Tension control method for a rolling mill
AssigneeHitachi, Ltd.
InventorsYasuo Morooka, Shinya Tanifuji
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Abstract
In the control of the tension of a workpiece which is rolled by a tandem rolling mill, a tension control method for a rolling mill wherein the tension of a workpiece is controlled by a looperless tension control method employing no looper at the threading stage of the top end and at the tail-out stage, and it is controlled by a tension control method employing a looper during the steady rolling.
Claims12
In the control of a tension of a workpiece which is rolled by a tandem rolling mill, a tension control method for a rolling mill characterized in that a looperless tension control in which a tension is computed from a driving current for rolls and a rolling load and in which the tension is controlled in accordance with a deviation from a desired tension is executed during a threading stage of a top end of the workpiece and during a tail-out stage, while a tension control with a looper is executed during a steady rolling from completion of said threading stage of said top end to commencement of said tail-out stage, both the tension controls being changed-over in dependence on the rolling process so as to control said tension of said workpiece.
Dependencies are inferred from the claim text.