Control Method Research Of The Hot Strip Width Control System

With the rapid development of market economy, metallurgical products becoming more competitive. It is necessary to improve the rate of finished products in order to maintain an invincible position in the fierce market competition. Width control is an important part of hot-rolled products quality control and increasing the accuracy of width dimension control is an significant means to improve the quality of hot rolled strip products. The width of the bias each reduce lmm, then the rate of finished products can be increased by0.1%. Therefore, we conducted a research on the control method of the steel strip width control system in Qiangang.The strip width accuracy is a principal indicator of the quality of hot rolled strip products. Because the width of the accuracy can not only improve the rate of finished products, but also can supply production conditions to hot-rolled users and posterior processes.So the development and application of the width control technology will bring significant benefits in increasing the width control precision,saving energy and improving economic efficiency.The paper is mainly researching on Qiangang1580hot-rolling strip width control system. On the basis of referring to extensive relevant literature, we optimize the parameters and models of currently existing strip width control system for seven optimizations including equipment, instrumentation, model and so on. Through taking the control method of fuzzy PID, the control of width of precision is implemented effectively.By doing these experiments, in the case of external disturbance, fuzzy PID rule which is less control overshoot than the basic PID can return to steady state in a very brief period of time and it contains good robustness. The width of the accuracy has been effectively controlled and the hit rate to width precision of Qiangang steel products is substantially increased.