| CPC B21B 37/56 (2013.01) [B21B 37/46 (2013.01); B21B 37/48 (2013.01); B21B 2261/22 (2013.01)] | 9 Claims |
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1. A rolling control device that derives a preset load value in order to bring an elongation rate of a metal sheet to a target value or within a target range after a welded portion of the metal sheet passes through a temper rolling mill while rolling is suspended or under soft reduction, and outputs a reduction command based on the preset load value, the device comprising:
a computer processor including processing circuitry that:
derives an updated value of the preset load based on operation actual result values during a first period from a first timing to a second timing;
derives an evaluation index of the difference between a plasticity coefficient of the metal sheet during the first period and a plasticity coefficient of the metal sheet during a second period from the second timing to a third timing;
determines whether or not the updated value of the preset load derived needs to be updated again based on the evaluation index derived;
derives a re-updated value of the preset load based on operation actual result values during the second period when the updated value of the preset load derived needs to be updated again;
derives a first plasticity coefficient of the sheet based on ration actual result values at the first timing and operation actual result values at the second timing; and
derives a second plasticity coefficient of the met sheet or a physical quantity that is correlated with a plasticity coefficient of the metal sheet operation actual result values at the second timing and operation actual result values at the third timing, wherein
the preset load is a rolling load to be preset as a target rolling load of the temper rolling mill,
the first timing is a timing before a timing when a measured value of a rolling load at the temper rolling mill becomes the preset load,
the second timing is a timing when the measured value of the rolling load at the temper rolling mill has become the preset load,
the third timing is a timing before the measured value of the rolling load at the temper rolling mill becomes the updated value of the preset load derived, and
the evaluation index is an index determined based on the first plasticity coefficient and the second plasticity coefficient or the physical quantity.
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