Rolling mill eccentricity compensation using measurement of shee

Details Rolling mill eccentricity compensation using measurement of shee Rolling mill eccentricity compensation using measurement of shee

1985-09-06

1987-04-14

Larson, Lowell A.

Metal deforming

With use of control means energized in response to activator...

Metal deforming by use of roller or roller-like tool element

72 17, 72205, 364472, B21B 3706

Patent

active

046568549

ABSTRACT:
A method of eliminating thickness changes in material exiting a stand or stands of a rolling mill, the changes being caused by the eccentricity of one or more rolls of the mill. The method includes the steps of engaging the material with a device that measures the tension of the material entering or leaving the mill and using said device to measure directly a change in the tension of the material due to roll eccentricity. Samples of the change in tension are provided during the time required for a roll of the mill to make one revolution. The samples are then processed by characterizing them as frequency, magnitude and phase angle components of the change in tension. The components are then used in an update algorithm to provide a current estimate of a cyclically occurring change in tension. The current tension change is converted to an estimated thickness change, and processed in a manner that returns the same to a time-based value; the time-based value is used to correct for roll eccentricity by controlling the working gap of the mill in synchronism with currents of roll eccentricity such that the effects of eccentricity are offset.

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patent: 4428244 (1984-01-01), Takeda
patent: 4531392 (1985-07-01), Puda
patent: 4545228 (1985-10-01), Yamaguti et al.

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