| 摘要 |
PURPOSE:To reduce the generation of off-gauge at the time of hydraulic rolling reduction, by correcting rolling conditions so as to eliminate the effect on a gauge caused by the change of the condition of lubricating oil to be supplied to rolling rolls, in controlling the gauge by utilizing the Hooke's law. CONSTITUTION:The fluctuation of rolling load is detected as a function of an oil flow rate to be detected by a detector 9 prior to rolling, and is stored in a function generating device 30. Directly after a material 1 to be rolled is bitten by rolling rolls 2, a rolling load P0 is detected by a load cell 7 and is stored by a memory 10. After a fixed period of time from the instant of biting, a valve 5 opens to feed an oil to the rolls 2 from nozzles 4. When a rolling load is detected, a sheet thickness controlling device 20 inputs the load and calculates and a hydraulic rolling reduction device 6 controls a draft position to control the automatic sheet thickness basing on the calculated results. When a hydraulic reduction rolling is started, the detector 9 outputs a flow rate F, and the device 30 outputs the fluctuation quantity of rolling load DELTADELTAP to an adder 40 basing on the flow rate F to correct the rolling load P0 to a P'0 (=P0-DELTADELTAP). After said correction, the device 20 calculates the sheet thickness controlling signal basing on the standard load that is the corrected one. |
