Fatigue strength analysis of bimetallic sleeve roll by simulation of local slip accumulation at shrink-fit interface caused by roll rotation.

Next generation rolls such as super-cermet rolls and all-ceramic rolls can be only manufactured as sleeve rolls, although the circumferential slippage appears at the shrink-fit interface. In this study, the fatigue strength of the sleeve roll is evaluated by applying the load shifting method on the fixed roll to realize the local slip accumulation during roll rotation. The simulation shows that the fatigue-inducing stress amplitude remains constant although the accumulated slip amount increases. Based on those results, the fatigue strength of standard rolling rolls is estimated considering the slip defect. The defect dimension can be characterized by the root area parameter and the value area =1254 μ m can be estimated from smaller roll experimental results and the previous report for larger diameter sleeve rolls. The results show that in the absence of slip damage, the fatigue strength of sleeve rolls is not much lower than that of solid rolls without shrink-fit. [ABSTRACT FROM AUTHOR]