PREVENTION OF CAMBER IN ROLLING OF PLATE MATERIAL

摘要

PURPOSE:To obtain a plate material having high flatness without having camber by predicting the camber quantity of a material to be rolled from the difference in the surface temps. between the top and bottom surfaces thereof, determining the difference in the circumferential speeds between upper and lower work rolls to correct the predicted camber quantity and controlling the driving thereof. CONSTITUTION:The temp. difference between the top and bottom surfaces of the material 11 of a prescribed size to be rolled is measured by a radiation thermometer 2 and the speeds of driving motors 20A, 20B are so set as to correct the circumferential speed ratio of the upper and lower work rolls 12 to the prescribed value. A rolling schedule is so calculated as to attain the prescribed draft. The rolling reduction and rolling load are predicted and the optimum setup quantity is determined. The lower work roll 12 is set in the optimum setup position. The material 11 is rolled in this state and the difference in the surface temps. between the top and bottom surfaces is detected. The quantity for correcting the speed difference of the rolls 12 is calculated in accordance with the temp. difference and the speeds of the rolls 12 are corrected.