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Method for improving control precision of coiling temperature

A technology for controlling precision and coiling temperature, applied in temperature control, metal rolling, manufacturing tools, etc., can solve the problem of frequent changes in product types, inability to simultaneously satisfy coiling temperature control precision and mechanical performance stability, and inability to adjust headers Water flow and other issues to achieve the effect of improving the coiling temperature control accuracy, reducing temperature fluctuations, and stabilizing the control system and model

Active Publication Date: 2011-08-31
BEIJING SHOUGANG CO LTD
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Problems solved by technology

[0006] The purpose of the present invention is to provide a method for improving the accuracy of coiling temperature control, which solves the problem that the equal water flow rate of each group of headers cannot meet the high requirements of coiling temperature control accuracy and mechanical performance stability of different products, and also solves the problem of product The type changes frequently, and the water flow of the header cannot be adjusted frequently according to the product type, which stabilizes the control system and model

Method used

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  • Method for improving control precision of coiling temperature
  • Method for improving control precision of coiling temperature
  • Method for improving control precision of coiling temperature

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Embodiment Construction

[0026] Taking silicon steel BWG with a thickness of 2.5mm as an example, the laminar flow cooling control system divides the strip steel into about 200 sections. The water volume of the pipe is 90m 3 / h, the water volume of the upper and lower headers of feedback control 21 and 22 is 47m 3 / h, there is a phenomenon that the coiling temperature of a certain section drops rapidly with the increase of the number of opened headers, such as figure 2 As shown, the standard deviation of the strip full-length coiling temperature is equal to 8.4.

[0027] After configuring the water volume of each group of headers according to Table 1 and using the strategy of spraying water from the 11th group of headers, the feedforward control of the water volume of the 11-16 groups of upper headers is 80m 3 / h, the water volume of the header on the feedback control 21 and 22 is 35m 3 / h, feed-forward control 11-16 groups of lower header water volume 90m 3 / h, feedback control 21, 22 sets of lo...

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Abstract

The invention discloses a method for improving control precision of a coiling temperature, and belongs to the technical field of laminar cooling of hot rolled strips. Following parameters are controlled in a process: setting water flow of each group of collecting pipes in a progressive decreasing way along a rolled direction; selecting cooling strategies, wherein the cooling strategies are storedin an online database, and are automatically selected by a control system according to types and specifications of steel; proportioning heat transfer coefficients: proportioning different heat transfer coefficients aiming at the water quantity of cold water of 1-22 groups of different layers and 1-22 groups of the upper and lower collecting pipes respectively, wherein the heat transfer coefficients are arranged in a range of 0.85-1.25 respectively. The invention has the advantages of improving the control precision of the coiling temperature under the condition of guaranteeing front section primary cold capacity.

Description

technical field [0001] The invention belongs to the technical field of laminar flow cooling of hot-rolled strip steel, and particularly provides a method for improving the control precision of coiling temperature. Background technique [0002] In the production process of hot-rolled strip steel, it is necessary to use a laminar flow cooling device to cool the strip steel after rolling and before coiling, and to obtain ideal metallographic structure and mechanical properties by controlling the coiling temperature and cooling rate of the strip steel . [0003] There are 22 groups of headers in the laminar flow cooling area of ​​conventional hot-rolled strip steel, which are divided into rough cooling area and fine cooling area. Groups 1 to 20 are rough cooling areas, and each group includes 4 upper headers and 4 lower headers; 21 22 groups are fine cooling areas, each group includes 8 upper headers and 8 lower headers, each header is controlled by a separate on / off valve, the...

Claims

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Application Information

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IPC IPC(8): B21B37/74B21B45/02
CPCY02P70/10
Inventor 王淑志江潇董佳彬余威李彬周阳刘志民李金宝
Owner BEIJING SHOUGANG CO LTD
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