METHOD FOR MEASURING THE FLATNESS OF A METAL PRODUCT AND ASSOCIATED DEVICE
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United States of America Patent
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Nov 8, 2018
app pub date -
Nov 7, 2016
filing date -
Nov 7, 2016
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Abstract
A method and device for measuring the flatness of a metal product traveling on a path. The product has at least plastic or elastoplastic deformation properties. The metal product (1) is in the form of a strip that travels (D) under tension over a flatness measurement assembly (2) that deflects the product, such as at least one measuring roller (RM) that deflects the product. Measure flatness by measuring the longitudinal tension over a deflection zone. Perform the flatness measurement by: a first longitudinal tension measurement value (T1) by the measuring roller, —determining a model of stress over the thickness of the strip as a function of conditions of plastic or elastoplastic deformation of the product, —calculating a correction factor for the longitudinal deformation according to the determined stress model, —calculating a corrective value (T1′, T2′) for the first longitudinal tension measurement value (T1) at at least one evaluation point (M1, M2) as a function of the longitudinal deformation correction factor (Z1), —calculating a corrected flatness measurement value (PC) at at least one of the evaluation points.
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