Method of improved gage control in metal rolling mills

B - Operations – Transporting – 21 – B

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B21B 37/18 (2006.01)

Patent

CA 1198496

METHOD OF IMPROVED GAGE CONTROL IN METAL ROLLING MILLS ABSTRACT OF THE DISCLOSURE In a metal rolling mill of the type employing automatic gage control (AGC) to control the gap between the rolls utilized to reduce the thickness or gage of a workpiece passed between the rolls, there is provided a method for compensating for roll irregularities (e.g., eccentricity and ovalness). The method provides for developing signals proportional to the roll separation force and the roll rotational speed and isolating the force signal those cyclic components which have a frequency which is an integral multiple of the roll rotational speed. The values of these cyclic components are then multiplied by a factor greater than unity and the resulting product is substracted from the original force signal to thus develop a modified force signal which is utilized to control the AGC and hence the roll gap to thus compensate for roll irregularities.

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