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Performance of a piezo-hydraulic fine positioning device: Experimental analyses with a scaled model

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Abstract

Automated fine positioning for machining of heavyweight components, such as gears for marine, mining or power engineering, offers significant potential for reducing setup process time. Therefore, a fine positioning system based on a novel compact piezo hydraulic pump has been developed. The system allows precision positioning of large components in 4 degrees of freedom (DOF). The presented design is able to compensate eccentric errors of ±2.5 mm, tumbling errors of ±0.1° of work pieces with a weight up to 4.7 t. A flexible circular membrane is used as a flexure bearing for the tumbling unit. The linear axes are crossed one above the other. Based on the original model, a scaled (1:31) tumbling unit was designed and realized for experimental analyses. The scaled prototype was analyzed regarding its stiffness and accuracy. Both values have been evaluated to be sufficiently high. A positioning accuracy of 4.5 µrad is expected for the original size model.

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Acknowledgements

This work was carried out within the transfer project “Piezo-hydraulic Micro-Positioning system as setup assistance for large components”. The authors want to thank the German Research Foundation (DFG) for funding this project.

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Authors and Affiliations

  1. Institute of Production Engineering and Machine Tools, Leibniz Universität Hannover, Garbsen, 30823, Germany

    Berend Denkena, Lars Hülsemeyer & Maik Bergmeier

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  1. Berend Denkena
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  2. Lars Hülsemeyer
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  3. Maik Bergmeier
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Correspondence to Maik Bergmeier.

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Denkena, B., Hülsemeyer, L. & Bergmeier, M. Performance of a piezo-hydraulic fine positioning device: Experimental analyses with a scaled model. Prod. Eng. Res. Devel. 11, 613–619 (2017). https://doi.org/10.1007/s11740-017-0752-5

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  • DOI: https://doi.org/10.1007/s11740-017-0752-5

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