Crown control method for a multi-roll rolling mill

Details Crown control method for a multi-roll rolling mill Crown control method for a multi-roll rolling mill

1985-10-08

1987-04-14

Spruill, Robert L.

Metal deforming

With use of control means energized in response to activator...

Metal deforming by use of roller or roller-like tool element

72242, 72243, B21B 3700

Patent

active

046568557

ABSTRACT:
A method is set forth for use in crown control in a multi-roll rolling mill, the method including the steps of: setting in advance a shape of a thermal crown of a work roll corresponding to various rolling conditions and a changing gradient of a mechanical crown for each rolling speed zone applied to a work roll which is determined according to a change in time of a thermal crown relative to a change in rolling speed; applying a roll bending force, as an initial value, to the work roll, controlling the roll bending force from the thermal crown shape and an initial value of a mechanical crown amount at a suitable position of the work roll which is determined from an expected rolling schedule and a target mechanical crown amount at a standing speed; detecting the rolling speed; selecting the changing gradient of the mechanical crown according to the rolling speed zone at that time; and at the same time adjusting the roll bending force applied to the work roll.

REFERENCES:
patent: 3054310 (1962-09-01), Varner
patent: 4244025 (1981-01-01), Alshuk

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