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High-precision prediction method for average temperature of intermediate billet of wide and thick plate

A technology of average temperature and prediction method, applied in temperature control, design optimization/simulation, computer-aided design, etc., can solve the problem that the preset roll gap deviates from the thickness control benchmark, the force-energy model deviates from the actual value, and the finished product rolling cannot be completed and other problems to achieve the effect of improving prediction accuracy, increasing the hit rate of final rolling, and reducing quality objections

Active Publication Date: 2022-05-13
NANJING IRON & STEEL CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The traditional temperature model considers the boundary conditions of air cooling, rolling and high-pressure water descaling in the process of temperature prediction. The prediction results of the temperature model will gradually affect the actual value of the rolled piece temperature, causing the prediction of the force-energy model to deviate from the actual value
[0003] The second rolling start temperature of the intermediate billet for wide and thick plates is the key to determine the subsequent rolling schedule. If the temperature deviation is too large, the preset roll gap will deviate from the thickness control benchmark, and even the rolling force will exceed the limit and the finished product cannot be rolled.

Method used

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  • High-precision prediction method for average temperature of intermediate billet of wide and thick plate
  • High-precision prediction method for average temperature of intermediate billet of wide and thick plate
  • High-precision prediction method for average temperature of intermediate billet of wide and thick plate

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Embodiment Construction

[0047] A high-precision prediction method for the average temperature of a wide-thick slab intermediate blank provided in this embodiment includes the following steps:

[0048] (1) The implicit finite difference method is used to solve the temperature field

[0049] For the temperature drop process of the intermediate slab of wide and thick slabs, the heat dissipation in the length and width directions is ignored, and the heat transfer process is regarded as a one-dimensional heat transfer process along the thickness direction of the billet, and the heat conduction differential equation without considering the internal heat source is expressed by formula ①

[0050]

[0051] In the formula, α=k / (ρc) is the temperature conductivity coefficient, ρ is the material density, c is the specific heat, and k is the thermal conductivity coefficient;

[0052] For a given heat transfer coefficient and the temperature boundary condition of the surrounding medium, the form is:

[0053] ...

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Abstract

The invention discloses a high-precision prediction method for the average temperature of intermediate billets of wide and thick plates, and relates to the technical field of steel production. Based on a temperature partial differential equation, an implicit finite difference method is adopted to establish a temperature solving equation set of the wide and thick plates, and temperature fields in the temperature waiting process of the intermediate billets with different thicknesses are calculated; temperature distribution in the thickness direction under the condition of stable temperature is obtained, and then the difference value between the surface temperature and the average temperature is obtained; due to the fact that the mechanism model is adopted to calculate the temperature field, the temperature calculation precision can be guaranteed, meanwhile, regression processing is carried out on the calculation result, the average temperature of the steel billet can be rapidly calculated according to the surface temperature value of the steel billet, and the engineering application requirement is met.

Description

technical field [0001] The invention relates to the technical field of iron and steel production, in particular to a high-precision prediction method for the average temperature of an intermediate billet of a wide and thick plate. Background technique [0002] During the hot rolling of wide and thick plates, the temperature of the rolled piece determines the deformation resistance of the metal, and is a sensitive factor affecting the mechanical parameters such as rolling force, moment, and power. The temperature control accuracy of the intermediate billet is very important for the distribution of regulations and the performance of products. . The traditional temperature model considers the boundary conditions of air cooling, rolling and high-pressure water descaling in the process of temperature prediction. The prediction results of the temperature model will gradually affect the actual value of the rolled piece temperature, causing the prediction of the force-energy model ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21B37/74B21B1/22G06F30/23G06F17/12G06F17/18G06F119/08
CPCB21B37/74B21B1/22G06F30/23G06F17/12G06F17/18G06F2119/08Y02P90/30
Inventor 滕达何纯玉邱保文樊卫刘明孙旭东
Owner NANJING IRON & STEEL CO LTD
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