research on optical surfacing. Non-contacted polishing has some advantagessuch as micro removal and high machining precision, but the low processingefficiency has always been the restriction of its development. Based on the CCOS, thedisc hydrodynamic polishing was proposed, instead of point/line type process. Thebasic theory of the method was studied, the research route and method was proposed.Firstly, the distribution of working pressure and removal function in CCOS werestudied with the planetary motion mode. The impact of different wear loss on theworking function has also been discussed, one preliminary conclusion has beenobtained the wear loss has a great influence on the shape and intensity of removalfunction, the relationship between wear loss and removal function was established.Secondly, a typical model of the process was established, the removal function atfixed point was established by ICEM/FLUENT simulation and MATLAB numericalanalysis, the optimization of the removal function was executed by planet motion andcumulative time-sharing synthesis, the practical removal function was established,which was very close to the ideal removal function.Thirdly, taking the tending gene as the evaluation criteria of the center tendencyand the scatter factor of the rotation symmetry, the effects of eccentricity and thenumber of timeshare synthesis on the two indicators have been discussed.Finally, the matrix method was taken for solving the dwell time. Tikhonovregularization and similar iterative were used to solve the matrix equation. Theinfluence of stepping pitch on the methods was simulated. The results showed theintensive pitch can make a better accuracy in the similar iterative method, while aworse accuracy in the Tikhonov regularization possibly.This paper provided a theoretical basis for the research on disc polishing process,a technical route was established then, and the simulation experiments will be helpfulfor the experimental study as well as the actual processing.