Research of temperature change of the roll after dumping from the stand

At present, with the increasing demand for steel, strict requirements for the quality of the hot-rolled steel increase greatly. One of important criteria of the quality of the finished steel is a transverse profile. Currently, there are a number of promising methods of regulating the transverse profile. One of such technologies is the application of an axial shift of working rolls in CVC stands. A transverse strip profile is formed in finishing stands of the hot rolling mill during compression. Therefore, obtaining of the desired profile depends on the precision of the profiling of working rolls, as well as on the automatic control system of profiles and flatness (PFC). Many factors influence the PFC system, one of which is a thermal profile of the roll which changes the shape of the roll gap during rolling and, consequently, influences the transverse profile of hot strip. To account for this effect it is necessary to understand characteristics of the thermal state of rolls. The paper presents the results of the experimental study of the temperature change of the roll after dumping from the stand which was carried out in the current production. Data obtained on the basis of mathematical modeling and experimental studies yielded regression equations that determine the stand temperature difference along the length of the roll body at any time after dumping. Regression dependences can find application in the optimization algorithm for the initial mill setting to correct the position of the axial shift of working rolls, depending on the residual temperature of the rolls at the time of charging.