Ims Messsysteme Gmbh

Paul Flormann

A method for determining the flatness of a material strip and a device for performing the method. The method and device solve the technical problem of calculating the strip elongation from values of the strip contour and thus determining the flatness of the material strip. This problem is solved according to the present invention by a method in which, from the changes of slope values measured at a plurality of measurement points, the wavelength and phase of these changes are calculated. Therefrom there is calculated the position of at least one extremum, at which the measured slope values have only a transverse component. The slopes are summed to calculate a contour, from which the amplitude is calculated. The strip elongation as a measure of the flatness of the material strip is then determined from the wavelength and amplitude.

Method for determining the flatness of a material strip

A process for the determination of the thickness transverse profile and the thickness longitudinal profile of a running material strip. The process includes (a) determining the strip thicknesses in at least two measuring areas, (b) determining the longitudinal position of the thickness longitudinal profile, (c) measuring the strip thickness in the longitudinal position and setting a correction value to be zero, (d) measuring an adjustment setting (&Dgr;P) of the measuring unit for the longitudinal position, (e) calculating the gradient (k) of the strip thicknesses transverse to the direction of travel of the strip, (f) recalculating the correction value (&Dgr;K) from the previous correction values and the product of (k) and (&Dgr;P), (g) calculating the mean strip thickness (D ), (h) calculating the corrected strip thickness in the longitudinal position as the sum of (D ) and (&Dgr;K), (i) repeating steps (d) to (h) within an adjustment movement cycle and (j) determining the thickness transverse profile from the strip thickness and the thickness longitudinal profile from the mean strip thickness.

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Heiligenhaus, Germany

Paul Flormann