Design And Realization Of ShouQin Company 4300mm Heavy Plate Mill Production Line Ultra Fast Cooling Control System

As a new generation of water cooling method, Ultra Fast Cooling (UFC) technology is widely applied in heavy plate production line. There are lots of successful cases in domestic and foreign steel plant. Therefore UFC unit has become an essential part of heavy plate production line. Under the severe steel market, Shouqin Company solved the produce bottleneck and improved the performance and the quality of the plate by UFC unit.This paper analyze the necessary function of UFC unit in detail. According to the realization of the function of UFC unit, the paper provided the detail solutions. In order to solve the problem of flow accuracy, the valve characteristics is calibrated, then it can get the valve position characteristic curve. Based on valve characteristic curve and chose the feedforward control and feedback control so as to the difference percent of the actual value and the set value under the 3%.In order to enhance the longitudinal temperature uniformity of cooling steel plate, the article analyze the main factor causing the temperature gradient of the steel plate. After improving the accuracy of material tracking, draw into the mode of acceleration control. By gradually promoting the roller table speed during the process of water cooling, water-entry velocity of different longitudinal position of steel plate and cooling time have been compensated and the temperature gradient of steel plate surface has been modified, which achieve the uniformity of longitudinal temperature distribution of the steel plate after water cooling. In additional, designing for top frame lift and down function, sparying control, network communication, interlock function and so on, all function has come ture. Only connecting UFC system to the rolling line system, UFC ability can be developed as expect, so the UFC network system has been designed circumstantially.After all function running normally, using UFC for production develop and result conformation. From the result, the temperature deviation, temperature uniformity, plate shape and so on. Finally, the function of UFC unit reached the expected effect. The cooling plate gets through the HPL by one pass, and the plate shape reached the requirement.