軸対称非球面の高精度切削に関する研究 : 工具の各種誤差要因が形状誤差に与える影響およびその最適補正法の検討

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This paper deals with the precision machining of an axi-symmetric aspherical surface for optical lens molding dies by use of diamond tool. At first, the effects of the tool radius error and the tool positioning errors (horizontal directions) on the workpiece form accuracies are simulated and its compensation methods are discussed. And a compensation system for the tool deviation profile was developed, which can compensate the tool path based on the tool deviation profile. The tool deviation profile is calculated from the post-process measured data of the machined workpiece surface profiles. Finally, in the aspherical turning lests, the molding dies of electroless deposited nickeli-hosphorous (Ni-P) alloy for plastic lenses are examined. The experimental results show that the workpiece accuracies were improved by this new compensating system and a form accuracy of less than ±0.1 μ m was obtained even in the case of using an inferior tool.
1999-03-05