METHOD AND CONTROL DEVICE FOR CROSS ROLLING DOWN

摘要

PURPOSE:To prevent the buckling and draw-in of a strip material in cross rolling down by the vertical rolling pairs between rolling mills with looper tension application by controlling the reduction with horizontal rolls and reduction with the vertical rolls by the difference in the tension in the transverse direction of the looper. CONSTITUTION:The strip material 8 is given with a prescribed tension by the looper 7 between the horizontal rolls and is cross rolled down by the vertical roll pairs 10a, 10b. The pressures of the load cells 9a, 9b of the looper 7 and the pressure difference are calculated 13 and right and left screw down cylinders 5a, 5b are controlled by a gap controller 14. The right and left cross screw down cylinders 10a, 10b are controlled by a screw down controller 15. The roll gap and the rolling-down position of the vertical rolls of the front stage stand are adjusted and the buckling and draw-in of the material 8 are prevented. The accuracy of the strip width is further improved and the improvement of the edge drops and the formation of the rectangular end faces are made possible.