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Analytical Prediction of Part Dynamics for Machining Stability Analysis


Salih Alan*, Erhan Budak**, and H. Nevzat Özgüven*


*Department of Mechanical Engineering, Middle East Technical University, 06531 Ankara, Turkey
**Faculty of Engineering and Natural Sciences, Sabanci University, Orhanli, Tuzla, 34956 Istanbul, Turkey


Received: December 18, 2009

Accepted: January 21, 2010


Keywords: chatter stability, part dynamics, structural modification

Journal ref: International Journal of Automation Technology, Vol.4, No.3 pp. 259-267, 2010

Abstract



An analytical procedure is developed to predict workpiece dynamics in a complete machining cycle in order to obtain frequency response functions (FRF), which are needed in chatter stability analyses. For this purpose, a structural modification method that is an efficient tool for updating FRFs is used. The mass removed by machining is considered to be a structural modification in order to determine the FRFs at different stages of the process. The method is implemented in a computer code and demonstrated on different geometries. The predictions are compared and verified by FEA. Predicted FRFs are used in chatter stability analyses, and the effect of part dynamics on stability is studied. Different cutting strategies are compared for increased chatter-free material removal rates considering part dynamics.
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