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Advanced Control Techniques For Rolling Mills
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| Author(s) |
Aldo Balestrino, Alberto Landi, Luca Sani |
| Abstract |
This paper addresses the problem of the product
quality improvement in hot rolling mills. The simplest scheme
for modeling the rolling process considers the reduction of a
strip thickness by passing the hot strip through a preset roll gap
between two work rolls. Each rolling stand is driven by a DC
motor, which is equipped with a speed controller. Usually the
two DC motors are separately controlled; i.e. each servo drive
acts only on its motor, by imposing equal set points. An
important condition to guarantee for a high product quality is
the equalization of the motor torque acting on the two work
rolls. Experimental data show that small differences between the
angular speeds of the upper and of the lower work rolls lead to
sensible differences between the two motor torques,
deteriorating the product quality. A combined-control of the
upper and lower DC servo-drives reduces the speed fluctuations;
different control techniques, - including variable structure PI
controllers - are proposed, evaluated and compared by extensive
simulation tests. |
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| Filename: | A77141 |
| Filesize: | 518.7 KB |
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| Type |
Members Only |
| Date |
Last modified 2006-02-17 by System |
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