Abstract
Ultra-precision fast tool servo (FTS) machining technology is an effective method for complex surface microstructure machining. However, as for a single degree-of-freedom FTS, it can only achieve a high-rate reciprocating movement in one direction; thus, it cannot realize ultra-precision machining for some complex microstructural surface. Therefore, a novel flexure-based fast tool servo device composed of two platforms and three branched chains is proposed in this work, which aims to realize a robotic ultra-precision machining with XYZ translational precision motion. Each of the branched chain is made up of a prismatic pair, two hook hinges, and a connecting rod. The FTS mechanism design and modeling are carried out firstly; then, the FTS device characterization in terms of statics analysis and modal analysis is conducted; in order to suppress the hysteresis nonlinearity and improve the positioning precision, a new repetitive-compensated PID controller combined with an inverted modified Prandtl-Ishlinskii model is proposed to handle this issue. It indicates that the displacement amplification ratio is 3.87; thus, the workspace can reach to [− 85, 85]∪[− 80,80]∪[0,120]μm3, and the closed-loop positioning precision is 600 nm, which will be considered to fulfill practical FTS machining tasks.
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Acknowledgements
This work was supported in part by the Natural Science Foundation of China (5160051494, U1601202), Science and Technology Program of Guangzhou (201510010058), Natural Science Foundation of Guangdong (2014A030310204), and Guangdong General Programs for Science and Technology (2015A010104009, 2015B010104008, 2015B010133005).
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Tang, H., Li, H., To, S. et al. Design and control of a new 3-PUU fast tool servo for complex microstructure machining. Int J Adv Manuf Technol 94, 3503–3517 (2018). https://doi.org/10.1007/s00170-017-1166-4
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DOI: https://doi.org/10.1007/s00170-017-1166-4