Mthod for controlling roller gap of precision rolling machine of band steel

The present invention relates to a control method of roll gap of steel strip finishing rolling, mill, mainly including: using computer to successively calculate finishing rolling inlet temp. value, temp. values of all the machine frames of finishing rolling mill, rolling force values of all the machine frames and roll gap values of all the machine frames, setting and using computer to control PLC, and utilizing PLC to regulate screwdown motor and hydraulic device to regulate roll gap. Said invention also provides the mathematical model of finishing rolling inlet temperature, it can accuratelycontrol the accuracy of the roll gap, and can raise its production efficiency.