Etude des vibrations auto-entretenues en coupe tridimensionnelle : nouvelle modélisation appliquée au tournage

Dans la mise en forme par enlevement de matiere, pour certaines morphologies de pieces et sous certaines conditions de coupe, l'apparition de vibrations auto-entretenues est inevitable. Pour remedier a ce phenomene en tournage des materiaux, une etude experimentale originale exploitant la notion de torseur d'efforts est mise en place pour determiner, tres precisement, le comportement dynamique du systeme usinant (piece/outil/machine). Les principaux parametres relatifs au comportement dynamique du systeme usinant sont identifies. La localisation des deplacements de la pointe de l'outil dans un plan caracteristique est demontree. L'existence de ce plan et les correlations avec les caracteristiques elastiques du systeme usinant permettent de simplifier le modele dynamique 3D et de proposer un modele en accord avec les resultats experimentaux tout en restant dans une configuration tridimensionnelle de la coupe. La simulation numerique issue de ce modele simplifie fournit des resultats en bon accord avec l'experience.

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