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T. Kiefer, A. Kugi, O. Fichet, B. Bödefeld, R. Heeg, L. Irastorza:
"Control of front end bending in heavy plate mills based on analytical models";
Vortrag: International Steel Conference on New Developments in Metallurgical Process Technologies (METEC InSteelCon), Düsseldorf; 11.06.2007 - 15.06.2007; in: "Proceedings 3rd International Steel Conference on New Developments in Metallurgical Process Technologies", (2007), ISBN: 978-3-514-00742-0; S. 208 - 215.

In heavy plate mills the customer demands on the material properties, the thickness and flatness quality of the rolled plates are steadily increasing. Among others, a quality improvement can be achieved by the use of modern control strategies, whereby in particular model-based control has proven to be very efficient. In this contribution, we will present results on the modeling and control of the so-called ski phenomenon in heavy plate mills. A physics-based model for the
asymmetrical deformation of the material in the roll gap is derived and compared with both numerical data from Finite-Element (FE)-simulations and plant measurements. Thereby, the model is based on the upper bound theorem for ideal rigid-plastic material. Due to its reduced complexity compared to FE-models, this model only requires a short execution time and can thus be utilized for process control in a real-time environment. It is shown that especially a difference in the work roll circumferential speeds can be used to influence the ski-ends. As a consequence the drive train can be utilized as an actuator for the ski-end control and the design and application of an inversion-based multi-input multi-output (MIMO) controller for the upper and the lower drive train is discussed. Finally, the overall ski-end control concept for minimizing the occurrence of ski-ends is
presented and the way of its implementation is described.

Physics-based modeling, ski-end control, hot rolling, heavy plates, drive-train control