Effects of Screw and Speed-setting Changes on Gauge Speed and Tension in Tandem Mills

Abstract

The rule that governs the steady state of tandem mills is that the volume of metal passing through each stand in a given time is the same. If the screw setting of the rolls or the speed of the motor on any one stand is altered so as to alter the flow rate, then the other stands must be capable of adjusting themselves to this disturbance with fixed screw and speed settings. They are able to do this because the mechanical parts of the mill are sufficiently resilient to permit the separation of the rolls to alter even though the screws are fixed, and because the characteristics of the motor drive are such that the mill speed may vary even though the speed setting is fixed.

In this paper an attempt is made to relate the changes in interstand tension and finishing gauge which result from such a disturbance to the mechanical and electrical characteristics of the mill, and to predict the behaviour of tandem mills under various conditions.

Get full access to this article

View all access options for this article.

References

Bland

D. R.

Ford

1948 Proc. I.Mech.E., vol. 159, p. 144, ‘The Calculation of Roll Force and Torque in Cold Strip Rolling with Tensions’.

Hessenberg

W. C. F.

Sims

R. B.

1951 Jl. Iron and Steel Inst., vol. 168, p. 155, ‘The Effect of Tension on Torque and Roll Force in Cold Strip Rolling’.

1952 Proc. I.Mech.E., vol. 166, p. 75, ‘Principles of Continuous Gauge Control in Sheet and Strip Rolling’.

Hill

1950 Proc. I.Mech.E., vol. 163, p. 135, ‘Relations Between Roll-force Torque, and the Applied Tensions in Strip-rolling’.

Hitchcock

J. H.

1935 A.S.M.E. Research Publication, ‘Roll-neck Bearings’.

Shayne

Zeitlin

1944 U.S. Patent No. 2,339,359.

Sims

R. B.

1952 Sheet Metal Industries, vol. 29, p. 869, ‘The Forward Slip in Cold Strip Rolling’.