The Research And Application Of The Flatness Control System In The Shougang 1850 Tandem Cold Mill

The accurate thickness and flatness control is the core of the cold-rolled strip quality. And the strip flatness is, however, not only one of the most important quality features of cold-rolled products, but also the significant factor which determines the competence in the market. In the past decades, although the research to the cold-rolled strip flatness has been the most important direction and we have continuously been creating the new methods and control ways, meanwhile we have got many developments in the theoretical and practical application. But in the cold rolling production, flatness is still the most frequent and the most difficult key technical problem to deal with.Based on the research of HC, and CVC flatness control and the flatness control technology like the vertical bending, traversing bending, roll traversing, roll crossing, multi-zone cooling and so on, and under the background of Shougang Shunyi 1850 flatness control cold stand mill, this thesis makes the research on the composition characteristics and control ideology of the stand mill NO.5's CVC six rolls stand mill's execution unit. These include hydraulic bending roll, intermediate roll shifting system, and stand mill NO.5's multi-zone cooling spraying equipment and so on. And then this thesis begins the research on this kind of stand mill's flatness control system's BFI flatness measuring, system component, data processing, TDC control function, flatness difference adjusting, and mathematic mode and so on. Besides, this paper also combines the practical problems that occur in the commissioning and the production to make analysis and put forwards the adjusting method of flatness curve, operation method of HMI system, the analyzing and detecting process of the classical faults and specific dealing plan and so on. This contains significant guiding value to direct the flatness system's application.Through the implement of this project, the flatness control system has reached the designing target and put into operation on schedule, so it has greatly guaranteed the successful production of the cold rolling plant. The research of this item will supply valuable practice experience for Shougang to exploiting its cold rolling industry, and it has profound practical meaning and popularizing value. This must bring Shougang with great market competitive ability and considerable benefit.