Identification method of buckling of band steel

Abstract

The present invention discloses an identification method of buckling of a band steel. The method comprises the steps: 1) obtaining the original image of the band steel; 2) performing enhancement process of the original image through adoption of a contrast stretching method; 3) obtaining an edge image according to the image after enhancement process; 4) performing the Hough transformation of the edge image, and determining whether the image has the straight line or not according to the result of the Hough transformation, wherein the slope of the straight line is the approximately equal to the band steel edge straight line, and the straight line is aggregated in a narrow range; and 6) if the image has the straight line, determining the buckling of the band steel occurs, wherein the area where the straight line is aggregated is the position where the buckling occurs. The identification method of buckling of the band steel is able to rapidly and accurately perform on-line identification of the buckling defect of the band steel and perform positioning of the position where the buckling defect is located. Besides, the identification method of buckling of the band steel is high in efficiency, high in precision and good in reliability; and moreover, the identification method of buckling of the band steel is good in flexibility and is convenient for workers to operate.

Description

technical field [0001] The invention relates to an on-line identification method, in particular to a method for on-line identification of steel strip defects. Background technique [0002] During the production process of cold-rolled strip steel, the high-speed operation of the rollers in the annealing furnace may cause random buckling of the strip steel at high temperature. The scoop phenomenon is a scoop-shaped defect formed by the bending of the steel plate both horizontally and vertically. The curvature phenomenon and the wave phenomenon belong to the defects of the same nature, and they are collectively referred to as unevenness. Since the warping phenomenon of the steel plate occurs in a closed annealing furnace, and there are a large number of rollers in the annealing furnace, it is often not easy to find the position where the warping phenomenon occurs in the thin steel strip. Therefore, it is necessary to analyze the warping phenomenon The cause of the phenomenon ...

AI Technical Summary

Problems solved by technology

Since the bending phenomenon of the steel plate occurs in a closed annealing furnace, and there are a large number of rollers in the annealing furnace, it is often not easy to find the location where the bending phenomenon occurs in the thin steel strip. Therefore, it is necessary to analyze the bending phenomenon The cause of the phenomenon is also very difficult

The buckling phenomenon will not only reduce the yield of strip steel, damage the unit equipment of the production line, but also affect the stable operation of the production unit

[0003] At present, manual observation is usually used to monitor and find the online strip warpage phenomenon in the annealing furnace. However, the manual monitoring method is not only time-consuming and laborious, but also leads to missed and wrong detection of the warpage phenomenon due to the visual fatigue of the staff.

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