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Assuring uniform thickness in steel strips is of particular concern to both hot and cold rolling mill operators, as a result of an increasingly demanding clientèle. Cold-lamination causes thinning of the lips. The types of steel affected are: The adjustment and perfecting of the activators, which are translatable bevelled cylinders, is linked to techniques of on-line measurement. At present measuring the thickness of a cross-section produces unsatisfactory results. Describing the thinning of lips requires a transverse resolution accurate to a millimetre, a measurement to the extremity of the lip, and a synchronous measurement for the entire cross-section. Measurement is based on the use of detectors with bars of X-Ray-sensitive photodiodes. A special detector was developed for metrological uses. The measurement system takes a thickness measurement for adjusting the rolling mill and a profile for each lip. The detectors are placed under the sheet and two X-Ray generators are placed above each detector. Th 384 photosensitive elements are read synchronously to describe a real cross-section. Each photosensitive element is treated as an individual gauge of thickness. The operators can see the profile of lip, and the thickness measurement, on a screen. These data are synthesized and transmitted to the process calculator.

Additional information

Authors: JANCZAK D, Sollac (FR);CAMPRAS JJ, Sollac (FR);TERREAUX S, Sollac (FR)
Bibliographic Reference: EUR 18507 FR (1998) 64pp.
Availability: Available from OOPEC Sales agents
ISBN: ISBN 92-828-4727-6
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