Modèle dynamique d'électrobroche en rotation et prédiction de la stabilité de la coupe

Abstract

Prediction of stable cutting conditions is a critical requirement for high-speed milling operations. In this paper, a high-speed spindle-bearing system dynamic model is elaborated on the basis of rotor dynamics prediction. It is shown that dynamic behaviour dependencies on the rotation speed range have to be taken into account for accurate stability prediction. By integrating the proposed speed dependent spindle transfer function in the chatter vibration stability approach of Altintas and Budak, a dynamic stability lobes diagram is predicted. The proposed method allows establishing a new stability lobes diagram that takes into account the dependency of dynamic behaviour on spindle speed. Significant changes are observed on the stability limits, constructed using the model, and allow accurate prediction of cutting conditions to be done. Finally, experiments are performed in order to validate the chatter boundaries prediction in practice.