Plate thickness after rolling is determined by the gap between the upper and lower work rolls (WRs).The rolls shifting from their predetermined positions during rolling may cause thickness errors.Conventionally, the displacement in the rolling direction of the roll chocks during rolling was measuredusing a laser distance meter, or the like, installed in the rolling mill, and was used in facility management.The conventional method, however, has problems in that, for example, it cannot be used for continuousmeasurement and cannot measure displacements in the thrust direction of the rolls. This paper describesa new method of measuring equipment displacement, which has improved and stabilized the platethickness accuracy. A stereo camera system was adapted for the measurement. A method enablingthree-dimensional, continuous roll-displacement measurement was developed to quantitatively grasp thebehavior of the roll chocks during rolling. As a result, the cause of the displacement of WR chocks in thethrust direction was identified as the skew of WRs and buck-up roll (BURs), which was found to affect thethickness accuracy. These results were used to quantitatively estimate the skew angle from the thrustdirection displacement of each WR chock and rolling conditions, which allowed the thickness of the sideshim of each chock to be properly adjusted to improve the plate thickness accuracy.
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