Prediction of milling-induced vibrations in machining complex parts : numerical and experimental investigation
Communication sans acte
Avoiding vibrations during machining is an important issue for industry. When dealing with chatter prediction with a numerical approach, several models are required: dynamical models of the workpiece and tool, cutting interaction law and surface representation. The resulting model is a trade-off between the complexity of the above-mentioned ingredients in the context of given solution strategy of equations of motion. Classically, one or two of the above mentioned modeling triad are kept rather rudimentary. These simplifications are often justified depending on the relative importance of phenomena at stake in concrete system. Nevertheless, there are cases when neglecting one of these aspects can lead to considerable alteration in the results (dynamical behavior and resulting machined surface). In the present work, an integrated approach is proposed in order to combine the use of relatively advanced developments along each modeling aspect: a reduced finite element model (using a basis of modes) of the part and tool for the dynamics, segment-wise analytical cutting laws on discretized matter-erasing cutting edges for tool/workpiece interaction, and at last dexel-based geometrical model for the surface evolution. The present work is concerned with a face milling operation of an automobile exhaust manifold. Due to the complexity of the geometry of machined surface, this operation takes place under continuously varying conditions in terms of length of tooth path, of number of engaged teeth and of local workpiece dynamic stiffness. Observations of final surface on actual parts include several zones with considerable vibration-induced defects. Different levels of detail, such as workpiece or tool compliance and damping, are applied in order to appreciate their impacts. The results show that only when flexibility of the part and of the tool are accounted for, the surface defects are close to the reality.
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Communication avec acteGERASIMENKO, Artem; GUSKOV, Mikhail; LORONG, Philippe; DUCHEMIN, Jérôme; GOUSKOV, Alexander (2016)Chatter prediction is nowadays frequently carried out for machining operations involving deformable parts or tools. These analyses are commonly based on the uncoupled elements of the system: frequency response of the ...
Communication avec acteGERASIMENKO, Artem; GUSKOV, Mikhail; DUCHEMIN, Jérôme; LORONG, Philippe; GOUSKOV, Alexander (ELSEVIER, 2015)Thin tubular parts are often subject to turning process during manufacturing. The increasing compliance of the workpiece, which is associated to tool displacement and to matter removal, can give rise to chatter, leading ...
Communication sans acteCOFFIGNAL, Gérard; DUCHEMIN, Jérôme; ILLOUL, Lounès; GENGEMBRE, Christophe; GUSKOV, Mikhail; LORONG, Philippe (2013)Présentation concernant la modélisation des phénomènes dynamiques en usinage. Cette modélisation a pour particularité de permettre la prédiction de la géométrie des surfaces usinées (défauts de forme, d'ondulation) que la ...
Communication avec acteKONDRATENKO, Kirill; GOUSKOV, Alexander; GUSKOV, Mikhail; LORONG, Philippe; PANOVKO, Grigory (Springer International Publishing Switzerland, 2015)Cutting forces measurement is an important component of the ma- chining processes development and control. The use of conventional direct meas- urement systems is often impossible as they interfere in the process’s dynamics. ...
Analytical modeling of a thin-walled cylindrical workpiece during the turning process. Stability analysis of a cutting process Article dans une revue avec comité de lectureGERASIMENKO, Artem; GUSKOV, Mikhail; GOUSKOV, Alexander; LORONG, Philippe; SHOKHIN, Alexander (Inderscience, 2017)The purpose of this work is to develop a mathematical model of the dynamics of turning a thin-walled cylindrical shell. This model uses a finite number of degrees of freedom and takes into account the variability of dynamic ...