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Method for forecasting transient state temperature field with S type step length changing method in the process of plate belt hot rolling

A technology of transient temperature field and hot rolling process, applied in the field of rolling, can solve problems such as slow calculation speed, calculation time and calculation accuracy cannot be satisfied at the same time

Inactive Publication Date: 2008-05-14
NORTHEASTERN UNIV
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Problems solved by technology

[0003] In order to overcome the shortcomings of the above-mentioned method that the calculation speed is slow, the calculation time and the calculation accuracy cannot be satisfied at the same time, the present invention proposes a method for predicting the transient temperature field with an S-type variable step size method, the purpose of which is to ensure the temperature prediction accuracy of the strip. Reduce calculation time and improve calculation efficiency

Method used

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  • Method for forecasting transient state temperature field with S type step length changing method in the process of plate belt hot rolling
  • Method for forecasting transient state temperature field with S type step length changing method in the process of plate belt hot rolling
  • Method for forecasting transient state temperature field with S type step length changing method in the process of plate belt hot rolling

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Experimental program
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Embodiment Construction

[0075] The temperature change of a hot-rolled slab from the furnace to the air-cooling process before dephosphorization is selected for prediction and analysis, and the effects of the fixed step method and variable step method on the calculation results and calculation time of the slab temperature are compared.

[0076] Example: Calculation conditions see Table 1

[0077] Table 1

[0078] Thermophysical parameters

[0079] Four groups of schemes are calculated and analyzed, and the unit division, fixed time step and variable step size of each scheme are as follows:

[0080] Plan 1 unit division: 20×10; fixed time step: Δt=1s; variable step setting: a=10.0, b=9.0, c=0.0001, d=2.5

[0081] Plan 2 unit division: 30×10, fixed time step Δt=1s; variable step setting: a=10.0, b=9.0, c=0.001, d=2.5

[0082] Plan 3 unit is divided into 40×20, fixed time step Δt=0.5s; variable step setting: a=15.0, b=14.5, c=0.0001, d=2.5

[0083] Plan 4 unit is divided into 50×20, fixed ti...

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Abstract

The invention relates to a method of forecasting transient temperature field by using S-shaped variable stepwise during slab band hot rolling process, and the time step mathematical model of the S-shaped variable stepwise is: Delta t equals to a-b*exp(-c*t). By using the S-shaped variable stepwise to carry out transient temperature field finite element solving, not only calculating precision is improved and the design requirement of primary temperature field is satisfied, but also calculating time is greatly shortened. The method solves the problems of low calculation precision and slow speed and improves calculating efficiency when solving the transient temperature field by using finite element method.

Description

technical field [0001] The invention belongs to the technical field of rolling, and in particular relates to a method for predicting a transient temperature field by an S-type variable step-length method in a strip hot rolling process. Background technique [0002] In the hot strip rolling process, from the slab out of the furnace to the end of laminar cooling, the calculation of the transient temperature field distribution of the rolled piece has an important impact on the microstructure evolution, mechanical properties and shape of the rolled piece during the rolling process. In the past, field tests and mathematical models were often used for determination. Due to the influence of actual conditions and model limitations, the temperature prediction accuracy and temperature distribution information were reduced. As an effective numerical analysis method, the finite element method has become an important means to predict the transient temperature field of the slab air coolin...

Claims

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Application Information

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IPC IPC(8): G06F17/50
Inventor 梅瑞斌李长生刘相华
Owner NORTHEASTERN UNIV
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