Self-regulation during continuous rolling in broadband mills

The aim of the work is the development of ideas about the regulation of the rolling process in continuous groups of stands of a wide-strip hot rolling mill. By mathematical modeling of the dynamics of the interaction of the stands during continuous rolling, taking into account torsional vibrations and transport transfer, the duration of the self-regulation time of the six-yielding group was determined. It is shown that the parameters of the rolled strip significantly affect the nature of the change in tensions and deviations of the strip thickness after each stand. During the filling of a continuous band with a strip in the mill stands, there are perturbations caused by the capture of the strip by the rolls of each stand. The task of regulatory actions at this point can increase the destabilization of the process. The thickness of the rolled strip slightly affects the self-regulation time of the continuous rolling process. In the modes of rolling and filling the group with a strip, this time was ~ 14 s from the beginning of the disturbance at the entrance to the group. The signs of perturbations and their combinations are determined by the deviation of the strip thickness and temperature, at which a short-term loss of process stability is possible due to a drop in tension in some intervals. It has been established that there are such combinations of perturbation signs in thickness and strip temperature when a group disintegrates into two unrelated ones, which leads to a violation of the stability of the tension process. The above features of self-regulation should be considered when managing the process of continuous rolling.