Method for the predetermined maintenance of narrow thickness tolerances during the rolling of rolling stock in hot-strip rolling trains

摘要

The invention relates to a method for the predetermined maintenance of narrow thickness tolerances in the rolling of rolling stock in hot-strip rolling trains by means of a process control computer which calculates the desired thickness values for the individual stands and by means of digital thickness control systems which calculate the actual thickness from the roll adjustment distance and the rolling force. The invention consists in that the action of the process control computer and of the digital thickness control systems takes place alternately in the following manner: a) before introduction of the stock, the operating-point parameters are, as an additional operation, transferred from the process control computer to the thickness control systems, b) during the passage of the rolling stock through the respective rolling stand, the measured actual value of the rolling force and the calculated actual thickness value are transferred from the thickness control system to the process control computer, c) the digital thickness control system operates for the time required by the process control computer to calculate corrected desired thickness values and operating-point parameters from the values transferred, using the available values, d) the control operation is then continued with new desired thickness values which take into account the flatness of the strip and with new operating-point parameters which take into account the deformation resistance. <IMAGE>