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Computerized modelling and process control for automatic shaping and aspherization of axisymmetric surfaces of optical workpieces

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Abstract

This paper describes program OSA, intended for the modelling and process control of automatic shaping and aspherization of axisymmetric optical surfaces by means of a polishing method. The program makes it possible to calculate the regions where the tool contacts the workpiece and to determine the speeds and pressures, the removal functions of the tool, and the optimum surface-processing sequence for removing a given layer of the allowance. Results are given for the modelling of the processing of a convex spherical workpiece with a full-size solid tool, a small tool, an annular tool, and a mask tool, and it is shown to be efficient to control the shaping processes by means of the OSA program that has been developed.

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