The 3-dimensional flow and temperature field as well as turbulent flow models were established to simulate the liquid metal onflow of outer shell high speed steel during filling and liquid-solid bonding of roll core and shell metal based on the practical experimental data

observing the effects of pre-heating temperature of roll core on solidification and liquid-solid bonding. The results show that the molten high speed steel is progressively solidified from underside and two-side interfaces to upper and midst in the mold

however

the solidification characteristics are different with the preheating temperature variation of roll core. With lower pre-heating temperature

the end-solidification position lies in the middle of shell metal while it lies in the interface of shell metal and roll core with the higher preheating temperature at the same sections. The shell can tightly bond with the core to form the compound roll with proper preheating temperature

however

the metallurgical bonding can not be found with the lower preheating temperature for the core. The optimized preheating temperature of the core is about 1 100

1

200 ℃.