A Method for Predicting the Entrance Temperature of Hot Continuous Rolling and Finishing Rolling

Abstract

The invention provides a temperature forecasting method for a finish rolling inlet during hot continuous rolling. The temperature forecasting method comprises the following steps that 1, intermediate transporting roller way parameters and PDI data are obtained; 2, a measured surface temperature average value of a rolled piece at a rough rolling outlet and a measured thickness average value of the rolled piece are obtained; 3, the actual operating speed of the rolled piece and the total operating time of the rolled piece on an intermediate transporting roller way are obtained; 4, the time for the rolled piece to pass the interior of an applied heat preserving cover, the time for the rolled piece to go through the exterior of the heat preserving cover, the time that the lower surface of the rolled piece and the intermediate transporting roller way are in contact and the time that the lower surface of the rolled piece and the external environment are in contact are calculated; 5, the upper surface temperature of the rolled piece and the lower surface temperature of the rolled piece are obtained when the rolled piece reaches the finish rolling inlet; and 6, the temperature of the rolled piece is calculated when the rolled piece reaches the finish rolling inlet during hot continuous rolling. According to the temperature forecasting method for the finish rolling inlet during hot continuous rolling, the temperature of the rolled piece at the finish rolling inlet can be accurately obtained in accordance with the heat exchange situations of the rolled piece during operating on the intermediate transporting roller way and through the surface temperatures measured through a pyrometer at the rough rolling outlet, the application situations of the heat preserving cover, and the thickness and operating speed of the rolled piece.

Description

technical field [0001] The invention belongs to the technical field of steel rolling automatic control, and in particular relates to a method for predicting the inlet temperature of hot continuous rolling and finishing rolling. Background technique [0002] In the process of hot strip rolling, accurate forecasting of the temperature at the entrance of the finishing mill is an important prerequisite for realizing the process control of hot strip rolling. The prediction accuracy of the finish rolling entrance temperature directly affects the prediction accuracy of the deformation resistance model, further affects the prediction of the rolling force model and the bounce model, and plays a decisive role in the thickness control of the finished product. [0003] Oxygen scale will be produced during the roller table transportation between the rough rolling and the finish rolling entrance, which will directly affect the measurement accuracy of the surface temperature of the rolled ...

AI Technical Summary

Problems solved by technology

[0003] Oxygen scale will be produced during the roller table transportation between the rough rolling and the finish rolling entrance, which will directly affect the measurement accuracy of the surface temperature of the rolled piece by the thermometer at the finish rolling entrance; It is also difficult to measure the temperature of the rolled piece; at the same time, due to the influence of the conveying roller table, while the upper and lower surfaces of the rolled piece are undergoing radiation heat exchange, heat conduction will occur between the lower surface of the rolled piece and the conveying roller table; Due to the influence of rolls, the convective heat transfer coefficients on the upper and lower surfaces of the rolled piece are also different, resulting in different temperature drops on the upper and lower surfaces of the rolled piece. In the actual production process, there are certain errors in the method of calculating the average temperature by simply using the upper surface temperature

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