Effect of Driving Torque on the Interfacial Creep for Shrink-fitted Bimetallic Work Roll

Abstract

The bimetallic work rolls are widely used in the roughing stands of hot rolling stand mills. The rolls are classified into two types; one is a single-solid type, and the other is a shrink-fitted construction type consisting of a sleeve and a shaft. Regarding a shrink-fitted construction type, the interfacial creep sometimes appears between the shaft and the shrink-fitted sleeve. This interfacial creep can be regarded as the relative displacement between the sleeve and the shaft, which often causes the roll damage. In this paper, the FEM simulation is performed to clarify the effect of driving torque on the interfacial creep by considering the driving motor torque. It is found that the relative displacement in the interfacial creep is accelerated by the presence of the motor torque significantly. With increasing the shrink fitting ratio, the relative displacement in the interfacial creep decreases. The effects of motor drive torque on the stress, the displacement and average displacement along the interface were also discussed by varying the motor torque.