Interstand tension control method and apparatus for tandem rolli

Metal deforming – With use of control means energized in response to activator... – Metal deforming by use of roller or roller-like tool element

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72 19, B21B 3700

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active

041377427

ABSTRACT:
The rolling force, rolling torque, incoming workpiece thickness and roll gap at a first rolling stand are detected when a workpiece is fed into the nip between the rolls of the first rolling stand to provide their reference values P.sub.10, G.sub.10, H.sub.10 and S.sub.10 which are stored in a memory, and the reference torque arm l.sub.10 is computed on the basis of the reference values G.sub.10 and P.sub.10 of rolling torque and rolling force. The rolling force, rolling torque, incoming workpiece thickness and roll gap at a second rolling stand are detected when the workpiece is fed into the nip between the rolls of the second rolling stand to provide their reference values P.sub.20, G.sub.20, H.sub.20 and S.sub.20 which are stored in a memory, and the reference torque arm l.sub.20 for the second rolling stand is computed on the basis of the reference values G.sub.20 and P.sub.20 of rolling torque and rolling force. The torque arms l.sub.1 and l.sub.2 for the first and second rolling stands are then computed on the basis of the reference torque arms l.sub.10, l.sub.20 ; detected rolling forces P.sub.1, P.sub.2 ; detected roll gaps S.sub.1, S.sub.2 ; detected incoming workpiece thicknesses H.sub.1, H.sub.2 ; and variations .DELTA.P.sub.1, .DELTA.P.sub.2, .DELTA.S.sub.1, .DELTA.S.sub.2, .DELTA.H.sub.1 and .DELTA.H.sub.2 of the reference values. The interstand tension is computed on the basis of the computed torque arms l.sub.1, l.sub.2, and detected rolling torques G.sub.1, G.sub.2 and rolling forces P.sub.1, P.sub.2, and the roll drive main motor is regulated to compensate the deviation of the computed interstand tension from the desired value to maintain the interstand tension constant throughout the rolling operation.

REFERENCES:
patent: 3457747 (1969-07-01), Yeomans
patent: 3807208 (1974-04-01), Hensleigh
patent: 3940960 (1976-03-01), Tanifuji et al.
patent: 4087859 (1978-05-01), Aube

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