B - Operations – Transporting – 21 – B
Patent
B - Operations, Transporting
21
B
341/42
B21B 37/16 (2006.01)
Patent
CA 1122307
AUTOMATIC GAUGE CONTROL IN TANDEM STRIP MILLS ABSTRACT OF THE DISCLOSURE A method and apparatus for automatically controlling the gauge of metal strip rolled in a tandem strip mill. Load cells installed on a first stand generate signals represen- tative of changes in the roll-separating force, and hence of gap error, at this stand. Such signals are fed-forward, with a delay to allow for transport time of the strip minus screw- reaction time, to a second stand to effect screw adjustment of the latter. Signals representative of gap error at the second stand, corrected for changes in the position of the screws at the second stand, are fed-forward to effect screw adjustment at a third stand, etc. The screws of the first stand are maintained at their original setting, while adjustments in the screws of succeeding stands made in response to changes in the roll-separating force are effected exclusively by signals fed-forward from a preceding stand. The invention also includes an improved method and apparatus for delaying transmission of analog signals for controlled intervals without need for converting the analog signals to digital signals.
308727
Borden Ladner Gervais Llp
Uss Engineers And Consultants Inc.
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