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Method for predicting strip surface coefficients of heat transfer in hot rolling procedures

A technology of surface heat transfer coefficient and hot rolling process, which is applied in the fields of electrical digital data processing, special data processing applications, instruments, etc., and can solve the problems of low precision and lack of professionalism.

Active Publication Date: 2014-04-30
NORTHEASTERN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to provide a method for predicting the heat transfer coefficient of the strip surface in the hot rolling process in view of the shortcomings of low precision and weak professionalism of various methods for predicting the heat transfer coefficient of the strip surface in the hot rolling process in the prior art

Method used

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  • Method for predicting strip surface coefficients of heat transfer in hot rolling procedures
  • Method for predicting strip surface coefficients of heat transfer in hot rolling procedures
  • Method for predicting strip surface coefficients of heat transfer in hot rolling procedures

Examples

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example 1

[0135] Example 1: 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.

[0136] Example: See Table 1 for calculation conditions.

[0137] Table 1 Calculation conditions

[0138]

[0139]

example 2

[0140] Example 2: In the entire hot continuous rolling process, there are 15 rolling passes in total, and the exit thickness and rolling pressure of each rolling pass are shown in Table 2.

[0141] Table 2 Pass outlet thickness

[0142]

[0143] Using the calculation conditions in Table 1 and the exit thickness and rolling pressure in Table 2, the change rule of the heat transfer coefficient of the strip surface during the hot rolling process in a certain steel plant is predicted. Calculated as image 3 and Figure 4 ,in image 3 is the heat transfer coefficient change in the process from the furnace to the exit of the rough rolling; Figure 4 It is the change of heat transfer coefficient in the process from the exit of rough rolling to the exit of finish rolling. It can be seen that the heat transfer coefficient of the air cooling process is basically similar, about 80 (W / m 2. K), the heat transfer coefficient of the descaling process is about 1.25×10 4 (W / m 2. K), ...

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Abstract

The invention discloses a method for predicting strip surface coefficients of heat transfer in hot rolling procedures. The method includes predicting strip surface coefficients of heat transfer by the aid of a finite-element model and heat transfer modifier formulas; determining the strip surface coefficients of heat transfer according to comparison values of measured temperatures and computed temperatures of strips. The method has the advantages that the method is specially used for predicting the strip surface coefficients of heat transfer in the strip hot rolling procedures, change of the strip surface coefficients of heat transfer in the integral rolling procedures can be acquired, information is detailed and accurate, the strip surface coefficients of heat transfer are high in prediction precision, and setting and optimizing parameters can be provided for the rolling procedures; the method is high in applicability and computational efficiency and is applicable to roughing mills and finishing mills in hot continuous rolling procedures.

Description

technical field [0001] The invention belongs to the technical field of rolling, and in particular relates to a method for predicting surface heat transfer coefficient in the hot rolling process of strips. Background technique [0002] The heat transfer coefficient prediction of the strip surface during the hot strip rolling process is an important parameter to realize the optimization of process parameters, the research of cooling device characteristics, the precise control of temperature field and the improvement of product quality. During the hot rolling process, the strip undergoes air cooling process, water cooling process and rolling contact process, so the surface heat transfer coefficient is closely related to the ambient temperature, cooling medium characteristics, cooling method, steel plate state and process parameters, etc., adding surface heat transfer coefficient prediction and measurement difficulty. [0003] At present, the heat transfer coefficient of hot ro...

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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