The Analysis And Improvement Of Screw Down System Of Baosteel Heavy Plate Finishing Mill

Baosteel5m heavy plate mill, which represents the advanced level of the same kind of machines in the world, put into operation on March,2005. Siemens TDC series controller with fast response, high control accuracy advantage is used in the stand control system.But the screw down control system (SDS)-the kernel part of stand control also emerged some problems during production:Because of Siemens used lots of "backroom" function blocks for kernel operation, we failed to completely grasp the core technology; During commissioning period the foreign SV mainly aimed at carbon-steel, without considering other special material. But current production we undertake a lot of silicon steel, trixiality production task, the thickness accuracy can’t reach the demand of production.In this situation, This paper star from analysing in depth in the original control model special for AGC system, grasp the mathematical principle and adjusting method, then implement the improvement and evaluate the effect. Finally we solved the problem which existed in the original system and increased thickness control precision substantially.The subject of research can be summarized as follows:(1) The thorough analysis of the current control modelAnalyse the work principle, realised way, function logic of the Siemens SDS and AGC model; summarize control diagram finally.(2) The characteristic analysis of SDS systemSDS system’s characteristic analysis is a important topic. Through the characteristic analysis, grasp the physical property of the stand.(3) The Improvement of AGC model and key control parameter.Research and realize the application of dynamic AGC model, which respond clearly the dynamic regulation process, raise overall system’s speed of response and the control precision, in heavy plate rolling control.(4) The summary of new created technology in production of heavy platesThrough carrying out this topic,it effectively improved the system stability,control level and product quality. Simultaneously this topic’s research results have great significance on technology promotion value and economic efficiency value.