Method for improving calculation precision of temperature of intermediate billet in hot rolling

Abstract

The invention provides a method for improving the calculation precision of the temperature of an intermediate billet in hot rolling, belongs to the technical field of hot rolling methods, and is used for improving the calculation precision of the temperature of the intermediate billet by a Siemens second-level model. The technical scheme is as follows: a linear calculation zone is enlarged, the mode of combination of a linear calculation method and an average calculation method is adopted, temperature mantissa is filtered in first-level automation and second-level automation, and the temperature value defaulted by a second-level model is subdivided according to the thickness of a finished band steel, so that the pre-calculation accuracy of finish rolling is greatly improved, the grade number is reduced, and the enterprise benefits are increased. According to the method, the pre-calculation temperature point of the second-level model subjected to finish rolling is calculated by the mode of the combination of the linear calculation method and the average calculation method, the mode is an innovation of the calculation of the pre-calculation temperature points of the second-level model, the influence on the calculation accuracy caused by low temperature point or temperature distortion point can be alleviated, the problem which is not solved for a long time in the industry can be solved, and the obvious effect is achieved.

Description

technical field [0001] The invention relates to a method for improving the calculation accuracy of the head temperature of an intermediate slab head by a Siemens secondary model in hot rolling, and belongs to the technical field of hot rolling methods. Background technique [0002] In the hot rolling process, the quality of the precision indicators such as the final rolling temperature, thickness, and width of the finished strip is related to the given parameters such as the roll gap and speed of the finishing mill. Since there is no closed-loop control for the distance of the strip head from the finishing stand to the entrance of the large-scale instrument for detection (hereinafter referred to as the head), the accuracy control can only be controlled by the preset of the Siemens secondary model , while the Siemens second-level model is based on temperature when setting parameters such as roll gap and speed of the finishing mill. Owing to the iron scale or residual water s...

AI Technical Summary

Problems solved by technology

[0006] The technical problem to be solved by the present invention is a method for improving the calculation accuracy of the head temperature of the hot-rolled intermediate billet. This method adopts a new calculation and comparison method, which can solve the temperature distortion point and the temperature calculation of the head when the temperature upload fails. To ensure the accurate calculation of the head temperature, so that the dimensional accuracy of the finished strip steel is qualified

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