The Research on Regularity of Residual Stress Distribution of Engine Crankshaft Fillet Rolling

The paper sets up the Finite Element Model on the basis of crankshaft fillet rolling experiment and its mechanism. And then the paper shows the distribution of the residual stress in different depths of rolled crankshaft fillet through numerical simulation. It is found that the fatigue strength can greatly be produced by the method of the engine crankshaft fillet rolling in most of fillet areas; Simultaneously, two strips of tensile stress which is related to reduce the crankshaft fatigue strength will be generated in the peripheries. The tensile stress strips only emerge in the surface layer of the fillet, and then mainly disappear in the depths of 0.4mm below the surface layer. The paper concludes that the main reason of strips of tensile stress lies on the transition between the deformed region and the non-deformed reformed region after trolley wheel pressure is imposed on through a further research.