Développement d'un modèle d'efforts de coupe intégrant le contact en dépouille : application au tournage de superfinition du cuivre Cu-c2

Abstract : The aim of this work is the modelling of cutting forces in superfinish machining of copper Cu-OFHC through the Tool-Edge-Pair method. The cutting force prediction allows to adapt machining conditions and tool geometries to improve their performance. This method is based on edge segmentation and elemental forces functions of cutting parameters applied on each segment. The link between the edge geometry and the cutting parameters is made by the force model. The sum of these elemental forces leads to the main forces acting on the tool. This study aims to compute these forces from three models. The first two models are based on phenomenological relations dependant on cutting parameters as chip thickness, tool geometry and edge quality. The third model is analytical and based on the three zones scheme assumed in chip formation mechanics. The primary shear zone is characterised by a Norton-Hoff constitutive law. The second and third zones, respectively at the tool-chip interface and on the clearance face are characterised by a stress distribution. The performances of these models are compared using the Tool-Edge-Pair method. The experimental data are obtained from images taken during the machining process and from force measurements. Orthogonal cutting tests were conducted on disc and tube samples to isolate the effect of the workpiece diameter on the contact along the clearance face of the tool.
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Submitted on : Friday, January 20, 2012 - 1:55:44 PM
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Dimitri Germain. Développement d'un modèle d'efforts de coupe intégrant le contact en dépouille : application au tournage de superfinition du cuivre Cu-c2. Génie mécanique [physics.class-ph]. Arts et Métiers ParisTech, 2011. Français. ⟨NNT : 2011ENAM0048⟩. ⟨pastel-00661684⟩

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