Research And Application On Hydraulic AGC Of Four Roller Mills In Medium Plate Factory

With the development of production and technology, customers demand more and more on the gauge accuracy of medium plate . Hydraulic gauge auto control is important equiment in assuring the gauge accuracy of pro duct. This dissertation is based on AGC system revamping of 2500mm finishing rolling mill at medium plate .Advanced and practical dynamic AGC control systems are used in medium plate according to it's actual situation and the developemt of computer. At the same time , analyazing the problems occurred and some better methods are introduced of the revamped AGC system.On the base of masting the hardware and software of hydraulic automatic gauge control ,we take advantage of the method of digital simulation to investigate the dynamic characteristic of hydraulic AGC system of rolling mill. The base of digital simulation is to transmit function of every loop of control system. On the basis of establishing the math model of hydraulic AGC,we analyaze the effect that pressure fluctuate impact on gauge control. Analying and researching the character of time range and frequence range of system by using the large math analyaze and operation software-Matlab .Research and perform theoretically calculation on control arithmetic of dynamic AGC,the mill modulus and roll stock characteristic have large influence on the results of AGC control due to the error of control model,when the mill modulus is low and roll stock plastic coefficient is high,it is not easy to reach the perfect purpose.so it's favorable to thickness control by improving the machine modulus,decreasing the influence of non-liner and difference in temperature in mill stock.Relatively AGC only ensure tolerance in the same plate,absoluteness AGC can ensure tolerance in different plate,in order to reduce the unsteady in non-liner of mill modulus curve,the roller meet tightly and adjust zero.analyzing the cause of axis force and how to reduce the force when the...