Verenev Valentin Vladimirovich, Dr.Sci. (Engin.), Senior Research Scientist, Iron and Steel Institute named after Z.I. Nekrasovof the NAS of Ukraine, Academican Starodubova square, 1, Dnipro, Ukraine, 49107; e-mail:verenev0704@gmail.com, ORCID 0000-0002-2561-5365
Podobedov Nikolai Ivanovich, PhD (Engin.), Senior Research Scientist, Iron and Steel Institute named after Z.I. Nekrasov of the NAS of Ukraine, Academican Starodubova square, 1, Dnipro, Ukraine, 49107

Self-regulation during continuous rolling in broadband mills

Abstract. 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 sixyielding 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 selfregulation should be considered when managing the process of continuous
rolling.
Keywords: continuous rolling, strip, thickness deviation, tension, selfregulation time
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