Abstract
This research employed the methods of simulation analysis and experiment to study the movement trend of the glass melt and the deviation of the junction position of the surfaces in the spin-casting process of the bifocal mirror. By comparing the measurement result of the surface shape in the experiment with the predicted result of that in the simulation, the deviation between these two results is 6.5μm. It is proved that the simulation can predict the surface shape of the mirror blank obtained by spin-casting of the bifocal mirror. Through the results of simulation and experiment, it is found that there is a significant deviation between the junction position of the reflecting surfaces and the expected one. Therefore, by changing the position of the insulation wall, the purpose of compensation for the junction position of the surfaces can be achieved. When the insulation wall was set at different positions for many times of iterative simulation calculation, the deviation of the junction position of the surfaces was reduced from 4.358mm to 3.76 μm.
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