Cast-rolling force model in solid-liquid cast-rolling bonding (SLCRB) process for fabricating bimetal clad strips
(1. National Engineering Research Center for Equipment and Technology of Cold Strip Rolling, Yanshan University, Qinhuangdao 066004, China;
2. College of Mechanical Engineering, Yanshan University, Qinhuangdao 066004, China)
2. College of Mechanical Engineering, Yanshan University, Qinhuangdao 066004, China)
Abstract: Based on twin-roll casting, a cast-rolling force model was proposed to predict the rolling force in the bimetal solid-liquid cast-rolling bonding (SLCRB) process. The solid-liquid bonding zone was assumed to be below the kiss point (KP). The deformation resistance of the liquid zone was ignored. Then, the calculation model was derived. A 2D thermal-flow coupled simulation was established to provide a basis for the parameters in the model, and then the rolling forces of the Cu/Al clad strip at different rolling speeds were calculated. Meanwhile, through measurement experiments, the accuracy of the model was verified. The influence of the rolling speed, the substrate strip thickness, and the material on the rolling force was obtained. The results indicate that the rolling force decreases with the increase of the rolling speed and increases with the increase of the thickness and thermal conductivity of the substrate strip. The rolling force is closely related to the KP height. Therefore, the formulation of reasonable process parameters to control the KP height is of great significance to the stability of cast-rolling forming.
Key words: bimetal clad strip; solid-liquid cast-rolling bonding; rolling force calculation model; kiss point; thermal-flow coupled simulation