Method for forecasting finite element of hot rolling process plate belt temperature field

A hot rolling process and finite element technology, applied in the field of rolling, can solve problems such as low precision and low professionalism

Inactive Publication Date: 2008-05-14
NORTHEASTERN UNIV
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  • Abstract
  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Aiming at the disadvantages of low precision and low professionalism of various methods for predicting the temperature field of the strip in the hot rolling process in the prior art, the present invention provides a finite element method

Method used

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  • Method for forecasting finite element of hot rolling process plate belt temperature field
  • Method for forecasting finite element of hot rolling process plate belt temperature field
  • Method for forecasting finite element of hot rolling process plate belt temperature field

Examples

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Embodiment Construction

[0073] The hot rolling process of a steel grade is selected as the calculation object, and the temperature evolution law of the whole process from exiting the heating furnace to finishing rolling is analyzed by using the finite element method.

[0074] Hot continuous rolling process in a steel mill. There are 4 stands in the rough rolling process, and the second stand is a reversible stand; there are 7 stands in the finish rolling process. The reversible stand is rolled 5 times, and the rest of the stands are rolled once.

[0075] Example: See Table 1 for calculation conditions.

[0076] Table 1

[0077] parameter name

value

iterations

Thermal conductivity

specific heat

density

Initial temperature of rolled piece

Roll temperature

ambient temperature

Cooling water temperature

unit division

Rolled piece initial width

Initial thickness of rolled piece

rolling pressure

Phosphate removal water flow

5

...

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Abstract

A finite element method of forecasting slab band temperature field during a hot rolling process belongs to the rolling technique field, and comprises the following steps: (1) collecting rolling process data; (2) carrying out unit division to cross section, establishing finite element analysis model, coding a unit node, and calculating a node coordinate; (3) ensuring border heat transfer coefficient and internal heat source intensity according to different rolling processes; (4) calculating the type-function of quadrangle isoparametric unit, B matrix, Jacobian matrix J and Jacobian matrix determinant |J| by using the finite element basic principle; (5) assembling the temperature rigidity matrix and dynamic heating matrix of the finite unit; (6) solving linear system of equations by adopting unidimensional variable bandwidth storage to obtain transient temperature field. The invention has the advantages that: the invention can obtain very high temperature forecasting precision and detailed information of the entire hot rolling slab band temperature distribution, which provides set and optimized parameter for rolling process, moreover, the invention has strong adaptability, reduces calculating time and improving calculating efficiency.

Description

technical field [0001] The invention belongs to the technical field of rolling, in particular to a finite element method for predicting the temperature field of a strip during hot rolling. Background technique [0002] At present, in the strip hot rolling process, the strip temperature prediction methods mainly include on-site measurement, mathematical model, finite difference method and finite element software simulation. Although the on-site measurement is convenient, it is subject to subjective factors, and most of them can only obtain the surface temperature of the strip, and cannot obtain comprehensive and accurate temperature information; the mathematical model greatly depends on the field test conditions, the calculation method is not flexible enough, and the calculation accuracy is often relatively low Low; the finite difference method is an approximate numerical solution that directly converts a differential problem into an algebraic problem, and its theoretical fla...

Claims

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Application Information

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