Method of controlling mill motors speeds in a cold tandem mill

Details Method of controlling mill motors speeds in a cold tandem mill Method of controlling mill motors speeds in a cold tandem mill

B - Operations, Transporting

21

B

318/16, 341/48

B21B 37/00 (2006.01) B21B 37/46 (2006.01) B21B 1/28 (2006.01)

Patent

CA 1178693

ABSTRACT OF THE DISCLOSURE This invention concerns a method of controlling mill-motor speed in a cold tandem mill. During unsteady phases of rolling operation such as threading, rolling speed acceleration and/or deceleration, and tail out with respect to the coil being rolled, mill motors are so con- trolled as not to perform drooping characteristic action except under certain specific conditions, and at threading phase in particular, motors in individual stands are so controlled as to revolve at a uniformly decreased speed, whereby final gauge control accuracy can be improved with respect to top and bottom end portions of the coil and such troubles as coil cut and the like can be effectively prevented.

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