NONLINEAR DYNAMICS OF MILLING PROCESS
Résumé
The cutting processes include different manufacturing procedures as milling, turning and drilling. In all of these, the machine tool vibration plays an important role concerning the cutting characteristics. Therefore, its correct understanding is essential in order to improve the workpiece surface quality and avoid tool breakage. Chatter and squeal are some undesirable phenomena related to an improper functioning. This article discusses the nonlinear dynamics associated with the machine tool vibration relative to the workpiece considering a nonsmooth single-degree of freedom system. Milling process is of concern assuming different machining characteristics. The cutting force depends not only on the current position of the tool and the workpiece but also on a delayed value of the displacement as it is a function of the chip thickness. Therefore, the equation of motion is represented by a delay-differential equation that is solved employing the Runge-Kutta method together with a Taylor's series approximation employed to estimate the difference terms. Numerical simulations are carried out showing some situations related to proper and improper functioning during the cutting process.
Domaines
Mécanique [physics.med-ph]
Origine : Fichiers produits par l'(les) auteur(s)