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Method for automatically controlling plate shape of continuous annealing leveling mill based on stability index

A tempering machine and stability technology, applied in the direction of contour control, etc., can solve the problems of reducing the shape quality of the finished strip steel plate, and the dynamic effect of the automatic control of the shape is not good, etc.

Active Publication Date: 2012-03-14
BAOSHAN IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0010] The flatness control commissioning engineer sets the slope gain coefficient based on experience or by means of experiments (constant) and bending gain coefficient (constant) will not be modified after the gain coefficient is fixed; although the stability of the continuous annealing tempering machine during the rolling process can be guaranteed after the gain coefficient is fixed, it will not cause strip deviation and strip breakage, but it is easy to cause automatic control of the plate shape. The dynamic effect of the steel plate is not good, thereby reducing the shape quality of the finished strip in the direction of the entire coil length

Method used

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  • Method for automatically controlling plate shape of continuous annealing leveling mill based on stability index
  • Method for automatically controlling plate shape of continuous annealing leveling mill based on stability index
  • Method for automatically controlling plate shape of continuous annealing leveling mill based on stability index

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Effect test

Embodiment 1

[0064] like figure 2 As shown, an automatic control method for continuous annealing and tempering machine shape based on stability index, including the following steps:

[0065] Step 1. Using the five sets of measured flatness data measured by the flatness measuring roller within one control period, performing sliding average processing on the five groups of actually measured flatness data to obtain smooth measured flatness data. The difference between the smoothed measured shape data and the target shape is fitted by the least square method to obtain the shape deviation equation in the form of a quadratic polynomial ,

[0066] (1)

[0067] From the shape deviation equation Obtain the shape deviation coefficient once in , Secondary shape deviation coefficient ;

[0068] Step 2. The control ability of the continuous tempering machine is limited. When the inclination changes from 0 to the limit value (1.0), there is a value corresponding to the cha...

Embodiment 2

[0140] The flatness measurement computer 2 receives the actual flatness signal, performs sliding average processing on the measured flatness signal, and obtains smooth measured flatness data, and then obtains smoothed actual flatness data σ p for:

[0141] σ p ={1.0000, 0.6970, 0.4404, 0.2305, 0.0670, -0.0499, -0.1202, -0.1440, -0.1213, -0.0521,

[0142] 0.0637, 0.2260, 0.4349, 0.6903, 0.9922, 1.3407, 1.7357, 2.1773, 2.6654, 3.2000};

[0143] The target shape σ stored in the shape controller s ={0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0,

[0144] 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0};

[0145] Subtract the target shape from the measured shape data to get the shape deviation

[0146] Δσ p ={1.0000, 0.6970, 0.4404, 0.2305, 0.0670, -0.0499, -0.1202, -0.1440, -0.1213, -0.0521,

[0147] 0.0637, 0.2260, 0.4349, 0.6903, 0.9922, 1.3407, 1.7357, 2.1773, 2.6654, 3.200};

[0148] According to the ...

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Abstract

The invention relates to the field of slab band cold rolling post-treatment, in particular to a method for automatically controlling a plate shape of a continuous annealing leveling mill. A method for automatically controlling a plate shape of a continuous annealing leveling mill based on a stability index is characterized in that the method comprises the following steps of measuring data of an actually measured plate shape with a plate shape measuring roll, obtaining primary and secondary plate shape deviation coefficients alpha 1 and alpha 2; obtaining the basic parameters of a continuous annealing leveling mill through a test; firstly calculating the obtained basic gain coefficient and a stability index, and then calculating the gain coefficient, and finally multiplying the gain coefficient with the plate shape deviation coefficients, obtaining the adjustment quantity of a plate shape executive mechanism of the continuous annealing leveling mill. With the adoption of the method provided by the invention, the gain coefficient is optimized on-line with the change of the plate shape deviation; the stability index is defined in a certain value range, so that the rolling stability of the continuous annealing leveling mill can be ensured and the plate shape quality of the band steel can be improved.

Description

technical field [0001] The invention relates to the field of post-processing of strip cold rolling, in particular to an automatic control method for strip shape of a continuous annealing and tempering machine. Background technique [0002] The shape of the cold-rolled strip is an important quality index of the cold-rolled strip. The shape of the cold-rolled strip directly affects the productivity, yield and cost of downstream industries such as automobiles, home appliances, instruments, and food packaging, as well as the appearance of the product. Therefore, in The strip shape automatic control technology is adopted in the cold rolling production to improve the strip shape quality. [0003] The continuous annealing unit is an important and key processing line in the cold rolling production equipment. It combines the main processes of cold rolling production such as degreasing, annealing furnace, leveling, and finishing to form a continuous and efficient thin plate production...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21B37/28
Inventor 徐江华张宝平李山青王挺张剑鸣
Owner BAOSHAN IRON & STEEL CO LTD
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