Importance

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Abstract

In controlling the passage of rolled stock under little longitudinal tensile stress through a continuous rolling mill by secondary-controlled hydrostatic drives for the individual rolling stands, the rotary speeds of the hydromotors associated with the drives are controlled by adjusting their displacement volumes. To obtain a rational and dependable control method, at the beginning of the passage of the stock, all but one of the rotary speed controls for the hydromotors belonging to the stands through which the stock has passed and the stand through which the stock passes next as the passage of the stock through the stands proceeds are consecutively interrupted during the consecutive passing of the stock through the rolling stands and, therefore, at any time only the hydromotor of one of the stands, the guiding stand, is operated with an adjustable displacement volume for controlling the rotary speed at least as long as the stock passes through all the stands.

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First Claim