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Contributions expérimentales et numériques pour la compréhension de l’intégrité des surfaces induite par un outil combiné usinage – galetage

Abstract : The Combined Turning-Burnishing (CoTuB) process is an innovative machining treatment that performs turning and ball-burnishing processes simultaneously and on the same machine tool. The aim of performing the combined process is to enhance surface integrity and increase productivity at the same time when compare to conventional surface treatment and machining processes. Based on adopting design of experiments, it has been depicted that a considerable improvement in surface quality could be obtained meaning the new combined process by using the suitable process parameters. In order to carry out a parametric study, a set of experiments based on Taguchi method completed with a statistical analysis of variance (ANOVA) were performed. The aim of this experimental investigation is to identify the optimal turning/burnishing parameters when treating AISI 4140 steel. This helps to get an optimal surface integrity. For a better understanding of the phenomena involved during combined machining / burnishing processes, numerical approaches and methodologies for reproducing the combined turning-burnishing process have been performed. A new approach, called the "Mixed Approach", is developed and used in order to simplify the simulation of the combined process. This approach combines experimental and numerical data in order to determine shape and to quantify thermal and mechanical loadings exerted by the cutting tool on the machined surface on each shear zone. This new method allowed to perform a 3D simulation of combined turning-burnishing and allows to model several tool passages on the machined surface. The simulation allows to predict residual stresses induced by the combined process and the comparison reveals good agreements between numerical and experimental results.
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Submitted on : Thursday, March 29, 2018 - 6:46:07 PM
Last modification on : Wednesday, November 20, 2019 - 2:26:52 AM

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Anis Rami. Contributions expérimentales et numériques pour la compréhension de l’intégrité des surfaces induite par un outil combiné usinage – galetage. Autre. Université de Lyon, 2017. Français. ⟨NNT : 2017LYSEE004⟩. ⟨tel-01753904⟩

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