Abstract
The forecasting of slab billet heating time in a continuous furnace before rolling enables forming of an optimal power saving heating path of each billet at the moment of its charge into the furnace. The optimal heating mode efficiency depends on the accuracy of the slab heating time forecasting, which is especially urgent amidst rolling mill variable performance. In the context of non-stationary run of a rolling mill and continuous furnace, the involved method provides for the improvement of the heating time not only subject to mill planned shutdown but also taking into account unpredictable emergency and undetected standing time within forecasting billet occurrence in the furnace. The paper gives theoretical and experimental justification of the suggested method of forecasting and improvement of each slab total heating time. Implementation and experimental check of the method revealed that the deviation of the total forecast heating time in the 4 min range is 90.4 % with the variation of the total heating time from 140 to 195 min and 457 slab sample volume.
Keywords
Continuous-cast heating time, slab billet heating before rolling, heating control, billet movement control, continuous furnace, slab billet detection, rolling mill, hot rolling.
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