| 摘要 |
PURPOSE:To prevent the trouble at passing the sheet, by detecting the rotational speed of the roll at the specified position of the steel sheet, by forecasting the time of arrival of the steel sheet's tail end at the roll, and by making the sheet length of the tail end to be unsupplied with the oil, constant independently of the change of the rolling condition. CONSTITUTION:The hot rolling apparatus, in which the oil is sprayed 3 against the backup roll 1b, works as follows. The pass-over of the tail end of the steel sheet 4 is detected 8 in front of the stand 1. At the same time, the rolling speed is taken in the operator 9 which then forecasts the time of arrival of the tail end at the rolling mill. Also, separately, the operator 9 operates the time required for rotation of the roll 1b. Then, the oil supply 3 is interrupted at the time resulted by these operations; hereby, the steel sheet's length being unsupplied with the oil is made constant. As a result, said trouble is prevented, and moreover, the oiled rolling work can be continued as long as possible, so that the electric power consumption, the roll consumption, per unit product, can be reduced, and the roll is prevented from the surface roughening trouble. |
