Modal Analysis and Experimental Plan of Thin-Walled Workpieces in Turning Cutting Process

In a machining process, self excited vibrations (chatter) take an important place in many research works. In classic cases, with a massive workpieces, chatter vibrations occur when the depth of cut or the cutting speed exceeds the stability of machine tool. But with a thin wall workpiece, the situation of chatter vibration problems is not so simple. Thus, the main object of our study is to qualify the dynamic behaviour of a thin walled workpieces during a turning cutting process. In this part of our study, we will present some results of a modal analysis, calculated with a finite element program on tubular workpieces with different materials (steel, aluminium and titanium alloys) and with several geometry and setting parameters. The mode frequencies are then analyzed with Yats factorial experimental plan (3
³
) to define and make in evidence the main controlled design factors.