NUMERICAL ANALYSIS FOR TEMPERATURE FIELD AND THERMAL STRESS OF SIDE DAM WITH COMPOSITE STRUCTURE ON TWIN ROLL STRIP CASTING

摘要

To prevent rupture phenomenon of the side dam (SD) in twin roll strip casting progress, the heat insulation layer (HIL) with low coefficient of thermal conductivity (CTC) was installed on the outer surface of SD. The influence of thickness and CTC of the HIL, CTC and preheating temperature of SD was analyzed by ANSYS. The results show that the thermal stress of SD without HIL acutely varies at the initial stage of casting. The curves of thermal stress can make slow variation and the thermal stress can be drastically reduced by the HIL. The thermal stress of SD reduced with the decreased of the CTC of SD in the range of 13.8 to 25.1 W·m~(-1)·K~(-1), following a cubic curve rule. The thermal stress was decrease with increasing the CTC of side dam, following the rules of parabolic and cubic curve.