Simplified roll-temperature model: spray-cooling and stress effects

Abstract

A simple model is derived for cyclic temperature transients within hot-rolling work mills. The model takes into account variable convective cooling. It is far less demanding in calculation time than, say, models based on finite-difference methods, and yet is sufficiently flexible to be applied to a wide range of techniques such as spray cooling, spray geometry, and roll-heating phenomena. It can also be used to study temperature transients during both start up from, say, a cold-roll condition, and steady-state cyclic phenomena. The model can be used to estimate cyclic stress-strain effects near the roll surface which are expected to play an important part in determining roll life and wear. It can be used as part of a larger design suite or for on-line calculations.