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Theses

De l'adaptation à la variation continue de la vitesse de broche afin de contrôler le broutement en fraisage de parois minces : modélisations et études expérimentales

Abstract : The work presented in this thesis fits into the context of machine tool vibration and, especially, milling of thin-walled structures, like typical structural aeronautical parts. The aim is to contribute to the control of chatter vibration at both theoretical and practical level.
Several aspects of research were identified: the extension of conventional methods using “stability lobes”, the modelling of the transient phenomena occurring at the same step of machining and, at last, the use of spindle speed variation.
Generalization of stability lobes for thin-walled parts with complex vibration behaviour requires the consideration of a third dimension which describes the parameter evolution during machining. This approach presents good improvement for the machining operation considered. However, some phases of the process are impossible to optimize and the dynamical behaviour is very difficult to be modelled in practice.
The third part focuses on the development of a relatively simple numerical model, but taking into account all aspects of the problem, considered essential for the modelling of thin walls. This model gives new interpretations of the surface roughness evolution that is often observed on the workpiece but rarely explained in detail to our knowledge.
The last part presents the development of a technique to reduce chatter vibration by spindle speed variation. This method provides significant gains in high-speed machining, especially in the area of the “flip lobe”. However, transient vibrations may appear during the machining process that reduces the effectiveness of the method.
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https://tel.archives-ouvertes.fr/tel-00374725
Contributor : Sebastien Seguy <>
Submitted on : Thursday, April 9, 2009 - 3:24:10 PM
Last modification on : Friday, May 17, 2019 - 1:59:39 PM
Long-term archiving on: : Thursday, June 10, 2010 - 8:13:04 PM

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  • HAL Id : tel-00374725, version 1

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Sébastien Seguy. De l'adaptation à la variation continue de la vitesse de broche afin de contrôler le broutement en fraisage de parois minces : modélisations et études expérimentales. Génie mécanique [physics.class-ph]. Institut National Polytechnique de Toulouse - INPT, 2008. Français. ⟨tel-00374725⟩

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