Etude des copeaux et de l'intégrité de surface en usinage à grande vitesse de l'alliage de titane TA6V

Abstract : High speed machining (HSM) is a metal forming process very appreciated in industry because of the advantages that it provides, in comparison with traditional machining. In this work, orthogonal cutting tests were carried out on titanium alloy TA6V in order to study the chips and the machined surfaces. The morphology and the metallurgy of the chips obtained were characterised. Main results obtained by using materials characterisation techniques (XRD, SEM, EDX, EBDS) were used to comment on the nature of the shear bands. It leads to priviligeate the catratrophic shear theory in order to explain the chips formation process in HSM. Surface integrity is the term used to describe the parameters related to the micro-geometrical and the structural characterisation of a machined surface. This study leads to estimate the impact of the process on the obtained component. The surface integrity was studied with two different approach: firstly the characterisation of the crystallographic texture of surfaces and its evolution with the cutting speed was carried out. For this propose, a new strategy of data measurement and treatment in order to separate and to fit the X-ray diffraction peaks was developed. Secondly part, a metallurgical approach to characterise the machined surfaces was used. The morphology of material beneath the machined surface and their residual stress was also determined. It was possible to show the machined surface is a bi-layer material. Finally, the residual stresses and the crystallographic texture of the machined surfaces were correlated with the microstructural observations of the machined surfaces and the obtained chips
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Juan David Puerta Velasquez. Etude des copeaux et de l'intégrité de surface en usinage à grande vitesse de l'alliage de titane TA6V. Autre. Université Paul Verlaine - Metz, 2007. Français. ⟨NNT : 2007METZ005S⟩. ⟨tel-01775461⟩

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