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Anticipation des déformations lors du traitement thermique de pignons de boîtes de vitesses

Abstract : Two main strategies exist to manufacture gears, depending the respective order of finishing and heat treatment. Renault mainly uses a process where heat treatment follows finishing. Due to this, gear tooth distortion can not be corrected after quenching and thus has to be analysed in detail. Regardless of these two strategies, production development can be divided in two phases : process set up and series production. Each phase has its own problem. For the first, it will be useful to know beforehand the distortion during heat treament and other steps. We present some current phenomenological models of heat treatment process. A list of input parameters is done. Next, the use of numerical simulation is examined. A good qualitative correlation is observed between numerical and experimental results. Nevertheless, due to the complexity of input data and the determination of boundary conditions, another methodology is proposed structured around a data base containing the deformations of all gears manufactured in the factories. This methodology is implemented in a software and used at all Renault locations. Once this set up is finished, the part enters into series production. A second problem occurs : the nominal process deviation. For example, slight material changes, variations in machining conditions, modifications of heat treatment and so on can be responsible for these deviations. We mainly focuse here on dimensional deviations but this method could be applied to other ones. When production is stopped, these deviations have to be rapidly identified. This is why we propose here the methodology fundamentals to recognise the deviation origin from the part deformation. A numerical basis of all the deviations is created by applying a Proper Orthogonal Decomposition on numerical simulations. The projection of the real part deformation on this basis can help us to identify the deviation origin and so reduce time needed to analyse the problem.
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https://pastel.archives-ouvertes.fr/pastel-00004771
Contributor : Ecole Mines Paristech <>
Submitted on : Friday, March 6, 2009 - 8:00:00 AM
Last modification on : Thursday, April 9, 2020 - 5:08:06 PM
Document(s) archivé(s) le : Friday, September 10, 2010 - 1:24:18 PM

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  • HAL Id : pastel-00004771, version 1

Citation

Laurent Vanoverberghe. Anticipation des déformations lors du traitement thermique de pignons de boîtes de vitesses. Sciences de l'ingénieur [physics]. École Nationale Supérieure des Mines de Paris, 2008. Français. ⟨NNT : 2008ENMP1586⟩. ⟨pastel-00004771⟩

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