Accuracy in Force Estimation Applied on a Piezoelectric Fine Positioning System for Machine Tools
Eckart Uhlmann 1, 2,   Mitchel Polte 1, 2,   Florian Triebel 1  
,   Rasmus Overbeck 1,   Simon Thom 1
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Institute for Machine Tools and Factory Management IWF, TU Berlin, Germany
Institute for Production Systems and Design Technology IPK, Fraunhofer, Germany
Florian Triebel   

Institute for Machine Tools and Factory Management IWF, TU Berlin, Pascalstraße 8 - 9, 10587, Berlin, Germany
Submission date: 2020-11-30
Final revision date: 2021-03-03
Acceptance date: 2021-03-05
Online publication date: 2021-06-10
In order to improve the accuracy of machine tools, the use of additional active modules meeting the requirements of the “Plug & Produce” approach is focused. In this context one approach is the installation of a high precision positioning table for online compensation of machine tool deflections. For the model-based determination of the deflection, the knowledge of the effecting process force is crucial. This article examines the use of displacement sensors for force estimation in a piezoelectric system. The method is implemented on a high precision positioning table applicable in milling machine tools. In order to compensate nonlinear effects of piezoelectric actuators, a hysteresis operator is implemented. Experimental investigations are carried out to quantify the influence of preload stiffness, preload force and workpiece weight. Finally, a resolution d ≤ 78 N could be achieved and further improvements to meet the requirements for online compensation of machine tool deflection are discussed.
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