Contribution à l'étude expérimentale et à la modélisation de l'usinage des matériaux difficiles pour le procéde de forage profond avec système BTA

Abstract : Deep drilling (Drilling distance >= 5 x Øtool) with BTA system (Boring Trepanning Association) occurs when you produce parts with good productive performance combined with good machining quality. Mechanical industries operate in a context of constant competition, with ever greater technical and economic requirements. This study illustrates the desire of many industrial players (AREVA and CIRTES) and university (LEMTA, Université de Lorraine), to advance in the understanding of machining mechanisms that govern this process. A literature review revealed that this technology offers a vast and relatively unexplored field of investigation and study. The aim of this study is to analyze and modelling the phenomena which occurring in a deep drilling operation. An analysis of the morphology of the chips has introduced a new parameter for assessing the mechanical stresses suffered by the material being machined . The proposed approach allows to define the mechanical stress torsor by integrating the real cutting geometry, for all cut surfaces of active drilling head BTA. The principles of modeling used allow a relatively easy application to many materials and from the identification of a minimum parameters. Original experimental methods have allowed the identification of parameters and adjust and examine the validity of modeling. The limitations of the law of behavior have been used in evidence, and the prospects for further studies have been proposed. Nevertheless, all the results of this study open, modestly, interesting perspectives, especially in the field of helping for the choice of optimum cutting parameters, and help in the understanding of the physical phenomena of the cut
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Julien Thil. Contribution à l'étude expérimentale et à la modélisation de l'usinage des matériaux difficiles pour le procéde de forage profond avec système BTA. Autre. Université de Lorraine, 2013. Français. ⟨NNT : 2013LORR0211⟩. ⟨tel-01750511⟩

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