A general method to accurately simulate material removal in virtual machining of flexible workpieces
Rapport de recherche
Date
2015Résumé
Multi-axis milling and other computer numerical control machining processes allow us to create very complex geometries and thin parts. In this context, virtual machining is a powerful tool, but the simultaneous vibrations of the tool and workpiece are not easy to define and take into account. This paper presents a general method with which to simulate material removal when both the workpiece and tool are assumed to be non-rigid. We consider that they both vibrate when we define the Boolean chip. This is not usually considered with the aim of predicting the machined surface vibrations and the resulting geometric defects including roughness. By extending the material frame associated with the non-rigid workpiece, our method precisely defines the material removal for any tool or workpiece. It then allows us to establish a method of deriving efficient numerical approximations with which to simulate a succession of machining operations from roughening to finishing. Two kinds of finite element approximations are linked. One is a classical elastic finite element model including damping. The second, which is kinematically linked to the first, accurately describes the relative motion of each part of the tool with respect to the workpiece, and ensures the description of material removal and related forces. Two industrial examples show the potential of the method.
Fichier(s) constituant cette publication
- Nom:
- PIMM_Int_Repport_Lorong_2015.pdf
- Taille:
- 4.344Mo
- Format:
- Description:
- Internal Report
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Documents liés
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Communication sans acteCOFFIGNAL, Gérard; DUCHEMIN, Jérôme; ILLOUL, Lounès; GENGEMBRE, Christophe; LORONG, Philippe; GUSKOV, Mikhail (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 ...
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Article dans une revue avec comité de lecturehis paper deals with the implementation in 3D of the constrained natural element method (CNEM) in order to simulate material forming involving large strains. The CNEM is a member of the large family of mesh-free methods, ...
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Communication avec acteILLOUL, Lounès; BERTHE, Laurent; LORONG, Philippe; RANC, Nicolas; SCHNEIDER, Matthieu; FAVIER, Véronique; GIRARDOT, Jeremie (Congrès français de mécanique (21 ; 2013 ; Bordeaux (Gironde), 2013)This work presents a numerical alternative for the laser drilling simulation problem. Using finite element method is difficult to simulate the hole propagation over time, especially because of moving boundaries due to a ...
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Article dans une revue avec comité de lectureILLOUL, Lounès; LORONG, Philippe; RANC, Nicolas; SCHNEIDER, Matthieu; FAVIER, Véronique; GIRARDOT, Jeremie (Springer Verlag, 2017)The laser drilling process is the main process used in machining procedures on aeronautic engines, especially in the cooling parts. The industrial problematic is to reduce geometrical deviations of the holes and defects ...
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Communication avec acteILLOUL, Lounès; BERTHE, Laurent; LORONG, Philippe; RANC, Nicolas; SCHNEIDER, Matthieu; FAVIER, Véronique; GIRARDOT, Jeremie (2012)Ces travaux présentent une alternative numérique au problème de simulation du procédé de perçage par laser. L’utilisation des éléments finis pour modéliser la propagation du trou au cours du temps montre des limites ...