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Pre-calculation method for controlled cooling of thick plate after rolling

A technology of controlled cooling and pre-calculation, applied in metal rolling, metal rolling, manufacturing tools, etc., can solve problems that do not involve the pre-calculation method of the thick plate cooling system

Inactive Publication Date: 2011-01-05
BAOSHAN IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] According to the existing patents, none of the above patents involves the pre-calculation method of the thick plate on-line control cooling system

Method used

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  • Pre-calculation method for controlled cooling of thick plate after rolling
  • Pre-calculation method for controlled cooling of thick plate after rolling
  • Pre-calculation method for controlled cooling of thick plate after rolling

Examples

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Embodiment Construction

[0074] Below with the help of figure 1 To Fig. 9 further illustrate the present invention:

[0075] Such as figure 1 , figure 2 As shown, there are 15 sets of headers in the water cooling area of ​​a medium and thick plate accelerated cooling production line. where T p1 for P 1 Point temperature measurement; T p2 for P 2 Point temperature measurement; T p3 for P 3 Point temperature measurement; T p4 for P 4 point temperature measurement. In thick plate with P 2 and P 4 As the boundary, the upper and lower surfaces of the steel plate are used as the upper and lower boundaries. Matter flows from left to right, and the arrows indicate the direction of energy flow.

[0076] Such as figure 2 As shown, the spacing between each set of headers is 1.6 meters, the coordinates of the entrance of the cooling zone are 65.48 meters, and the coordinates of the first laminar flow header are 71.88 meters. Temperature detector P 2 The distance from the first set of headers ...

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Abstract

The invention discloses a pre-calculation method for the controlled cooling of a thick plate after rolling. The pre-calculation method comprises the following steps of: (1) initializing to obtain the thickness d of a steel plate, steel grade information and components and measuring to obtain temperature Tw of current cooling water; (2) figuring out the number Nh of opening valves and a set value v0 of average speed of the steel plate by using a formula; (3) selecting cooling water flow Q0 and setting k to be equal to 1 and Q(k) to be equal to Q0; (4) solving formulas (4) to (7) by using the initializing information and factors in the step (1), the control parameter v0 obtained in the step (2) and the flow Q(k) in the step (3), figuring out the cooling temperature of the steel plate at an initial temperature after time t to obtain cooling temperature of the steel plate T'e, and setting that if an absolute value of eCR is less than epsilon and epsilon is less than or equal to 0.0001, Q0 is equal to Q(k) and calculation ends, and otherwise, the next step is proceeded to; (5) setting k to be equal to k plus 1, wherein alpha is larger than 0 and less than 1 and is a weight factor, and transferring to the step (4); and (6) figuring out a position-temperature curve set value. The invention can be popularized to all steel plants at home and abroad for pre-calculation in controlled cooling of medium and heavy plates after rolling and has good promotion and application potentials.

Description

technical field [0001] The invention relates to a precalculation method for controlled cooling after plate rolling, in particular to a precalculation method for controlled cooling after thick plate rolling. Background technique [0002] The control system of the post-rolling cooling process of thick plates is generally divided into two layers. The upper layer is the supervisory control layer. According to the requirements of the control objectives, the set values ​​of the control variables such as the cooling water flow density and the speed of the roller table required to cool each steel plate are given in advance. . The bottom layer is the field loop control layer, which performs real-time dynamic control of each bottom loop according to the set value. The supervisory control part of the upper layer can also be called the pre-computation part. [0003] In the cooling process after thick plate rolling, in addition to the control variables such as cooling water flow, rolle...

Claims

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Application Information

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IPC IPC(8): B21B45/02
Inventor 吴扣根刘晔王笑波贺达伦
Owner BAOSHAN IRON & STEEL CO LTD
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