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Modeling the orientation-dependent dynamics of machine tools with gimbal heads

: Law, Mohit; Grossi, N.; Scippa, A.; Phani, A.S.; Altintas, Yusuf

Neugebauer, Reimund; Drossel, Welf-Guntram ; Fraunhofer-Institut für Werkzeugmaschinen und Umformtechnik -IWU-, Chemnitz:
Innovations of sustainable production for green mobility. Energy-efficient technologies in production. Pt.1 : 3rd International Chemnitz Manufacturing Colloquium, ICMC 2014; 3rd International Colloquium of the Cluster of Excellence, eniPROD; Proceedings
Zwickau: Verlag Wissenschaftliche Scripten, 2014 (Berichte aus dem IWU 80)
ISBN: 978-3-95735-004-6 (Pt.1)
ISBN: 978-3-95735-005-3 (Pt.2)
International Chemnitz Manufacturing Colloquium (ICMC) <3, 2014, Chemnitz>
International Colloquium of the Cluster of Excellence (eniPROD) <3, 2014, Chemnitz>
Fraunhofer IWU ()
machine tool; dynamics; stability

Machine tools with gimbal heads continuously rotate and/or pivot their spindle heads to maintain the required relationship between the tool and the surface being cut. This results in orientation-dependent dynamic behavior at the tool-center-point, which further results in orientation-dependent machining stability of the system, potentially limiting productivity during continuous cutting. A dynamic substructuring procedure is proposed to model this behavior by orienting machine tool substructures to their proper configuration prior to synthesis to obtain the synthesized orientation-dependent response. Influence of the changing dynamics on chatter stability is further investigated; and, a strong dependence of machining stability on orientation is observed.