Abstract
The control of tension in processing lines for metal strips tackles several problems. The process of achieving high tension driven by a multi-motor drive system, where the motors are mechanically coupled by a strip, is affected by the maximal torque of each drive, by friction between the strip and the surface of the tension roll, and by the wrap angle. The friction itself and the wrap angle are described by the eµα factor, which can be also calculated as the ratio of tensions in the strip in the previous section and subsequent section of the multi-motor drive. In this paper, an algorithm for the proper distribution of tensions in the strip for a multi-motor drive system of a continuous processing line is revealed. The algorithm ensures the tension distribution among particular drives of the tension leveler while respecting the physical limits of the drives and also preserving the desired conditions of a constant ratio between the input and output tensions for all drives in the leveler. The algorithm also prevents overloading of the drives. Finally, the algorithm was implemented in a control system of a strip processing line, and the obtained results correspond with the simulations. This, in turn, confirms the correctness of the algorithm design.
Highlights
Today’s sheet industry demands perfect flatness and outstanding surface quality of both hot- and cold-rolled metal strips
The algorithm described in previous sections was verified by simulation in a MATLAB/Simulink program of a tension leveler consisting of five tension rolls
The control systems for large continuous processing lines often consist of several programmable logic controllers (PLCs)
Summary
Today’s sheet industry demands perfect flatness and outstanding surface quality of both hot- and cold-rolled metal strips. Energies 2019, 12, 3010 on the wrap angle corresponding to the area of mutual contact surface between the strip and tension roll All these relationships are described by the well-known, so-called capstan equation [8] or the strip friction equation [9]. The algorithm presented in this article is not for tension control itself but for the proper distribution of the tensions among the drives in a strip processing line. It ensures tension distribution among the particular drives of the leveler while preserving the conditions of a constant ratio between the input and output tension.
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