Online control system capable of improving rolled piece thickness control precision

Abstract

The invention provides an online control system capable of improving the rolled piece thickness control precision. According to the system, a rolling mill rack inlet side rolled piece temperature measuring device and a rolling mill outlet side rolled piece thickness measuring device are used for carrying out compensation calculation on a roller gap in real time, specifically, according to measured data of the rolled piece temperature measuring device and the rolled piece thickness measuring device, the influence coefficient of the rolled piece plastic machining temperature relative to the rolled piece thickness changes is calculated, and therefore the increasing and decreasing value, generated by temperature changes of a rolled piece, of the rolling mill outlet side rolled piece thickness is calculated; meanwhile, the material physical property correction value is used for compensating for the influence of the machining temperature on the rolled piece physical property, and through the roller gap deviation calculation result, the roller gap is subject to real-time compensation control; the problem that due to rolled piece plastic machining temperature unevenness, the thickness control precision is poor is solved, and the thickness control precision of different thickness specifications can be improved by 2% or above.

Description

technical field [0001] The invention belongs to the field of metal plastic processing control, and in particular relates to an on-line control system for improving the thickness control precision of rolled pieces. Background technique [0002] The thickness index of the rolled piece is one of the most important quality indicators for the control of the rolled piece, and the factors affecting the thickness control mainly include the following aspects: slab temperature change, strip tension change, speed influence, roll gap change, etc. In the production of hot-rolled strip steel, automatic thickness control (AGC) is one of the main means to improve the accuracy of thickness control. Therefore, a complete automatic thickness control system needs to fully consider the influence of various factors on thickness control, and have corresponding The compensation function is eliminated. [0003] At present, the thickness automatic control system is mainly divided into two control mo...

AI Technical Summary

Problems solved by technology

Although this patent can obtain the strip plasticity coefficient of different sections of a rolled strip, that is, the change of the strip plasticity coefficient caused by the hardness change of the rolled piece is taken into account, but in this technical scheme, F x The roll gap adjustment amount of the stand is calculated based on the thickness control deviation and the plasticity coefficient of the strip, without considering the roll oil film thickness, roll shifting, roll bending force, roll surface wear, and roll thermal expansion during rolling. influence, corrected only with fixed compensation values

Therefore, the method of this patent will still cause the strip thickness control accuracy on the exit side of the rolling mill to be poor

At the same time, this control method can only be applied to two or more continuous rolling stands, and is not suitable for the thickness control of a single-stand rolling mill

Images