B - Operations – Transporting – 21 – B
Patent
B - Operations, Transporting
21
B
B21B 37/46 (2006.01) B21B 37/50 (2006.01)
Patent
CA 2163723
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.
Fetherstonhaugh & Co.
Toshiba Mitsubishi-Electric Industrial Systems Corporation
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