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System identification during milling via active magnetic bearing

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Abstract

One of the main focuses of recent machine tool development is to increase the machining performance. But the enhancement of the metal removal rate (MRR) is often limited by the stability of the milling process. To prevent unintentional chatter vibrations and to observe changes in the system’s behavior, there is a need to observe the state of the milling process during machining. Beside others, one approach is the development of an adaptronic motor spindle using active magnetic bearings (AMB) combined with conventional roller bearings in a so called “hybrid approach”. The AMB acts as a contact less sensor and actuator, in order to estimate the frequency response function (FRF) of the spindle-tool system during the milling process. The two major dependencies on the FRF are the spindle speed and the cross-sectional area of the chip. Also the closed loop damping can be observed to estimate the stability margin. This paper presents the identification of the varying eigenvalues during the machining.

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Notes

  1. This research project is funded by the Deutsche Forschungsge-meinschaft (DFG) in line with the program SPP 1156

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Authors and Affiliations

  1. Institute of Production Management, Technology and Machine Tools, Technische Universität Darmstadt, Darmstadt, Germany

    Eberhard Abele, Andreas Schiffler & Stefan Rothenbücher

Authors
  1. Eberhard Abele
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  2. Andreas Schiffler
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  3. Stefan Rothenbücher
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Correspondence to Eberhard Abele.

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Abele, E., Schiffler, A. & Rothenbücher, S. System identification during milling via active magnetic bearing. Prod. Eng. Res. Devel. 1, 309–314 (2007). https://doi.org/10.1007/s11740-007-0022-z

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  • DOI: https://doi.org/10.1007/s11740-007-0022-z

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