A. Kawałek, Czestochowa University of Technology, Czestochowa, Poland The paper presents the results of asymmetrical plate rolling in the finishing rolling stand of a 3600 mill. The investigation was carried out for S690Ql steel sheets. Tests were conducted for two types of the asymmetric rolling process. In the first case, the asymmetry of the process was introduced by varying the speed of the...

The technological process for manufacturing seamless steel tubes in the Sisak Rolling Mill includes the heating of the charge for processing in the hearth-rotating furnace. Description of the furnace and its operation can be found in literature 1 . In the process currently applied for producing the tubes with the outer diameter of 168.3–356.6 mm the temperature is between 1280 and 1300 °C 2 . T...

The evolution of crystallographic texture during the thermo-mechanical processing aluminium sheet is accompanied by development plastic anisotropy and, most notably, well-known earing phenomenon. In present paper we analyse formation and properties in sheets Al-Mg alloy AA 5050A (ISO AlMg1.5(D)) along a process route resulting temper H16 after cold rolling H44 lacquering. This route, which char...

The work described here was largely performed at a medium-sized European steel mill, with an unusually diverse product portfolio, and hence a difficult scheduling problem to solve. The decision support system developed as a result has been successfully used, with minor modifications, at many steel mills worldwide. The work was carried out while the author was employed at A. I. Systems, Belgium,...

Work roll thermal contour is one of the important factors for roll contour design and configuration in hot strip rolling, for which the temperature field calculation is a critical factor. To realize the work roll thermal behavior for 1450mm hot strip mill, the temperature field and thermal contour calculation model was built with finite different methods, and the genetic algorithm was introduce...

This paper describes the development ,and installation of the 5 Mill Scheduler, a dynamic scheduling application for a hot steel mill. The main objective of the scheduler is to dynamically generate ,and revise schedules, ,and make effective use of the resources of the phant, while satisfying a complex set of constraints dealing with the dynamic behavior of the resources and the material process...

This work concentrates on three different modifications of a genetic programming system for symbolic regression analysis. The coefficient of correlation R is used as fitness function instead of the mean squared error and offspring selection is used to ensure a steady improvement of the achieved solutions. Additionally, as the fitness evaluation consumes most of the execution time, the generated...

This paper derives proportional-integral (PI) control algorithms for first-order plants with time lag. First, the effects of proportional control on overshoot and rise time are analyzed. Then these results are applied to aid in the design of PI controllers that utilize a pole-zero cancellation. New PI tuning methods are proposed for design criteria typical of those found in metal rolling mill a...

In this work heat flux thermography algorithms are proposed to suppress false indications that appear when testing steel billets with inductive thermography. Not only temperature amplitudes are used for evaluation but also the time dependancy of the temperature profile, different types of cooling rates and signal shape parameters. These new algorithms were tested successfully in a rolling mill....