Abstract
Tracking interferometer based on bi-rotary milling head is a novel scheme to conduct volumetric accuracy measurement of a five-axis machine tool. The laser beam direction of the interferometer can be regulated to follow the retroreflector by moving the bi-rotary head. This is a low-cost implementation of multilateration measurement, and its measurement accuracy is mainly affected by the error motion of the rotary axes. This paper proposes an improved multilateration principle to identify the position-independen geometric errors of rotary axis and laser beam, and minimize their impact on the measurement uncertainty. A closed-loop tracking interferometer system installed on the spindle is developed to perform the measurement with high tracking accuracy. The device can be installed on an ordinary five-axis machine tool without modifying the machine tool structure. The proposed scheme is conducive to improving the accuracy and practical application of the tracking interferometer based on bi-rotary milling head. Experiments with the corresponding closed-loop tracking interferometer and uncertainty analysis are conducted to verify the performance of the proposed measurement scheme.
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This work was supported by the National Natural Science Foundation of China (Grant No. 51875357), the State Key Program of National Natural Science Foundation of China (Grant No. U21B2081), and the National Defense Science and Technology Excellence Youth Foundation (Grant No. 2020-JCJQ-ZQ-079).
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Tang, X., Xu, K., Bi, Q. et al. Improved closed-loop tracking interferometer measurement for a five-axis machine tool with a bi-rotary milling head. Sci. China Technol. Sci. 65, 1127–1136 (2022). https://doi.org/10.1007/s11431-021-2001-7
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DOI: https://doi.org/10.1007/s11431-021-2001-7