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AssigneeSMS Schloemann-Siemag Aktiengesellschaft
InventorWolfgang Rohde
Estimating the term…
A method of operating a rolling mill for hot-rolling and cold-rolling of flat products in one or more roll stands each having two or more rolls, wherein the roll gaps are regulated so as to correct the differential force between the drive side and the operator side of the roll stands, while compensating the adjustment value-controlled regulation of the roll gaps which corrects the bending and balancing forces. Prior to further processing of the flat products, the regulation is supplied with an additional correction adjustment value formed from the horizontal forces measured in all individual rolls.
A method of carrying out an adjustment value-controlled regulation of roll gaps defined by rolls of roll stands of a rolling mill for hot-rolling and cold-rolling of flat products, the method comprising measuring rolling forces at a drive side and an operator side of each roll stand and correcting an adjustment of the rolls in dependence on differential rolling forces between the drive side and the operator side, further comprising additionally measuring axial forces of the rolls produced in a direction of roll axes as a result of rolling, and utilizing the axial forces as additional correction values for the roll adjustments, wherein the axial forces of individual work rolls are measured by force pickups mounted in supports of the rolls, and wherein the axial forces of rolls which are hydraulically displaced are measured by measuring hydraulic pressures in the rolls.
Dependencies are inferred from the claim text.
From the US filing history. Foreign family members aren’t listed.
Control devices or methods specially adapted for metal-rolling mills or the work produced thereby: control of flatness or profile during rolling…
Control of flatness or profile during rolling of strip, sheets or plates: using a combination of roll bending and axial shifting of the rolls
Control devices or methods specially adapted for metal-rolling mills or the work produced thereby: roll-force control; Roll-gap control
For measuring roll-gap, e.g. pass indicators: calibrating or presetting roll-gap
Term ended 29 Apr 2018 (estimated)
USPTO file history isn’t available for this patent, so only indexed dates are shown.
1. Field of the Invention
The present invention relates to a method of operating a rolling mill for hot-rolling and cold-rolling of flat products in one or more roll stands each having two or more rolls, wherein the roll gaps are regulated so as to correct the differential force between the drive side and the operator side of the roll stands, while compensating the adjustment value-controlled regulation of the roll gaps which corrects the bending and balancing forces.
2. Description of the Related Art
The present invention makes it possible, by utilizing the corrected differential rolling force and using the cross modulus for a pivoting regulation, to maintain the roll gap contour over the strip width independently of the strip position and the force distribution and, in addition, the present invention makes it possible after a roll change for effecting calibration to regulate the compensated differential rolling force toward zero after the rolls have been placed one top of the other.
In accordance with another feature of the present invention, the measurement of the forces in the individual work rolls can be effected by force pickups which are mounted in the supports of the rolls, and the measurement of the axial forces can be effected by measuring the hydraulic pressures in those rolls which are pulled hydraulically, possibly by actual force value pickups arranged in the bearing housings of the roll bearings.
By measuring the axial forces of all rolls of each roll stand, the individual force pairs are determined in dependence on the actual roll diameters. The occurring differential roll force is computed on-line from the sums of the force pairs. By interlinking with the cross modulus, compensation values for the adjustment systems are determined and utilized for compensating the measured roll forces on the drive side and the operator side.