Development of non-axisymmetric aspheric ultraprecision machining using FPGA-based piezoelectric FTS

Abstract

With increasing demands in photoelectric industry, the non-axisymmetric aspherical machining for manufacturing specific optical components such as head up display for car with very short projection distance and astigmatic compensation lens for the laser diode is more and more essential. In this study, a field programmable gate array (FPGA)-based fast tool servo (FTS) using piezoelectric (PZT) tool holder was implemented for performing non-axisymmetric aspherical machining. Detail system implementation was described, experimental examinations for static and dynamic characteristics of the tool holder were presented, dry run test for the FTS function was conducted, and finally, the system was successfully verified by means of practical machining experiment, and measurement for 3D form accuracy based on the Levenberg-Marquardt algorithm (LMA). Future works are to configure a compensation methodology according to the evaluated form error.