Study For The Key Technology Of The Control System For The Igc650hcw Cold Strip Rolling Mill

The accuracy of strip cauee and the strip flatness are two quality targets of strip production. At present. they have huge advancement with the development of rolline theory, control theory, and artificial intelligence theory and with their application in the rolling process. However. It抯 still one of researching hotspot problems in strip gauge control field these days that single stand special type strip mill adopts special control technology and achieves micro level control accuracy. HCW strip mill whose working rolls move along axis direction can improve control effect of bending force and can make its abrasion equal. so it is widely used in practical engineering. This paper contents 揑GC 65GHCW cold strip mill systenf which is one sub-item of 慣he whole set equipment and study of correlation technologies of IGC 65OHCW cold strip milV~. awarded second prize of national science and technology of 1999. It researches wholly and by the numbers the inner roll-gap control technology, used in HCW strip mill, and some key practical problems. .~t present. many scholars have deeply studied analysis and synthesis of dynamic math model of gauge closed-loop control system of the hydraulic cylinder displacement. while few studies that of inner roll-gap closed-loop control system. The paper introduces the conception of roll-gap strip mill stiffness to HCW strip mill that adopts inner roll-gap control. Measures stiffness of strip mill for the roll-gap closed-loop and hydraulic cylinder displacement closed-loop, and establishes dynamic math model of inner roll-gap closed- loop gauge control system using mechanism analysis method. In order to decide if the above dynamic math model can describe practical system, this paper identifies two kinds of closed-loop gauge control system based on locale true measure data in special conditions. Secondly, it simulates the control parameter optimization of the two kinds of position inner-loop control. and compares its simulation results with that of ignoring subordination factor and simplification. Thirdly. it simplifies dynamic math model of inner position ioop. At the same time. it eives the structure diagram of gauge control system. a~~usting the gauge of the strip based on displacement and tension. These provide theory basis for inner roll-gap gauge-control system of HCW strip mill. Self-tuning control and self-tuning control based on neural network are applied in position inner loop in view of slow time-variation and random disturbance of the control object of the position inner loop of the gauge system. The simulation shows that adopting self-tuning control can eliminate the effect. In addition. a certain of non-linearity is introduced to position inner loop for gauge control. The simulation and theory analysis of Ill non-linearity system based on neural network self-tuning shows that the theory has some non-linearity control characteristic. Based on theory inferring and locale tests and experiments, the paper proposes pressure inner-loop hemidifferential coefficient control technology, on-line revision of amplifying coefficient of tension loop according to true value of the roll diameter control technology, variable integral time constant adaptive control technology of the real-time change of integral time constant of gauge control tache according to rolling speed, compensation of bending force of IGC HCW strip mill control technology, etc. By using these technologies,...