ESTIMATING METHOD FOR MEAN TEMP. INSIDE CROSS SECTION OF ROLLING STOCK IN CONTINUOUS HOT ROLLING OF STEEL BAR AND WIRE

摘要

PURPOSE:To correctly estimate the average temp. inside the cross section of a rolling stock by making in advance the table showing the relation between the surface temp. of the rolling stock and average temp. inside the cross section under the representative operation conditions and by estimating based on the extract temp. of a billet from a heating furnace measured actually and others. CONSTITUTION:The average temp. inside he water cooling finished cross section after forcible cooling of the case executing a control cooling in a rear step cooling zone 25 is found. In this case the temp. distribution state is determined by the temp., cooling water flow and cooling time of the rolling stock at the inlet side of the rear step cooling zone 25. The temp. of the rolling stock at the inlet side of the rear step cooling zone 25 is determined by the extraction temp. and rolling speed of the billet fed from a heating furnace 20. The average temp. inside the water cooled finishing cross section of the rolling stock can be therefore correctly estimated by measuring the surface temp. of the rolling stock after knowing of the water cool finishing temp. distribution state by the extraction temp. and rolling speed of the billet and cooling water flow in one of pass schedule of the rolling stock.