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

1982-01-29

1984-07-17

Rubinson, G. Z.

Electricity: motive power systems

Plural, diverse or diversely controlled electric motors

Running-speed control

318 69, 72 8, B21B 3700

Patent

active

044608527

ABSTRACT:
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 controlled 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.

REFERENCES:
patent: 3387470 (1965-09-01), Smith, Jr.
patent: 3657623 (1972-04-01), Fludzinski
patent: 3892112 (1975-07-01), Smith, Jr.
patent: 4090118 (1978-05-01), Smith, Jr.
patent: 4137742 (1979-02-01), Tanifuji et al.
patent: 4145901 (1979-03-01), Imai et al.
patent: 4227130 (1980-10-01), Safiuddin et al.
patent: 4292825 (1981-10-01), Morooka et al.

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