Study on the Residual Deflection of Large Sleeved Back-Up Rolls

Abstract

The residual deflection of large sleeved back-up rolls of a four-high cold strip-mill is dealt with in the present paper. First, effects of load sequence, shrink-fit allowance, condition at shrink-fit interface, shape of roll etc. upon the deflection as well as the mechanism of the deflection were made clear experimentally using model rolls 156 mm in diameter and 980 mm in total length. Next, residual stresses of model sleeved rolls were measured by the boring-out method. Then, with the aid of the results obtained the mechanism of the deflection was examined theoretically, and an approximate solution for the calculation of the deflection was derived. As the final stage of this study, field data on actual rolls were confirmed to which some techniques of preventing the residual deflection, found thus far in the course of basic study, had been applied.