Finite element method for on-line board temperature calculation in course of hot rolling

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

Inactive Publication Date: 2008-07-16
NORTHEASTERN UNIV LIAONING
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  • Abstract
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  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to overcome the disadvantages of low accuracy of the traditional temperature calculation method, introduce the finite element method into the strip hot rolling process, and improve the calculation accuracy of temperature

Method used

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  • Finite element method for on-line board temperature calculation in course of hot rolling
  • Finite element method for on-line board temperature calculation in course of hot rolling
  • Finite element method for on-line board temperature calculation in course of hot rolling

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Embodiment Construction

[0091] The process layout of the production of a medium and thick plate is shown in Figure 5.

[0092] The rolling process is as follows: the billet is put into the furnace and heated to the corresponding temperature → out of the furnace for high-pressure water descaling → transported to the rolling mill for forming rolling → widening and rolling after transfer → elongation and rolling after transfer to the final Dimensional requirements → transport to accelerated cooling system for cooling → straightening.

[0093] The above process is for conventional rolling; for the controlled rolling process, its elongation rolling process is divided into two stages: the stage before warming (equivalent to air cooling for a long time) and the post-warming stage. After the rolled piece is rolled to a certain thickness in the pre-warming stage, it is transported to the warming roller table for waiting temperature, gradually cooled to the specified rolling temperature, and then starts rollin...

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Abstract

A finite element method for on-line calculation of slab band temperature during hot rolling belongs to the rolling technical field, and comprises the following steps that: (1) the establishment of a finite element model: unit division of the cross section of a rolling piece is carried out to set up a finite element analysis model; unit node numbering is carried out to calculate nodal coordinate; (2) the determination of parameters during calculation: the data needed during calculation includes initial information, rolling parameters, thermal physical property parameters of material, unit division information, control parameters and heat exchange coefficient; (3) the establishment of finite element solving equations set: through combining spatial domain finite element discretization and time domain finite difference, the solving linear equations set of temperature field finite element is set up; (4) pass rolling starting temperature is calculated; (5) on-line application is carried out. The invention has the advantages that: the invention can obtain high temperature calculation precision and the detailed information of slab band temperature distribution during entire hot rolling, thereby providing set parameters and optimized parameters for the rolling process; meanwhile, with strong practicality, the invention reduces calculation time and improves calculation efficiency; moreover, the invention is suitable for online application and optimization.

Description

technical field [0001] The invention belongs to the technical field of rolling, in particular to a finite element method for online calculation of strip temperature during hot rolling. Background technique [0002] Temperature is one of the most important parameters during rolling. Since the temperature directly affects the rolling force, the accurate prediction of the temperature at each stage in the production process is the key to ensure the control accuracy of thickness, width and shape. The temperature calculation method used in production in the past was either limited by its solution mechanism or oversimplified, it was difficult to adapt to changes in the production environment, and the calculation deviation was large. [0003] As a numerical calculation method, the finite element method can accurately calculate the temperature field of the rolled piece during the rolling process. In the past, due to the limitation of the calculation time of the finite element metho...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G05B13/04G05B19/418
CPCY02P90/02
Inventor 李长生刘刚赵忠刘相华
Owner NORTHEASTERN UNIV LIAONING
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