Analytical Prediction of Part Dynamics for Machining Stability Analysis

An analytical procedure is developed to predict work-piece dynamics in a complete machining cycle in order to obtain frequency response functions (FRF), which are needed in chatter stability analyses. For this pur-pose, a structural modification method that is an efficient tool for updating FRFs is used. The mass re-moved 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 ge-ometries. 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. © Fuji Technology Press Ltd.