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

Abstract

The invention provides a method for predicting the entrance temperature of the hot continuous rolling finishing rolling, obtaining the parameters of the intermediate transport roller table and PDI data; obtaining the average value of the surface temperature of the measured rolling piece and the average thickness of the measured rolling piece at the rough rolling outlet; and obtaining the actual thickness of the rolling piece. Running speed, the total time the rolled piece runs on the intermediate transport roller table; separately calculate the time the rolled piece passes through the thermal insulation cover, the time the rolled piece experiences outside the thermal insulation cover, and the contact time between the lower surface of the rolled piece and the intermediate transport roller table. time and the time of contact with the external environment; obtain the upper surface temperature and upper surface temperature of the rolled piece when it reaches the finishing rolling entrance; calculate the temperature of the rolled piece when it reaches the hot continuous rolling finishing rolling entrance. According to the heat exchange situation of the rolled piece while running on the intermediate transport roller table, the present invention can accurately obtain the finishing rolling entrance through the surface temperature measured by the rough rolling outlet pyrometer and the use of the insulation cover, the thickness of the rolled piece and the running speed. The rolling stock temperature.

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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