Control method for multi-strand rolling mill

Details Control method for multi-strand rolling mill Control method for multi-strand rolling mill

1983-04-04

1984-07-03

Husar, Francis S.

Metal deforming

By use of roller or roller-like tool-element

Plural roller-couples

72 15, 72221, 72240, 72248, B21B 120, B21B 3708

Patent

active

044571542

ABSTRACT:
When two strand workpieces pass through a roll opening between two grooved working rolls on a roll stand so as to be rolled, the trailing end of one of them may leave the rolls and cause change in the roll separation. At that time mating bilateral screw-down devices are remotely controlled to adjust the roll opening at least at the position of the remaining workpiece. Alternatively in a multi-strand tandem rolling mill, the rolling speeds on roll stands upstream of a roll stand which one of the strand workpieces has left are changed by a speed ratio of (1-b.sub.2)/(1-b.sub.1) where b.sub.1 and b.sub.2 respectively designate rates of backward slip when two strand workpieces are being rolled and in the absence of one of the strand workpieces from the last-mentioned roll stand. Alternatively the roll speeds on roll stands downstream of the roll stand which one of the strand workpieces has left may be changed by a speed ratio of (1+f.sub.2)/(1+f.sub.1) where f.sub.1 and f.sub.2 respectively designate rates of forward slip corresponding to the rates of backward slip b.sub.1 and b.sub.2.

REFERENCES:
patent: 1935048 (1933-11-01), Gassen
patent: 2933956 (1960-04-01), Snow
patent: 3625043 (1971-12-01), Neumann et al.
K. A. Petraske, "Developments in Drive Systems and Gage Control for Reversing Cold Mills", Iron and Steel Engineer, 1961, pp. 151-157.

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