Generation Mechanism of Driving Out Force of the Shaft from the Shrink Fitted Ceramic Roll by Newly Designed Stopper and the Coming out Process

Abstract

Ceramic roller can be used in the heating furnace conveniently because of its high temperature resistance. The roller consists of ceramic sleeve and steel shaft connected only under a small shrink fitting ratio because of the brittleness. However, the coming out of the shaft sometimes happens from the ceramic sleeve under repeated load. Therefore, it is important to find out the driving out force generation mechanism to prevent the coming out failure. Based on the previous studies, a two-dimensional shrink fitted structure is considered by replacing the shaft with the inner plate and by replacing the sleeve with the outer plate. Then, this research focuses on calculating the driving out force generated on the inner plate by introducing a newly designed stopper on the outer plate. The finite element simulation shows that the coming out phenomenon can be prevented due to the contact between the inner plate and the stopper installed on the outer plate. Then the mechanism of driving out force generation is clarified. Finally, the process of coming out in terms of the residual displacement is illuminated.