Residual stress simulation for bimetallic sleeve roll constructed by shrink-fitting in comparison with bimetallic solid roll

Abstract

Next-generation rolls such as super-cermet rolls can be manufactured only by adopting a sleeve roll structure where the shaft is shrink-fitted into the sleeve. To prevent sleeve cracking due to sleeve slip, reducing the residual stress at the inner surface of the sleeve is important. In this paper, therefore, two extreme manufacturing processes are investigated to provide suitable residual stress to the sleeve; one is the process of quenching/tempering a solid roll and boring the inside to manufacture a sleeve. The other is the process in which the inside of a solid roll is lathed to manufacture a sleeve, which is then quenched/tempered. The results show that the latter sleeve heat treatment is better than the former solid heat treatment because the tensile residual stress can be reduced at the sleeve inside. After shrink-fitting of the shaft into the latter sleeve, the fatigue strength and the residual stress are discussed in comparison with the ones of the solid roll currently and widely used.