Metal deforming – With use of control means energized in response to activator... – Metal deforming by use of roller or roller-like tool element
Patent
1991-05-21
1992-12-22
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 11, 364157, 364161, 364472, B21B 3712, G06F 1546, G05B 1302
Patent
active
051725797
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a steering control apparatus for a plate rolled by a tandem rolling mill.
CONVENTIONAL TECHNIQUE
There is known a steering control apparatus for rolled plates, such as shown in FIG. 1. The steering control apparatus shown in FIG. 1 performs a steering control for a plate 101 rolled by a rolling mill 102, i.e., it controls to correct a deviation of the rolled plate 101 in the direction of its flow. At the exit side of the rolling mill 102, there are disposed a tension detector 103 at the operator side and a tension detector 104 at the drive side. The detectors 103 and 104 detect a tension 103A at the operator side and a tension 104A at the drive side. A difference, i.e., tension difference 111A=103A-104A between the tensions 103A and 104A is calculated by a subtracter 111. The tension difference 111A is supplied to a dead zone device 112 having a dead zone of a small difference range and set with a dead zone, and the output of the dead zone device 112 is supplied to a proportional integrator 113.
The dead zone device performs a dead zone process and outputs a tension difference .DELTA.T from the following equations: a value of the tension difference 112A after the dead zone process, T.sub.UL is an upper limit of the dead zone, and T.sub.LL is a lower limit of the dead zone.
The proportional integrator 113 performs a proportional integration operation of the tension difference 112A and outputs the result as a leveling amount 113A for correcting the snaking of the rolled plate 101. An absolute value limiter 114 limits the absolute value of the leveling amount 113A so as not to make it exceed a limit value, and outputs it as a limited leveling amount. A subtracter 115 subtracts the limited leveling amount 114A from an operator side roll gap position reference value 117A set by an operator side roll gap position reference value setter 117, to thereby output a leveling-amount-corrected operator side roll gap position reference value 115A. An adder 116 adds the limited leveling amount 114A to a drive side roll gap position reference value 118A set by a drive side roll gap position reference value setter 118, to thereby output a leveling-amount-corrected drive side roll gap position reference value 116A.
In accordance with the operator side roll gap position reference value 115A, an operator side roll gap position controller 109 and an operator side roll gap position driver 107 regulate the operator side roll gap position of the rolling mill 102. Similarly, in accordance with the drive side roll gap position reference value 116A, a drive side roll gap position controller 110 and a drive side roll gap position driver 108 regulate the driver side roll gap position of the rolling mill 102.
The operator side roll gap position driver 107 is equipped with a rolling load detector 105 for detecting an operator side rolling load of the rolling mill 102, whereas the drive side roll gap position driver 108 is equipped with a rolling load detector 106 for detecting a drive side rolling load of the rolling mill 102. The rolling loads detected by the detectors are used for feedback control of the rolling loads by load controllers (not shown).
With the steering control apparatus constructed as above, if the operator side tension 103A detected by the tension detector 103 is larger than the drive side tension 104A detected by the tension detector 104, the extension of the plate 101 rolled at the operator side is less than that at the drive side so it is judged that the rolled plate 101 snakes or shifts to the operator side. In order to correct this snaking, the leveling-amount-corrected operator side roll gap position reference value 115A is made small on one hand (i.e., the screw-down amount at the operator side is made large and so the roll gap is made small), and the leveling-amount-corrected drive side roll gap position reference value 116A is made large on the other hand (i.e., the screw-down amount at the drive side is made small so the roll gap is made la
REFERENCES:
patent: 3622767 (1971-11-01), Koepcke
patent: 4537050 (1985-08-01), Bryant et al.
patent: 4700312 (1987-10-01), Kikuma et al.
patent: 4754410 (1988-06-01), Leech et al.
patent: 4903192 (1990-02-01), Saito et al.
patent: 5043862 (1991-08-01), Takahashi et al.
Kabushiki Kaisha Toshiba
Larson Lowell A.
Schoeffler Thomas C.
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