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Roughed plate bloom temperature control method in hot-rolled process

A temperature control method and technology for the hot rolling process, which are applied in temperature control, special data processing applications, instruments, etc., and can solve problems such as the correction of model coefficients by region.

Active Publication Date: 2007-07-04
BAOSHAN IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The traditional rough rolling slab temperature calculation model focuses on the final calculation results reaching the rough rolling measurement point, and does not make full use of the actual measurement values ​​of the temperature measuring instruments to correct the model coefficients of the intermediate process in different regions

Method used

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  • Roughed plate bloom temperature control method in hot-rolled process
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  • Roughed plate bloom temperature control method in hot-rolled process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0055] Please refer to Figure 1, the temperature control method includes the following steps:

[0056]a. First, take the temperature distribution when the slab is drawn out from the heating furnace as the starting point, and use the recursive analytical temperature distribution model according to the movement sequence and running time of the slab to obtain the temperature distribution at each point on the slab rolling path ;

[0057] b. Then, compare the average temperature of the slab at the measurement point after the rough rolling obtained in step a with the rough rolling target temperature. If the comparison result is greater than the set allowable value of the difference between the two temperatures, then The entrance temperature of the last pass of rough rolling is used as a reference, the steel is swayed, and the slab is radiated to cool down. If the comparison result is less than the set temperature allowable value, the slab is rolled normally;

[0058] c. Compare the meas...

Embodiment 2

[0163] Please refer to FIG. 2. The steps of this embodiment are specifically described as follows:

[0164] First, obtain the temperature distribution model parameters of the slab drawn from the heating furnace and the data determined by the rolling process, such as slab thickness, slab physical parameters, slab running speed, and water spray mode.

[0165] The recursive analytical model is used to obtain the temperature distribution of the air-cooled radiation of the slab before reaching the scale box. Two parameters are involved in the calculation process, one is the running time of the slab, and the other is the radiation coefficient. They are all definite, because Whether it is an air-cooled zone or a water-cooled zone, its length is known, so the running time of the slab in the corresponding zone can be predicted, and the emissivity is known as a model parameter.

[0166] The slab temperature distribution of the water-cooled convection when the slab passes through the descali...

Embodiment 3

[0170] In the following, in conjunction with Fig. 3 and Fig. 4, the process of correcting the radiation coefficient and the water cooling coefficient by the slab temperature distribution model of the control method of the present invention will be explained.

[0171] After obtaining the relevant data of the passes of the newly rolled steel, such as obtaining the actual water spray status of the racks of each pass, the conveying time of the slabs in each air cooling zone, etc., use the control steps described in the second embodiment to obtain the rack R1 The temperature distribution of the slab at the end of the first zone in the last pass is shown in Figure 4, that is, the temperature distribution of the slab at the position of the temperature measuring instrument between the frame R1 and the frame R2. Using the actual value of rough rolling, the slab temperature distribution is obtained from the heating furnace extraction to the end of the first zone, and the slab surface temper...

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Abstract

The invention discloses a rough roll bar plate temperature control method in operation of heat rolling, the invention mainly uses the temperature when bar plate is pulled out of heating-furnace as start, according to the movement order and o running time of bar plate uses the recursive analytic temperature distribution model to calculating the temperature distribution of each points on the bar plate rolling operation path; and compares the average temperature of the measuring point on the bar plate after rough roll and the rough roll goal temperature, if the compared result is bigger then the permissible value of set temperature contrast of said both parties, then makes the last entrance temperature of rough roll as reference, and controls the temperature of bar plate through swing steel, in addition, makes self-adaptive amendment of the model radiation coefficient and water cooling coefficient in different areas, while according the rough roll goal temperature determines the swing time of bar plate on the middle roll table to controlling the temperature of bar plate accurately and improving the whole control level of rough roll procedure.

Description

Technical field [0001] The invention relates to the forming and processing of hot rolled steel, and more specifically to a method for controlling the temperature of a rough rolled slab during the hot rolling process. Background technique [0002] In hot rolling production, temperature is an extremely important process parameter. Accurately predicting the temperature change of each link is an important prerequisite for realizing computer control of the hot tandem mill. Whether the prediction of rolling temperature is accurate or not, the entire setting is calculated and improved. The dimensional accuracy, plate shape and mechanical properties of the parts are of very important significance and are the core of improving rolling stability. [0003] At present, there are two types of models commonly used in slab temperature control and forecasting calculations, one is a simplified theoretical model, and the other is a difference model. The former type of model is a simplified theoret...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21B37/74G06F17/50
Inventor 吕立华张健民
Owner BAOSHAN IRON & STEEL CO LTD
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