METHOD FOR STRAIGHTENING CONTINUOUSLY CAST BILLET

摘要

PURPOSE:To always obtain a sound cast slab by arranging temp. sensor for measuring temp. of the cast slab advancing between pinch rolls and changing rolling reduction force to the cast slab with the pinch rolls to the optimum value set according to the temp. and steel kind of the cast slab successively. CONSTITUTION:In a control panel 8 composed of a sequence (CPU) and a power amplifier, the optimum value of the rolling reduction force preset with the steel kind and the cast slab temp., is stored. The control panel 8 calculates the optimum value of the rolling reduction force of the pinch rolls 5, 5... at this time according to steel kind information obtd. from on-line information 9 and temp. information obtd. from the temp. sensor 7, and outputs hydraulic command signal to be loaded to a hydraulic cylinder 6 to a proportional electromagnetic type pressure reducing valve 10. Hydraulic detecting system 12 executes feedback of the hydraulic signal loading to the hydraulic cylinder 6 to the control panel 8 to stabilize the control system. By this method, the rolling reduction force is changed to the optimum value according to the cast slab temp. successively and the sound cast slab can be obtd.