Dynamics and stability of milling process

Numerical and experimental investigations conducted into the dynamics and stability of a range of milling operations are presented in this article. A uni®ed mechanics based model developed to study workpiece±tool system dynamics is used for the numerical studies. This model, which allows for both regenerative e€ects and loss of contact e€ects, can be used for studying partial-immersion, high-immersion, and slotting operations. Loss of stability of periodic motions associated with milling operations is assessed by using Poincar e sections, and the numerical predictions of stable and unstable motions are found to compare well with corresponding experimental data. Bifurcations experienced by the periodic motions with respect to parameters such as axial depth of cut are numerically examined and discussed. The sensitivity of dynamics to tooth passing period, feed rate, and feed direction is also discussed