METHOD FOR CONTROLLING PULLING-OUT PITCH

摘要

PURPOSE:To efficiently execute hot rolling of a steel slab by executing correction of pulling-out pitch by considering the root mean square value (RMS) of current required for rolling of the slab in a furnace in the hot rolling equipment at the next process at the time of pulling out the heated steel slab from the heating furnace. CONSTITUTION:The steel slab pulled out from the heating furnace 1 is wound into a coiler 5 as a steel sheet after rolled by rough rolling mills 2, 3 and multi- stage finishing mills 4. In this case, the ejecting pitch of the steel slab pulled out from the heating furnace 1 is found from the actual current of the pulled out slab by the current root mean square value (RMS) for required rolling. Next, the RMS of the steel slab in the heating furnace to be pulled out and rolled after this is predictively calculated and the actual RMS is added to the calculated RMS and the pulling out pitch of the steel slab from the heating furnace is decided as the future RMS. The rolling work can be executed under the max. load of the motor for rolling and the rolling work having extremely high efficiency can be executed.