Abstract : In machining by removal of material, for specific design of parts and under specific cutting conditions, self-excited vibrations are inevitable.
To try to cure this phenomenon in turning of materials, an original experimental study based on the concept of torque of forces is set up to determine, very precisely, the dynamic behavior of the machining system (part/tool/machine). The main parameters relating to the dynamic behavior of the machining system are identified. The localization of displacements of the point of the tool in a characteristic plan is demonstrated. The existence of this plan and the correlations with the elastic characteristics of the machining system make it possible to simplify the dynamic model 3D and to propose a model in agreement with the experimental results while remaining in a three-dimensional configuration of the cut.
The numerical simulation resulting from this simplified model provides results in perfect agreement with the experiment.