EXPERIMENTAL AND NUMERICAL ANALYSIS OF END MILLING TOOLS DYNAMIC PARAMETERS
Résumé
Chatter is a situation that must be avoided on machining due to the bad surface generated by the tool with extreme conditions of vibrations. It is possible to calculate optimal machining parameters configurations to avoid chatter, as the maximum depth of cut for a defined spindle speed that does not produce chatter in end milling processes, using dynamic models based on the dynamic behavior of the tool and its fixture to the machine-tool. Nevertheless, dynamic models need experimental data to determine dynamic parameters as stiffness, damping and natural frequency of the system. This work presents a methodology to assess tool dynamic parameters using a nonlinear numerical model based on the Finite Element Method (FEM). To calibrate the proposed model the dynamic parameters acquired experimentally are compared with the ones obtained through FEM model for an end milling process. Using the Altintas model for predicting chatter, the two sets of dynamic parameters (taken from experiments and from simulation) are computed separately and lobe diagrams for each set are constructed and compared. Results indicate that dynamic parameters obtained from FEM model can be used with literature models, as the Altintas model, to predict chatter in end milling.
Domaines
Mécanique [physics.med-ph]Origine | Fichiers produits par l'(les) auteur(s) |
---|