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

A technology of head temperature and calculation accuracy, applied in metal rolling, metal rolling, rolling mill control devices, etc., to achieve the effect of reducing workload, improving accuracy, and reducing the impact of calculation accuracy

Active Publication Date: 2015-12-30
HEBEI IRON AND STEEL
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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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  • Method for improving calculation precision of temperature of intermediate billet in hot rolling
  • Method for improving calculation precision of temperature of intermediate billet in hot rolling

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Embodiment Construction

[0025] The present invention adopts following technical scheme:

[0026] 1. Expand the linear range of the Siemens secondary model to 25% to reduce the impact of low temperature on linear calculation.

[0027] 2. Check the final result of the linear calculation. At the same time as the linear calculation, calculate the average value of the temperature value used in the linear calculation, and then compare the two. If the deviation is greater than 15°C, use the average value algorithm.

[0028] 3. During the automatic first-level and second-level upload process of the Siemens second-level model, the temperature points with a temperature value of "-1" are filtered at the same time, that is, as long as the temperature value val is "-1", the Siemens second-level model is correct It makes a valid judgment and determines that its valid is "0", and the model will not use this value in subsequent linear calculations.

[0029] 4. In the Siemens secondary model, different temperature d...

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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...

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Application Information

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IPC IPC(8): B21B37/16
CPCB21B37/16
Inventor 罗波徐立山程玉君包阔张晓磊陈超
Owner HEBEI IRON AND STEEL
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