LAUSR

Abstract In this research, the surface deviation between the reflector surface formed in spin casting and the desired curve obtained by theoretical calculation has been analysed. Furthermore, numerical simulation has been employed to compensate for the forming speed and the internal diameter of the mould in spin casting. Comparing the measurement results of the reflector surface processed in the spin casting forming experiment to the results of the numerical simulation, we have found that these two sets of results have relative high consistency. The deviation between the results by using these two methods is only 1.7 μm. Therefore, this research has employed the method of numerical simulation to calculate the geometric shape of the compensated mirror blank. Based on these results, the internal diameter of the compensate mould and the forming speed were also calculated. By using the modified parameters to conduct the spin casting forming experiment, the surface deviation of the mirror blank was successfully reduced from 55.61 μm to 2.82 μm.