Abstract
Problems concerning reduction of the dynamic loads on the horizontal and vertical rolls of universal rolling-mill stands are examined. The unacceptably large shock loads that develop in the equipment of the vertical stand when the strip is captured by the rolls of the horizontal stand are illustrated by using the example of the electric drives of the stands in the continuous subgroup of the roughing train in a 2000 hot-wide-strip mill at the Magnitogorsk Metallurgical Combine. A method is proposed for reducing these shock loads by automatically matching the speed at which the strip leaves the preceding vertical stand to the speed at which the strip is captured by the succeeding horizontal stand. A method is also examined for correcting the speed of rotation of the vertical-stand rolls based on the difference between the currents of the electric drive during free rolling of the strip and its simultaneous rolling in both stands. Oscillograms that are presented confirm the effectiveness of the proposed control methods, and recommendations are given for their industrial use.
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