Abstract
Characteristics of a reverse four-high rolling stand of the plate mill 5000 of the PJSC “Magnitogorsk Iron and Steel Works” (“MMK”) are given in the article. As a result of the experiments carried out at the rolling mill, the research group confirmed a significant excess of dynamic loads of electric drives of both upper and bottom rolls during metal feeding over the set values. The research group determined the main causes of the unsatisfactory transient processes and confirmed the appropriateness of developing the ways of electric drive control, which will make it possible to reduce the loads and limit the fluctuations of torque during metal feeding. A method of electric drive control was offered to provide the decrease of excessive correction of the torque by means of preliminary setting of the gap in spindle junctions. The researchers considered the way of compensating the dynamic deviation of speed control by means of increasing the speed before the metal feeding. The comparative analysis of oscillograph records of torques and speeds confirmed the improvement of dynamic characteristics after implementation of the suggested control algorithms. The suggested method of control for electric drives of rolls and hydraulic screwdown structures provides the improvement of feeding conditions due to preliminary increase of the roll gap. The article shows oscillographs of speeds and torques for different variants of target values to change the position of screwdown structures. It was found that the target limiting of the dynamic torque cannot always be achieved. It was noted that it is necessary to carry out further investigations using mathematical modeling methods. The article offers recommendations aimed at commercial introduction of the developed technical solutions.
Keywords
Plate rolling mill, reverse stand, electric drive, dynamic load, limitation, methods, control systems, development, experimental studies, introduction, recommendations.
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