The Finish Mill Model Applied In The Computer Control System For The Shot Strip Mill Of ShanDong TaiShan Iron&Steel Co.,Ltd.

The modern hot strip steel mill needs high-speed running equipment and sensitive and accurate control system. The action of controlling strip mill in a speed of several times of ten meters in a second in order to produce steel in a precision of mm level is not something accessible by human eyes or hands but by computer control systems.Basically, the traditional control system works partly automatic with all the configuration set by the operating worker, and this brings a big problem for the uninsured product quality and low producing efficiency. Thus hot strip steel math model has been the most important topic to be solved now. Math model is the kernel of hot strip steel computer control system, by using math models, the control system can fix all the factors of strip processing into a certain quantity during the process of selecting the best producing process through various physics or experiment model, thus making the evaluation of strip producing more scientific and formal. Through model controlling, the strip producing would also be more balanced, and get the required thickness and temperature, thus raising the control precision and product quality.In order to improve the control precision of the hot stripsteel, the process control system has been presented to the 950 mm hot strip mill of ShanDong TaiShan Iron&Steel Co. Ltd. It concludes: finishing mills setup, adapting thread correction and model learning, aiming at the precise control of the strip thickness, width and temperature.According to the related theories and the 950mm hot strip mill of ShanDong TaiShan Iron&Steel Co. Ltd real production, it sums up the complete math model of the product line, which includes rolling power and moment model, temperature model, forward slip model, bounce equation, rolling speed and roller gap calculation. The article introduces us the computer control system's whole frame for the 950mm hot strip mill of ShanDong TaiShan Iron&Steel Co. Ltd, the function of the model control system, its producing technique and equipment, and it also makes a detailed description and application research to the main math model, and analyses the diversified factor that it affects math model, also compensate them, and it also makes a detailed description to method of math model maintenance, especially to the roller gap setting calculation, which compensates mill bounce by self- impaction and inserting value calculation method, which invites us a new roller abrasion calculation method by using real time calculation to take the place of the original static abrasion compensating value. After model rolling and heat loading tests, this idea has been proved an important step to raising control precision and thickness control, thus it raises the product quality and producing efficiency, and saving the productioncosts as well.