Gage control for multistand rolling mill

Abstract

Abstract AN APPARATUS FOR CONTROLLING THE GAGE OF A METAL STRIP FROM ONE STAND OF A MULTISTAND ROLLING MILL HAVING AT LEAST TWO STANDS BY CONTROLLING THE SPEED OF ONE OF THE STANDS IN RESPONSE TO A SIGNAL FROM AN X-RAY GAGE, POSITIONED BETWEEN THESE STANDS, WHICH REPRESENTS DEVIATION FROM EXPECTED GAGE, DELAYED FOR A PERIOD OF TIME EQUAL TO THE TRANSPIORT TIME FOR THAT PORTION OF STRIP CONTAINING THE DEVIATION TO MOVE FROM THE X-RAY GAGE TO THE ROLL BITE OF THE SUCCESSIVE STAND, LESS THE RESPONSE TIME OF THE SPEED REGULATOR OF THE CONTROLLED STAND. THE GAGE DEVIATION SIGNAL IS ADVANCED THROUGH A SHIFT REGISTER CIRCUIT SUCH THAT THE DEVIATION INFORMATION IS STORED WHILE THE STRIP TRAVELS FROM THE X-RAY GAGE TO THE ROLL BITE OF THE STAND. A TACHOMETER PROVIDES A VOLTAGE WHICH CONTROLS THE PULSE RATE- OF THE SHIFTING PULSES SUCH THAT THE PULSE RATE IS PROPORTIONAL TO THE OUTPUT OF THE TACHOMETER, OR SPEED OF THE STRIP. THE GAGE DEVIATION SIGAL AFTER HAVING BEEN DELAYED IS DIVIDED BY THE GAGE REFERENCE, OR EXPECTED GAGE, SIGNAL FOR PRODUCING A CURRENT SIGNAL WHICH IS PROPORTIONAL TO THE UNIT DEVIATION. THIS SIGNAL IS THEN MULTIPLIED BY THE SPEED REFERENCE SIGNAL TO PRODUCE A VOLTAGE SIGNAL PROPORTIONAL TO THE ABSOLUTE SPEED CHANGE USED FOR ALTERING THE TENSION IN THE STRIP, THE REDUCTION OF THE STRIP BEING CORRECTED SO THAT THE DELIVERED GAGE OF THE STRIP REMAINS CONSTANT.

Inventors

• 👤 Paul E Dornbusch

Bibliographic Details