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Etude quantitative de l’effet des paramètres opératoires sur le chargement thermomécanique et l’intégrité de surface en fraisage de finition du Ti-6Al-4V

Abstract : Aircraft structures, such as propulsion systems, are usually composed of metallic parts designed to tolerate high thermomechanical loads. These parts are obtained from blanks, which are then machined to final dimensions before being assembled. The machining process is thus a key step in the manufacturing cycle that must guarantee both dimensional requirements and mechanical properties. In other words, it is essential to be able to ensure that the machined surface has all the characteristics, particularly the stress and metallurgical state, which will enable it to achieve its function over a predefined period according to its dimensions. Moreover, the evolution of production techniques and facilities, intended to increase the productivity and reliability of the process, leads to frequent modifications of the manufacturing process. It is therefore necessary, although sometimes difficult, to guarantee the quality and performance of the parts produced while taking into account these updates in the manufacturing process. The interest of the surface integrity then takes all its sense on the aeronautical parts highly stressed under cyclic loadings. Indeed, the fatigue life is directly and strongly influenced by several characteristic of the surface integrity such as the surface topography, the residual stresses state and the metallurgical quality. The objective of the present work is to analyze the machining parameters of the finish milling operation of the Ti-6Al-4V titanium alloy, with the aim of making the inverse link between the surface integrity and the manufacturing process parameters. This research is structured around the concept of Process Signature, whose approach consists in quantifying the thermal and mechanical load applied to the machined surface according to the process parameters. From these loadings, a thermomechanical modeling allows to define the temperature and displacement fields of the generated surface. Experimental tests are then carried out to establish the link between the thermomechanical loading case and the integrity of the surface obtained (residual stresses, microstructure, surface topography). This is the main purpose of the Process Signature concept, which links the loading case to the surface integrity. Once this link is established, it is then possible to develop an inverse model capable of predicting the effect of the milling process and its process parameters on the surface integrity obtained.
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Submitted on : Friday, July 22, 2022 - 3:48:12 PM
Last modification on : Friday, August 5, 2022 - 2:54:00 PM

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  • HAL Id : tel-03736599, version 1

Citation

Ivan Hamm. Etude quantitative de l’effet des paramètres opératoires sur le chargement thermomécanique et l’intégrité de surface en fraisage de finition du Ti-6Al-4V. Génie mécanique [physics.class-ph]. HESAM Université, 2022. Français. ⟨NNT : 2022HESAE043⟩. ⟨tel-03736599⟩

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