Method and apparatus for eccentricity correction in a rolling mi

Details Method and apparatus for eccentricity correction in a rolling mi Method and apparatus for eccentricity correction in a rolling mi

1977-06-03

1978-11-21

Mehr, Milton S.

Metal deforming

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

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

72 21, B21B 3700

Patent

active

041260279

ABSTRACT:
A method and apparatus is disclosed for eccentricity correction in a rolling mill, in which prior to rolling, the eccentricity of the back-up rolls is measured and recorded both initially and each time the back-up rolls are changed. In an analog loop, constant roll gap is maintained by bidirectionally displacing the back-up rolls so as to maintain constant roll force in accordance with a reference roll force signal, the displacements being such as to neutralize the measured and recorded eccentricity. In a digital feedback loop, controlled by a digital computer, roll force is maintained constant in accordance with changes in the gauge of the work product, with the displacement of the back-up rolls producing a change in roll opening. The analog and digital control loops are cooperatively combined, so that the change in roll opening resulting from digital control, produces a new roll force reference for the analog loop. Effectively then, the intercooperation of analog and digital loops simultaneously produces roll eccentricity and gauge change compensation.

REFERENCES:
patent: 3881335 (1975-05-01), Cook
patent: 3882705 (1975-05-01), Fox

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