Method for regulating the pull in continuous rolling trains and rolling train which adopts said method.

摘要

Method to regulate the pull in continuous rolling trains, in which the value of a reference speed (V) is monitored in conditions where a bar (11) is substantially free (not under drawing action) while said bar (11) is being rolled, in which the measurement of the value of the reference speed (V) when the bar (11) is substantially free of pull is obtained by means of variation of the speed (V) of the motor (12) of the involved stand (10) by an increase (x1) of the speed (V), by a return thereafter to the reference value of the speed (V) and by a reduction (x2) of the speed, followed by a final return to the reference speed (V) or re-aligned speed (V min ), while monitoring the formation of a microloop on the rolled product. Rolling train for carrying out the above method, comprising for each stand (10) an assembly to sequence a change of speed (14) connected to a speed cascade control assembly (18) and to an incremental assembly (16).