Texturation anti-friction des portées cylindriques de vilebrequins

Abstract : The recent introduction of tougher emissions standards has indirectly led the RENAULT group to tighten up and optimize specifications applied to surfaces in contact. Crankshafts journals are particularly concerned. Like product/process developments linked to the honing of cylinder liners, there have been recent plans to apply anti-friction texturing to crankshaft journals and crank pins. These bearing surfaces are currently super-finished by belt-grinding, an abrasion procedure that is both robust and economical. Unfortunately, belt-grinding produces a unique surface morphology, in the factory at least, i.e. integral circumferential striation. In this sense it appears very limited. The purpose of this study is to investigate in more detail the texturing capacities of belt-grinding. It provides a set of experimental analyses aiming to understand the textural limits observed in the factory and offer innovative solutions to significantly improve the texturing potential of the procedure. Focusing on the three-pronged Process/Texture/Functionality approach, this work is also part of a global process by looking both at laser texturing, characterization of the textured surfaces and the influence of textures on the static and dynamic function of the bearings. The results show in particular that the belt-grinding procedure is capable of robustly producing a real diversity of textures. They also show that striving to achieve a « mirror-polish » finish may be something to prioritize for crankshafts journals.
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Submitted on : Thursday, January 25, 2018 - 4:20:18 PM
Last modification on : Friday, May 10, 2019 - 3:53:09 PM
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  • HAL Id : tel-01692997, version 1

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Kevin Serpin. Texturation anti-friction des portées cylindriques de vilebrequins. Génie des procédés. Ecole nationale supérieure d'arts et métiers - ENSAM, 2017. Français. ⟨NNT : 2017ENAM0018⟩. ⟨tel-01692997⟩

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