Temperature drop model of packaging steel strip finishing mill

Temperature Drop Model of Finishing Rolling Mill for Packaging Steel Strip
The discussion of 　　 temperature model will focus on the prediction of the rolling temperature of each stand of the finishing mill and the finishing temperature of the finishing rolling. This is because:
　　 (1) The temperature of each frame of the finishing mill directly affects the thickness and shape of the plate.
　　 (2) On the one hand, the temperature at the exit of the finishing mill is the main parameter that affects the coiling temperature control. On the other hand, the comparison between the prediction of the finish rolling exit temperature and the actual measured value is the main basis for the self-learning of the finish rolling temperature model.
　　 The various temperature drop models discussed in this section can also be used to calculate the temperature of each pass of rough rolling.
　　 The temperature drop of hot rolled strip in each stage of the production process needs to use the basic formulas of heat transfer-radiation, convection, conduction-to derive the calculation formula from the heat balance. The surface temperature change during the production process can be described by a combination of some 'basic heat exchange links'. For thick billets or thicker strip steel, the internal temperature field of the rolling piece needs to be calculated, mainly the temperature change along the thickness direction. From this, the average temperature of the rolling stock is calculated.
　　The temperature drop process of the hot strip mill can be summarized into the following four basic links:
　　 (1) The radiation temperature drop in the air when the strip steel (steel billet, strip billet) is conveyed on the roller table or between the racks;
　　 (2) Temperature drop during high-pressure water descaling;
　　 (3) The temperature drop when spraying water or laminar cooling between racks;
　　 (4) The change of strip temperature during rolling in the stand.
　　 Taking the finishing mill as an example, the temperature drop equation of each basic heat transfer link is derived as follows.