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In order to understand and reduce the problems of camber in the hot strip mill, it is important to be able to measure it accurately. However, up until now a suitable instrument was not available on the market. Sollac Dunkirk (pilot plant) together with IRSID and EES, decided to develop and test a trial online system in the roughing mill, with financial support from ECSC.

By means of a simulator developed by IRSID, it was possible to first make theoretical comparisons showing the advantages and disadvantages between existing and possible solutions of the following: type of defect, disturbances at the mill stand, type of algorithm used and the structure of the gauge. This revealed that the accuracy of existing camber gauges are highly dependent on the alignment of the three sensors. By contrast, in our case, a solution using only two sensors provided the required accuracy at a lower cost (equipment and installation). These results were confirmed in a comparative study between
- measurements recorded by the pilot gauge in Dunkirk; and
- hand measurements made directly on the product. The results gave a standard deviation of less than 6 mm. A patent now protects this principle of measurement.

This camber gauge is now industrialised and based on two EES width gauges. It can be used on other roughing mills and possibly other applications. The first phase of measurements have proven the usefulness of the gauge by showing the relationship between camber and poor thickness profile, cracking, cobbles and coiling quality.

Additional information

Authors: PIOT J P, Sollac Dunkerque, Dunkerque (FR);TONNON E, IRSID, Maizières-lès-Metz (FR);DOWDEY B, EES, Christchurch (GB)
Bibliographic Reference: EUR 20644 EN (2003), 100pp. Euro: 15
Availability: EUR-OP reference: KI-NA-20644-EN-S Available from EUR-OP sales agents URL:
ISBN: ISBN: 92-894-5328-1
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