Looper control system for a rolling mill

Details Looper control system for a rolling mill Looper control system for a rolling mill

1995-11-24

1998-02-17

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

72 123, 72205, 36447208, B21B 3700

Patent

active

057181381

ABSTRACT:
A looper control system has a looper that is interposed between two rolling stands of a tandem rolling mill and is actuated by a hydraulic actuator; and a control calculating section for calculating a speed change rate command value of a primary rolling machine and a pressure command value of a hydraulic looper actuator so that an interstand tension and a looper height can be both controlled at target tension and looper height values, respectively, on the basis of a detected looper height value and a previously determined control gain. A resonance frequency changing section detects hydraulic flow rate of the hydraulic actuator and multiplies it by a gain to obtain a first speed change rate command value; and a damping constant changing section detects pressure in the hydraulic actuator and multiplies it by another gain to obtain a second speed change rate command value. The first and second speed change rate command values are added to a speed command value, and the total is set to the primary rolling machine speed controller.

REFERENCES:
patent: 4507946 (1985-04-01), Koyama et al.
patent: 5040395 (1991-08-01), Seki et al.
Publication entitled "Generalization of ILQ Optimum Servo System Design Method," Takao Fujii and Taku Shimomura, Proceedings of System Control Information Society, vol. 1, No. 6, 1988, pp. 194-202 (includes English abstract).
"The Robust Control Problem," Robust Control Toolbox User's Guide, pp. 1-12 - 1-55.

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