The difference between head and tail of plate rolling process in Variation of the temperature
Temperature prediction and control is an important objective of plate rolling process. Current constraints temperature accuracy is not only related to the temperature model! And closely related to the characteristics of the rolling process. Plate rolling process has two characteristics are closely related to temperature uniformity: First, the thicker the plate thickness, the rolling process longer, the worse the uniformity in the thickness direction; the second is the reversible rolling, since the steel head and tail into the mill time different, causing rolling around its head and tail temperature different boundary conditions such that a temperature difference between head and tail temperature, if the temperature difference is large, will directly affect the setting accuracy and subsequent cooling and performance control.
Northeastern University researchers conducted analysis of plate rolling process portion of the temperature difference between head and tail of variation, based on the characteristics of reversible rolling, to calculate changes in the characteristics of different head and tail rolling pass time and time gap, focusing on the thickness of the head and tail temperature the impact of poor, that, for thin gauge steel, continuous steel rolling process generally does not exceed the temperature difference between head and tail cumulative 7 ℃. For a total of more than 30mm heavy-gauge steel head and tail temperature difference does not exceed 3 ℃. This value is set for the development of the rolling force and TMCP process has little effect, do not need to be considered special. At the same time turn steel processing operations and until the temperature does not deteriorate steel head and tail temperature differences.