Control Structure for the Reduction of Defects in Continuous Casting

The causes for surface defects in the con tinuouscasting process must be understood so that surface defects can be eradicated. The defects which were considered are presented and an approach to eliminate many of the in uencing variables using statistical hypothesis testing is presented. These methods show that only the thermocouple temperature readings within the mould are necessary to accurately predict the occurance of defects. The use of ARX modeling is then presented for a predictor which uses thermocouple temperatures as inputs and defects as outputs. A mould model can be determined in the same w ayusing con trolled variables as inputs and the thermocouples as outputs. Optimal control and feedback control can be used to diminish the defects.