| 摘要 |
A plate thickness controller for producing a good product by controlling the plate thickness while taking account of the variation in rolling speed due to the oil film thickness of the oil film bearing of a backup roll and the variation resistance of a rolling material thereby reducing the deviation of actual plate thickness from the target plate thickness on the exit side of a rolling mill over the whole speed region. In the plate thickness controller for controlling a material to be rolled by the rolling mill to a predetermined target plate thickness, an oil film thickness compensation value for compensating increase/decrease of a gap due to variation in oil film thickness of an oil film bearing caused by the rolling speed and an acceleration compensation value for compensating increase/decrease of the plate thickness on the exit side of a rolling mill due to a change in the deformation resistance of the rolling material caused by the rolling speed are calculated, and then the deviation of a predicted film thickness from the target plate thickness is calculated while also taking account of each compensation value thus operated.
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