Metal deforming – With use of control means energized in response to activator... – Metal deforming by use of roller or roller-like tool element
Patent
1989-11-29
1991-05-07
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 10, 72 17, 72 19, 72205, B21B 3700
Patent
active
050126601
ABSTRACT:
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.
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Larsen John A.
Peterson Robert S.
AEG Westinghouse Industrial Automation Corporation
Kikel Suzanne
Larson Lowell A.
Schoeffler Thomas C.
Westerhoff R. V.
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