Contribution à l’identification des origines des déformations révélées au traitement thermique. Application à l’analyse d’une gamme de fabrication d’arbres à dentures de boites de vitesses.

Abstract : Heat treatment is widely used in automotive industry, especially in the case of gears. This process is habitually used after machining and increases mechanical properties of work pieces. In the meantime, several phenomena lead to distortions and sometimes to geometrical non-conformities. Distortions are due to heat treatment but also to previous manufacturing processes.The objective of this study is to improve both the understanding of physical phenomena occurring during heat treatment and the identification of distortion. First, distortions of each single manufacturing step are identified. Then, causes of final geometry amongst the overall process are ranked. A numerical manufacturing process is used as an example to illustrate this method.Secondly, residual stress influence on heat treatment distortion is revealed thanks to several industrial experiments. Thus, each single geometrical criterion is linked to a manufacturing step. These results provide a diagnosis tool helping to determine distortion causes. Moreover, evolutions on industrial process are proposed.
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Rémi Husson. Contribution à l’identification des origines des déformations révélées au traitement thermique. Application à l’analyse d’une gamme de fabrication d’arbres à dentures de boites de vitesses.. Autre. Ecole nationale supérieure d'arts et métiers - ENSAM, 2013. Français. ⟨NNT : 2013ENAM0017⟩. ⟨pastel-00907422⟩

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