Abstract
An open-loop dynamic spray cooling control strategy is explained in details. The strand was divided into many slices of a certain length and the midpoint of each cooling zone was set as a control point. The casting speed and temperature of each slice were tracked by using a control algorithm. Compared with the steady-state control model, the maximum temperature fluctuation values of cooling zone I–IV dropped from 70°C, 61°C, 51°C and 35°C to 17°C, 16°C, 12°C and 10°C, respectively, when using the dynamic control strategy in theoretical case. This dynamic control strategy has been applied to an actual billet continuous casting machine. The results of field trials showed that the surface temperature of the billets was well stabilized at the target temperature, and the number of strand defects, such as mid-way cracks, was reduced significantly.
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