G - Physics – 05 – D
Patent
G - Physics
05
D
341/44, 80/51
G05D 5/03 (2006.01) B21B 37/52 (2006.01)
Patent
CA 2031053
A CONTROL SYSTEM AND METHOD FOR COMPENSATING FOR SPEED EFFECT IN A TANDEM COLD MILL ABSTRACT OF THE DISCLOSURE In an arrangement for a tandem cold mill in order to compensate for "speed effect," each stand has a roll force memory unit and an oil film roll force controller unit which operate together, and in conjunction with a tensiometer, to maintain a relatively constant roll gap during the acceleration and deceleration phases of the mill. In threading, in tailing out, and in a full run speed of the mill, the roll force memory unit is constantly operating to obtain a "lock on" roll force reference for the stand prior to the acceleration or deceleration phase. A roll force error signal, which is the difference between a roll force reference of the roll force memory unit and an instantaneous roll force, enters the oil film roll controller. A proportional integrator type controller in the oil film roll force controller unit changes the roll force error signal within a limit of + 25% of the desired tension. This oil film roll controller produces a tension reference signal which is compared to the desired tension and selectively with the actual tension to produce a tension error signal used to control the roll gap control system of the stand or used to provide a speed change reference for the downstream stand.
Larsen John A.
Peterson Robert S.
Aeg Westinghouse Industrial Automation Corporation
Mitchell Richard J.
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