Experimental and Numerical Investigation of the Vibration Characteristics in a Hot Plate Rolling Mill Based on Multibody Dynamics

Analysis of chatter vibration characteristics is an important factor that determines the quality of the slab in a rolling process. A numerical model is proposed to investigate the vibration characteristics. A hot plate rolling mill that includes the driving system is modeled by multibody dynamics to investigate the cause and characteristics of the chatter vibration. Since the spindle of a thick plate hot rolling mill is inclined within 2 degrees depending on the connection part, it is necessary to take into account the elastic effect of the spindle deflection. Therefore, the rigid body model of the previously studied method and the flexible body model that can consider the elastic effect were compared with the experimental model and the accuracy was verified. The chatter frequency was analyzed according to the rolling process and compared with the theoretical calculation results to investigate what occurred during the rolling process. The chatter frequency was compared with the natural vibration frequency of the spindle connected to the work roll and could be expected to be directly related to the bending vibration.