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

Abstract

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 accurately control the accuracy of the roll gap, and can raise its production efficiency.

Description

[0001] Field: [0002] The invention relates to an automatic control system of a rolling mill, in particular to a method for controlling the roll gap of a strip finishing mill. Background technique: [0003] In the production process of hot-rolled plate and strip, the control of the roll gap of the finishing mill is mainly completed through the calculation of the process computer. Calculate the temperature value of the finish rolling entrance, the temperature value of each finish rolling stand, the rolling force value of each finish rolling stand, and the roll gap value of each finish rolling stand, and send the calculation results to the first-level computer. The first-level computer controls the PLC, and adjusts the pressing motor and the hydraulic device to adjust the roll gap through the PLC. In general, the calculation of the entrance temperature of finish rolling is mainly through the computer network control system. The actual value of the head temperature of the inter...

AI Technical Summary

Problems solved by technology

After the head-to-tail conversion of the hot coil box, due to the change of the physical position, the heat conduction and heat radiation of the intermediate slab coiled by the hot coil box have also undergone great changes, which leads to the calculation of the traditional temperature reduction model The temperature is inaccurate, which leads to inaccurate calculation of the entrance temperature of finish rolling, which also makes the calculated entrance temperature and exit temperature of each stand of finish rolling inaccurate, the calculation of rolling force of each stand is inaccurate, and the rolls of each stand are inaccurate. The seam pre-calculated value is inaccurate, resulting in inaccurate exit thickness, which affects the product quality of the finished strip, and the head hit rate of process control is only 72%

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