Grading regulation and control method of high-order flatness defect of ultra-thin cold-rolled strip steel with high width-to-thickness ratio

A high-order shape and cold-rolled strip technology, applied in the direction of contour control, can solve the problems that affect the training time and recognition accuracy, the key parameters are not easy to accurately determine, and the shape signal cannot be truly reflected, so as to improve the quality of the shape , reduce the amount of calculation, improve the effect of stability

Active Publication Date: 2016-02-03
YANSHAN UNIV
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Problems solved by technology

Among them, the plate shape pattern recognition method based on polynomial or least square method is simple or has theoretical defects, and cannot truly reflect the actual plate shape signal; the pattern recognition based on the ordinary neural network model req

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  • Grading regulation and control method of high-order flatness defect of ultra-thin cold-rolled strip steel with high width-to-thickness ratio
  • Grading regulation and control method of high-order flatness defect of ultra-thin cold-rolled strip steel with high width-to-thickness ratio
  • Grading regulation and control method of high-order flatness defect of ultra-thin cold-rolled strip steel with high width-to-thickness ratio

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Embodiment Construction

[0029] Below in conjunction with accompanying drawing and specific embodiment the present invention is described in further detail:

[0030] According to the present invention, a hierarchical control method for local high-order shape defects of ultra-thin cold-rolled steel strips with a large aspect ratio, the basic process of the comprehensive control of the shape is as follows: figure 1 As shown, the method includes the following steps:

[0031]1. Establish a plate shape pattern recognition model based on ultra-high-order Legendre orthogonal polynomials:

[0032] Assuming that the number of effective channels of the plate shape detection roller is m, y∈[-1,1] represents the normalized plate width coordinates, and the origin is located at the center of the plate width, the measured value is expressed as Δσ 1 (y)=[Δσ 1 (-1)Δσ 1 (y i )…Δσ 1 (1)], if the target curve Δσ is known * (y), then the target deviation value Δσ i (y) for

[0033] Δσ i (y) = Δσ 1 (y)-Δσ * (y)(...

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Abstract

The invention discloses a comprehensive regulation and control method of high-order local flatness defect of ultra-thin cold-rolled strip steel with a high width-to-thickness ratio. The comprehensive regulation and control method comprises the following steps of: establishing a flatness pattern recognition model based on super high-order Legendre orthogonal polynomials, to be specific, selecting appropriate Legendre polynomial degrees according to number of channels of a detecting roller and stated standard error requirements, which describes the measured high-order flatness state of the cold-rolled strip steel, avoids the error message of local high points or low points and reduces the calculated amount of an evaluation function; establishing an efficacy evaluation function grading regulation and control model based on high-order flatness pattern recognition: to be specific, adopting a first-grade regulation and control efficacy function based on Legendre polynomials according to typical regulation and control measures of a tilting roller, a bending roller and lateral movement; and establishing a second-grade regulation and control efficacy function based on local high-order flatness according to a segmented cooling regulation and control measure.

Description

technical field [0001] The invention relates to the field of automatic measurement of steel rolling machinery and equipment, in particular to a hierarchical control method based on high-order shape defects suitable for large-width-thick-ratio ultra-thin cold-rolled steel strips, aluminum strips, copper strips and other strip products. Background technique [0002] The shape index of cold-rolled strip has a great influence on the follow-up process and the quality of the final product. Therefore, in-depth research on the shape detection and its closed-loop control model makes full use of the shape control means to eliminate the online shape deviation during the rolling process to the greatest extent. It is the key technology to improve the shape quality of the rolled strip. The purpose of flatness closed-loop control is to take the flatness signal measured by the flatness meter as the feedback signal, calculate the deviation between the measured flatness and the target flatnes...

Claims

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Application Information

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IPC IPC(8): B21B37/28B21B37/42
CPCB21B37/28B21B37/42
Inventor 杨利坡宋蕾刘军于丙强王军生
Owner YANSHAN UNIV
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