Fiducial-aided on-machine positioning method for precision manufacturing of optical freeform surfaces

Wang, Shixiang, Cheung, Chifai, Ren, Mingjun and Liu, Mingyu (2018) Fiducial-aided on-machine positioning method for precision manufacturing of optical freeform surfaces. Optics Express, 26 (15). pp. 18928-18943. ISSN 1094-4087

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Fiducial-aided on-machine positioning method for precision manufacturing of optical freeform surfaces
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Abstract

There are still significant challenges in accurate positioning of optical freeform surfaces on the machine tool and the measurement instrument due to the high accuracy requirement and their complex shapes. This paper proposes a Fiducial-aided On-machine Positioning method (FAOPM) that combines the on-machine measurement and off-machine measurement to precisely position optical freeform surfaces during precision manufacturing cycle including rough machining, fine machining, measurement, and error compensation. The FAOPM makes use of fiducials which are firstly measured in coordinate measuring machine with nanometric accuracy to generate a Fiducial-aided Computer Aided Design (FA-CAD) of the designed optical surface, then the developed on-machine measuring device obtains the accurate positions of the fiducials after remounting in the machining coordinate system. Finally the relative position of the workpiece is identified so that the associated cutting paths and compensation tool path can be easily generated. Several optical freeform surfaces were experimentally machined to prove the capability of the proposed method. The results indicate that the positions of the workpiece during the precision manufacturing and measurement cycle were precisely achieved and the form accuracy of the optical freeform surfaces was remarkable improved based on the FAOPM.

Keywords:fiducial-aided, on-machine, precision manufacturing, optical freeform surfaces
Subjects:H Engineering > H700 Production and Manufacturing Engineering
Divisions:College of Science > School of Engineering
ID Code:53937
Deposited On:19 Apr 2023 14:06

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