Description du projet
Traitement laser de surface pour les cannelures couronnées
Les cannelures couronnées dans les applications de type ration à dérivation ultra-haute peuvent obtenir des qualités de surface exceptionnelles en combinant les procédés laser et physique de dépôt de vapeur. Le projet CROSSONT, financé par l’UE, élaborera des méthodes de traitement laser de surface pour les cannelures couronnées, capable de réduire le risque d’usure et le frottement au niveau des liaisons des cannelures entre l’arbre et l’engrenage. Le projet emploiera une combinaison de revêtements et de trempe laser localisée. En outre, il s’intéressera aux surfaces d’acier des engrenages texturées au laser qui constituent toujours une méthode innovante. CROSSONT utilisera un plan de test statistique pour identifier les méthodes les plus efficaces et examiner la façon de les combiner. Les méthodes seront évaluées dans un nouveau banc d’essai adossé («back-to-back») adapté aux cannelures couronnées.
Objectif
The main goal of the project CROSSONT is to provide surface treatment methods for crowned splines which are able to fulfil the requirement of reducing the risk of wear and minimizing the friction in the spline connections between shaft and gear. It is the consortium's firm conviction that outstanding surface properties for crowned splines in UHBR applications can be generated with a combination of laser and physical-vapour-deposition (PVD) processes. Modelling of the crowned spline will be conducted to predict its behaviour. In combination with the coatings, laser local hardening is to be used, and, on the other hand, laser textured gear steel surfaces are to be considered. The latter are becoming more and more important due to their tribological properties. It is mandatory that the results of the project are low in maintenance, highly reliable and allow long life time. The proposed laser based surface treatments technologies are laser local hardening, laser microstructuring and laser nanostructuring. Additionally, multi-layered coatings will be investigated in terms of PVD and in specific by reactive magnetron sputtering. These systems may be doped with silver in order to control heat balance or to introduce a wear indicator as a smart coating. The most effective methods will be identified by using a statistical test plan, which will also investigate the combination of such methods. While PVD is able to realise thin hard coatings to protect the surface from wear, the named laser processes can either reduce wear (e.g. laser hardening) and/or reduce the coefficient of friction (e.g. micro-/nanotextures). In general, laser local hardening can be considered as an almost established process, while laser texturing is still an innovative approach to further improve the surface properties of crowned splines. The most promising methods will be applied to full scale splines and evaluated in dynamic fatigue testing. The findings are summarized in a technical recommendation.
Champ scientifique
Programme(s)
Régime de financement
RIA - Research and Innovation actionCoordinateur
52062 Aachen
Allemagne