Étude expérimentale, modélisation et simulation numérique de l'usinage à sec des aciers inoxydables : étude de l'effet des revêtements mono et multi-couches

Abstract : When machining metal alloys, cutting tools are subjected to intense thermomechanical loading, which can lead to a significant reduction of their lifetime. The use of coated tools is then beneficial, in particular during dry machining of stainless steels which are considered as difficult to cut materials. This phD thesis is focused on the effect of coatings addressing aspects of modeling, simulation and experimental tests using tools with complex geometries. Experimental tests under dry turning configuration were performed on an AISI 304L stainless steel with coated and uncoated tools. Particular attention was paid to the temperature evolution, cutting forces and roughness. A wide range of cutting conditions was considered for an advanced understanding of the physical phenomena involved in machining. Experimental results allowed the identification of optimum cutting conditions for the considered tool/workpiece couple and highlighted the importance of coatings in dry machining of stainless steels. In addition, a hybrid analytical/numerical modeling was developed and implemented in DEFORM code. Based on the chip flow direction, 3D forces can be deduced from a 2D numerical simulation of machining. An extraction procedure of real profiles of the tool was introduced using a 3D scanning Breuckmann system. This procedure allows taking into account the real geometry of the tool in numerical simulations. Finally, the comparison between numerical and experimental results allowed the validation of the proposed model
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Fousseny Koné. Étude expérimentale, modélisation et simulation numérique de l'usinage à sec des aciers inoxydables : étude de l'effet des revêtements mono et multi-couches. Autre. Université de Lorraine, 2012. Français. ⟨NNT : 2012LORR0155⟩. ⟨tel-01749360⟩

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