Decrease in the dynamic moment in the main line of a rolling stand of a plate mill

On the example of electromechanical systems of a plate mill 5000, the problem of reducing dynamic loads in the shaft ducts of the stand during the capture of metal by rolls is considered. It is noted that the amplitude of the dynamic moment largely depends on the ratio of the speed of the metal along the roller table and the linear speed of the rolls of the reversing stand. The mechanism of occurrence of shock loads when closing the angular gap in spindle joints is considered. Experimental confirmation of the oscillatory nature of the moments during capture is given. A method of limiting dynamic loads due to the preliminary acceleration of the electric drive before the capture and its subsequent braking with a given negative acceleration is considered. It is noted that the disadvantage of this method is the dependence of dynamic loads on the accuracy of determining the position of the “head” of the roll relative to the stand. An improved method for controlling the speed of metal along the rolling table is proposed, which ensures the invariance of dynamic processes to the accuracy of determining the position of the metal. Tachograms of the stand electric drive are considered, explaining the essence of the developed method. The results of mathematical modeling and experimental studies performed on the mill 5000 are presented. The effectiveness of the proposed technical solution is confirmed. Recommendations are given on its implementation on rolling mills working with impact loading.