Hot rolled wide strip - a differential stress measuring . system for on line measuring and controlling flatness

摘要

The flatness of rolled steel strips is an important attribute ofquality. The production of flat cold rolled strips depends upon theflatness and profile of the corresponding hot strips.Therefore controlled rolling of flat hot strips is very important.The main condition is an on-line-flatness-measuring system, workingover the full length of the strip.The Hoesch Huttenwerke AG, Dortmund, Germany, developed such a newzmethod and a corresponding installation.At first this device has to measure the stress distribution of hot strips in the finishing train of a hot strip mill. Second it has to give characteristic control-data for rolling a hot strip which is flat over it's full length.The installations were working during a period of a year; that means during the rolling of about 3.000.000 t hot strips. This long time of reliable and correct operation shows the good adaption to the difficult environment.All measured data of this measuring device are scanned by a computer controlled data-logger.The resulting curves are given on a video display to the mill operator. He can correct the screw down position or the load distribution.In the started research program the correlations between the set up data of the mill and the various stress distributions are obtained. Details are discussed.