Process and device for controlling the flatness of a cold-rolled metal sheet
AssigneeUnion Siderurgique du Nord et de l'Est de la France (USINOR)
InventorsPierre M. Cabaret, Maurice B. Daboust, Pierre R. Engerran
Life of this patent
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Abstract
A process for controlling the flatness of a metal sheet subjected to a cold-rolling operation by the measurement of the tensions in different regions of the width of the sheet. There are at least three regions. The process comprises calculating the sum of the tensions measured in the respective regions, calculating from the result obtained the theoretical tension in each region corresponding to a tension uniformly distributed along the width of the sheet, comparing said theoretical tension with the tension effectively measured in the corresponding region and exerting, if required, the required correcting actions as a function of the results of said comparison.
Claims23
A process for controlling the flatness of a moving metal sheet subjected to a cold-rolling operation, comprising measuring tensions in different regions of the width of the sheet by means of coaxial substantially adjoining rollers which engage the sheet and extend transversely of the direction of movement of the sheet, said regions being at least three in number with a corresponding number of said rollers, calculating the sum of the tensions measured in the respective regions by said rollers, calculating from the result obtained the theoretical tension in each region by taking into account an axial extent to which the sheet engages each roller so that said theoretical tension corresponds to a tension uniformly distributed along the width of the sheet, comparing said theoretical tension with the tension effectively measured in each region and exerting, if required, correcting actions on the sheet as a function of the results of said comparison.
A device for controlling the flatness of a metal sheet travelling under tension in a plane in a cold-rolling mill by measurement of tensions in different regions of the width of the sheet, comprising coaxial thrust rollers which are disposed transversely of the direction of travel of the sheet and positioned to deflect the sheet away from said plane, force measuring means associated with said rollers for measuring forces exerted in a direction substantially perpendicular to said plane by the sheet on each of said rollers, and calculating means connected to the measuring means for calculating the sum of the forces exerted on the rollers, said rollers being at least three in number and being in substantially adjoining relation to each other so that the sum of the forces measured by the measuring means is substantially representative of the total tension exerted on the sheet.
A device for controlling in a cold-rolling mill the flatness of a metal sheet by measurement of the tensions in different regions of the width of the sheet, comprising three coaxial thrust rollers which comprise a centre roller and two lateral rollers and are disposed transversely of the direction of travel of the sheet for measuring said tensions in said different regions and force measuring means associated with said rollers for measuring the forces exerted by the sheet on each of said rollers, said rollers being in substantially adjoining relation to each other so that the sum of the forces measured by the respective rollers is substantially representative of the total tension exerted on the sheet, a shaft element which extends through the lateral rollers and has two end portions which extend beyond the lateral rollers, two supports respectively supporting the two end portions beyond the lateral rollers, a girder rigid with a frame of the rolling mill and a force sensor interposed between each support and the girder, the supports bearing on the girder through the respective force sensors.
A device for controlling the flatness of a metal sheet travelling under tension in a plane in a cold-rolling mill by measurement of tensions in different regions of the width of the sheet, comprising a series of coaxial thrust rollers which are disposed transversely of the direction of travel of the sheet and positioned to deflect the sheet away from said plane, said rollers including a centre roller and at least one pair of lateral rollers respectively located adjacent opposite ends of the centre roller, the rollers being in axially substantially adjoining relation to each other, a first shaft element, mounting means rotatably mounting the centre roller on the first shaft element, at least one further shaft element coaxial with the first shaft element, mounting means rotatably mounting said at least one pair of lateral rollers on said at least one further shaft element, a clearance being provided between the shaft elements and clearance being provided between one of said mounting means and one of said shaft elements whereby the shaft elements are free to move radially of the axis of the shaft elements, two first supports for respectively supporting opposite ends of the first shaft element, two further supports for respectively supporting opposite ends of said at least one further shaft element, a girder rigid with a frame of the rolling mill and a force sensor interposed between each support and the girder, the supports bearing on the girder through the respective force sensors.
A device for controlling the flatness of a metal sheet travelling under tension in a plane in a cold-rolling mill by measurement of tensions in different regions of the width of the sheet, comprising a series of coaxial thrust rollers which are disposed transversely of the direction of travel of the sheet and positioned to deflect the sheet away from said plane, said rollers including a centre roller and at least one pair of lateral rollers respectively located adjacent opposite ends of the centre roller, the rollers being in axially substantially adjoining relation to each other, a hollow outer shaft element and as many inner shaft elements as there are pairs of lateral rollers located adjacent opposite ends of the centre roller, means rotatably mounting the centre roller on the outer shaft element, means rotatably mounting the at least one pair of lateral rollers on the respective inner shaft element, said means rotatably mounting the at least one pair of lateral rollers on the respective inner shaft element freely extending through apertures in the outer first shaft element, the inner shaft element pertaining to outermost rollers of said series of rollers being of the smallest cross-sectional size whereas the outer shaft element is of the largest cross-sectional size, clearance being provided between the shaft elements to allow freedom of radial movement of each shaft element, two first supports for respectively supporting opposite ends of the outer shaft element, two second supports for respectively supporting opposite ends of the inner shaft element pertaining to said at least one pair of lateral rollers, the supports pertaining to said outer shaft element being nearer to the centre roller than the supports pertaining to the innermost shaft elements, a girder rigid with a frame of the rolling mill and a force sensor interposed between each support and the girder, the supports bearing on the girder through the respective force sensors.
Dependencies are inferred from the claim text.