Abstract. In the paper, a study of the influence of variable technological loads on the main line of the rolling mill is carried out. A mathematical model of the study of dynamic processes in group electric drives of crimping technological machine units (rolling mills) is presented. It is shown that the dependence of the moment of technological resistance on the speeds of the working rolls is determined by the dependence that takes into account the peculiarities of the technological load. The study of the influence of variable technological loads on the main line of the rolling mill showed that the drop in the coefficient of friction on the upper shaft is the most dangerous. It was found out that in these cases, there can be a significant mismatch of the speeds of the working rolls, and the drop in the moment of technological resistance on the upper roll is not compensated by the increase in the moment of technological resistance on the lower roll; therefore, self-oscillations are excited in the elastic links of the main line of the rolling mill, as well as unstable modes of oscillations.

Keywords: dynamic model, group machine unit, crimping mill, rolling mill.