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Improved Quality of Hot-rolled Coil by Means of Advanced Control Methods

European Communities

出版	Publications Office of the European Union, 2004
URL	http://books.google.com.hk/books?id=rDQ-yQEACAAJ&hl=&source=gbs_api

註釋

Ln order to satisfy downstream and customer requirements referring to strip quality features such as thickness profile, camber, width and flatness, all influences on strip quality, such as inter-stand tension, strip tracking, roll bending and roll shifting, strip cooling and strip coiling, have to be taken into consideration by a comprehensive control strategy valid for the threading phase as well as for the rolling phase. As a result of comprehensive analyses of the hot-rolling process, dynamic multivariable models were developed as a basis for the enhancement of advanced control strategies. For camber control in the roughing mill, using a new camber measurement system, a multivariable command module capable of the separate control of the roughing mill by drive and operator side gap actuators was developed and integrated into the roughing miIl gap control, which led to a significant reduction of camber defects of the transfer bar. Furthermore, a considerable increase of the strip-head end quality was gained by improvements of the finishing mill set-up models, particularly by the improvement of the estimation of the steel hardness. An advanced flatness control structure was developed, based on the principles of model predictive controI (MPC), embedded in an internal model controI (IMC). The performance of this multivariable control system was evaluated by computer simulations. These investigations encompassed the development of a detailed non-linear simulation of a hot-strip rolling mill and the development of real-time code to implement a predictive controller, with constraints.