| 摘要 |
PURPOSE:To adjust the width of a mold and to improve the fluctuations in the width of ingots considerably by moving the width of the mold by as much as a required extent at the changeover timing for the casting speed determined beforehand from the prescribed coefft. of the relations between the predetermined rate of fluctuations in casting speed and the rate of fluctuation in ingot width. CONSTITUTION:To determine the relations between ingot width and casting speed, the actual value of ingot width H is determined with average width in the unit of 1m length of ingots from the past operations to know the rate DELTAH of fluctuatons in width, and the average velocity V in the unit of the 1m length of ingots corresponding to said rate is beforehand determined in terms of the speed during passing at the molten metal level. From both thereof, the relation DELTAH=f(DELTAVz) between the rate DELTAH and the rate DELTAVz of fluctuations in casting speed is beforehand determined. Thereafter, casting speed 5 and mold with 6 are controlled by a process controller 4 in accordance with the learning functions for the rate of fluctuations in ingot width of the broken line part 1 in the figure, the actual value 2 of the ingot width and the actual value 3 of the ingot speed, whereby the ingot is cast 7 at the specified width and the assigned width 8 is maintained. More specifically, the mold width is changed under desired conditions at the timing for changing over of the predetermined casting speed by using the above-described relation determined from the actual value 2 and the actual value 3. |
