| 摘要 |
PURPOSE:To obtain a material-end shape free from folds by making the chamfering quantity of the edge corner of a material to be rolled, chamfered by vertical caliber rolls, asymmetrical in accordance with the temperature difference between both surfaces of the material, in a thick plate rolling method containing forming, broadside rolling, and finish rolling processes. CONSTITUTION:A rolling equipment has horizontal work rolls 2, 2a and vertical caliber rolls 3, 3a. The rolls 3, 3a are provided with a vertical caliber-roll shifting device 4, capable of shifting the rolls so as to usually aligning the caliber center with the thickness center of a material 1 to be rolled, and its driving device 5. Thermometers 6, 6a detect the temperatures of the upper and lower surfaces of the material 1 respectively, to transmit the temperature information to an arithmetic processing device 7. The device 7 calculates chamfering quantities 8, 8a i.e. the shifting quantities of rolls 3, 3a and an opening G between them, based on the relation between the temperature difference and rolling conditions, to output the shifting quantities to the device 5 and the opening G to a roll-opening adjusting device. Then the material 1 is positioned with respect to table rolls 10, and the shifting quantities of rolls 3, 3a are decided based on the vertically asymmetrical chamfering quantities 8, 8a obtained from said calculation results. |
