Simulation Analysis And Experimental Study On Temperature Field Of Cast-rolling And Thermal Deformation Of Roller Shell

Cast-rolling technology is regarded as one of the most developing technology in the metallurgical field of the 21 st century because of short process,low energy consumption and less investment.Therefore,cast-rolling technology is favored by enterprises,colleges and universities nowadays.But,in the process of the cast-rolling,the roll works in a complex condition with alternating cast-rolling force and temperature.Alternating change of temperature is the main reason for the failure of the roll shell.Moreover,the failure of the roll shell has a great influence on the life-span of the roll and the side dam.Thus,the production is hindered,the quality of the product is low,the safety cannot be guaranteed.subsequently the application of the cast-rolling technology is limited.Roll shell directly contact with metal melt.The molten metal fluid is cooled and then rolled by rolls.The speed of the roll,and the temperature of the molten pool are two of main process parameters affecting the temperature of the castrolling and the heat distortion of the roll.In this paper,the effects of different roll speeds and different heat source contact temperatures on the temperature field and the thermal deformation of the roll speed are discussed.A cast-rolling experiment platform is designed and built in this paper.The experiment schemes are designed.Auxiliary experimental equipment and testing instruments are also designed and manufactured in order to carry out the cast-rolling temperature field test experimental work.In accordance with experimental data,the simulation model is modified in conjunction with the simulation software.Two kinds of simulation model are established corresponding to experimental system.Temperature field of cast-rolling and thermal deformation of roll are analyzed respectively depending on line and surface contact with different roll speed and rolling contact temperature.A transient fluid model is established combined according to the actual cast-rolling situation while simulating.The contact temperature of different heat sources and the roll casing temperature field and its changing law are analyzed in accordance with the heat transfer theory of the cast-rolling process.In the static simulation analysis,the temperature field value of the transient fluid model was applied to the static model to obtain the cloud diagram of the hot deformation of the roll shell with different roll speed and different contact temperature.The circumference temperature distribution curves of the roll shell with different heat source contact temperature and different roll speed was drawn.Furthermore,the heat source contact temperature and roll speed under actual production condition are simulated.The variation trend of the circumferential temperature field curve of the roll is compared,analyzed and summarized.The results show that the temperature in the cast-rolling area decreases slightly with the increase of the rotating speed of the casting roll,but the temperature difference on the outer surface of the casting roll shell decreases obviously,and the temperature gradient of the casting roll shell decreases obviously.The higher the heat source temperature in the cast-rolling area,the greater the circumferential temperature of the roll and the amplitude of overall temperature field.The greater the temperature difference on the outer surface of the roll shell,the greater the thermal deformation of the roll shell.There are bad effect on the life of the casting roll shell and the side sealing plate and the quality of the casting and rolling products.The results of the study are helpful to the rational setting of the technological parameters of the cast-rolling process and provide some reference for the theoretical research of the casting and rolling process.