Online control method for finish rolling temperature of precision rolling strip steel

A technology of finish rolling temperature and control method, which is applied in the direction of temperature control, etc., and can solve problems such as temperature fluctuation of strip steel, increase of plastic deformation heat, and inability to meet on-site control requirements

Active Publication Date: 2016-02-24
BEIJING SHOUGANG AUTOMATION INFORMATION TECH
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

The former is easy to control the full-length temperature of the strip and has good uniformity, but because the increase in speed not only reduces heat loss, but also increases the heat of plastic deformation, so if the speed rises too fast, the temperature of the strip will be too high to meet the control requirements , resulting in the inability to increase the rolling speed, which affects the improvement of the rolling rhythm, and the stabil

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  • Online control method for finish rolling temperature of precision rolling strip steel
  • Online control method for finish rolling temperature of precision rolling strip steel
  • Online control method for finish rolling temperature of precision rolling strip steel

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Embodiment Construction

[0066] The embodiment of the present invention provides an on-line control method for the finish rolling temperature of the finished strip, using the actual process data and using the quadratic programming optimization algorithm to optimize the second flow adjustment amount of each control point or the cooling water amount adjustment amount between stands , used in the field of rolling process temperature control. The steel grade SDC01 is selected, the specification is 3.5*1270mm, and the cooling water between the stands is used to adjust the temperature control strategy of the final rolling as an example. The process parameters are shown in Table 1 and explained as follows.

[0067] Table 1 Process parameters of each pass of finish rolling

[0068]

[0069] 1) The strip generates several control points according to the control cycle in the length direction, such as figure 1 shown;

[0070] 2) According to the information of each control point and the measured value of th...

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Abstract

The invention discloses an online control method for the finish rolling temperature of precision rolling strip steel and belongs to the field of temperature control of rolling processes. The second flow regulating variable or the cooling water flow regulating variable between machine frames is subjected to online optimization through a quadratic programming optimization algorithm, and the deviation between a calculated value and a target value of the finish rolling temperature is reduced. The method comprises the steps that a plurality of control points are generated on the strip steel in the length direction according to a control period; the deviation between the calculated value and the measured value of the finish rolling temperature of all the control points is calculated according to information of all the control points and the measured value of a pyrometer at a precision rolling outlet; a temperature calculating model is corrected according to the deviation, and the calculation precision is improved, at the same time, the deviation between the calculated value and the target value of the finish rolling temperature of all the control points is calculated; and according to the deviation value between the temperature calculated value and the target value, the second flow regulating variable or the cooling water flow regulating variable between the machine frames of all the control points is subjected to online optimization through the quadratic programming optimization algorithm, and the finish rolling temperatures of all the control points are made to meet the control requirements. By means of the method, the control precision of the finish rolling temperature of the strip steel is improved, the uniformity of the total-length temperature of the strip steel is guaranteed, and the finished product quality requirements are met.

Description

technical field [0001] The invention belongs to the field of temperature control in the rolling process, and in particular relates to an on-line control method for the finish rolling temperature of finished strip steel. Background technique [0002] Finishing temperature is an important parameter for the quality control of hot-rolled strip steel, which not only affects the deformation resistance and other rolling parameters of the rolled strip steel, but also affects the metallographic structure, mechanical properties and dimensional accuracy of the finished strip steel after rolling. Therefore, in order to meet the quality requirements of the finished strip steel, it is necessary not only to make the head of the strip steel reach the target temperature, but also to ensure the uniformity of the final rolling temperature of the strip steel throughout the length, so as to meet the requirements of the microstructure performance and dimensional accuracy of the strip steel through...

Claims

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Application Information

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IPC IPC(8): B21B37/74B21B37/76
CPCB21B37/74B21B37/76
Inventor 王海玉赵强王淑志高雷江潇龚彩军唐婧
Owner BEIJING SHOUGANG AUTOMATION INFORMATION TECH
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