Control method for a rolling train

摘要

Based on an actual temperature upstream of a roll stand, a predicted temperature is estimated for when strip sections of the strip will roll through the roll stand. The predicted temperature is used to predict material moduli, which is used to control a regulating device that influences a roll gap for the roll stand and to parameterize a roll gap control system. A roll gap profile is predicted based on the predicted temperatures, and is compared with a nominal roll gap profile. A regulating variable that influences a profile of a roll gap is set. The regulating variable is then corrected based on the comparison with the nominal roll gap profile. The predictions are made using a prediction horizon corresponding to a plurality of consecutive sections of the strip. Control is performed for both an operator side and a drive side of the strip.

主权项

1. A control method for a rolling mill train, comprising:
determining actual temperatures respectively for strip sections of a strip upstream of a first roll stand of the rolling mill train; predicting predicted temperatures respectively for the strip sections when the strip sections are rolled in the first roll stand, the predicted temperatures being predicted using a strip model, the predicted temperatures being based on the actual temperatures, the predicted temperatures being predicted using a first prediction horizon corresponding to a plurality of strip sections to be rolled in the first roll stand; predicting, using the predicted temperatures, a respective current operator-side and a respective current drive-side material modulus for the strip sections when the strip sections are rolled in the first roll stand, the material moduli describing how the strip sections respond to rolling; setting a manipulated variable characteristic, the manipulated variable characteristic being a sequence of values set respectively for the strip sections corresponding to the first prediction horizon, the manipulated variable characteristic being a characteristic that would, if supplied to an adjusting device, have an influence on a profile of a roll gap formed by work rolls of the first roll stand; predicting a respective predicted roll gap profile formed by the work rolls of the first roll stand at the time of rolling of the respective strip section, the predicted roll gap profile being predicted using a roll stand model, the predicted temperatures of the strip sections, the material moduli and the manipulated variable characteristic set for the strip sections corresponding to the first prediction horizon; optimizing the manipulated variable characteristic based on the predicted roll gap profile for the strip sections and a respective setpoint roll gap profile, the manipulated variable characteristic being optimized to produce an optimized manipulated variable characteristic; using a current value of the optimized manipulated variable characteristic as a control parameter; and controlling the adjusting device acting on the first roll stand during rolling of the respective strip section, the adjusting device being controlled using the control parameter, the adjusting device influencing the roll gap of the first roll stand on the operator and the drive side, wherein predicting predicted temperatures comprises predicting temperatures that are spatially resolved in a strip width direction, and the optimized manipulated variable characteristic for a specific strip section is produced by optimizing the whole sequence of values set respectively for the strip sections corresponding to the first prediction horizon.