Appearance quality detection method for punched nickel-plated steel belt

Abstract

The invention provides an appearance quality detection method for a punched nickel-plated steel belt. The method is divided into two stages, namely an offline stage and an online detection stage. At the offline stage, two standard images of the punched nickel-plated steel belt are acquired, and circle center coordinates of an initial punched hole in the upper left corner in each of the two standard images are extracted. At the online detection stage, first, the circle center coordinates and radius of an initial punched hole in a to-be-detected image of the punched nickel-plated steel belt arepositioned; second, a standard matching template is generated by use of the standard images obtained at the offline stage; third, the standard matching template and the to-be-detected image are subject to differential processing; and last, the quality of the punched nickel-plated steel belt is judged according to the differential processing result. The method has the advantages that parameter determination and appearance defect detection of the punched nickel-plated steel belt can be automatically completed, one-by-one calculation of parameters of each hole and the distance between the holes is avoided, detection speed is high, precision is high, and flexibility is high.

Description

technical field [0001] The invention relates to an automatic detection technology for the appearance quality of a multi-circular plate, in particular to a parameter detection method for a punched nickel-plated steel strip and a detection method for an appearance defect. Background technique [0002] The punched nickel-plated steel strip is a product obtained by punching holes on the surface of the cold-rolled white steel strip, and then performing electrochemical nickel plating. Because the punched nickel-plated steel strip has good electronic conductivity and corrosion resistance, it is cost-effective and suitable for large-scale continuous production. It is the most widely used current-collecting material in battery production. At present, it is mainly used in the fields of MH-Ni battery, nickel-cadmium battery for tools, sintered battery for military industry and battery plate manufacturing for rail transit. Compared with similar products manufactured by foreign develope...

AI Technical Summary

Problems solved by technology

However, this method has high labor intensity, low efficiency, strong subjectivity and high error detection rate.

Moreover, because steel coils are produced continuously, sampling cannot be carried out during the production process, so that even if production problems occur, problems cannot be found in time, and the parameters in the process cannot be measured

In recent years, with the rapid development of machine vision technology, some researchers have proposed a non-contact punching quality inspection method based on machine vision. In the acquired image, Hough transform or curve fitting is used to obtain each circle in the image ( That is, information such as the radius and center of the punching hole), on this basis, calculate the parameters such as the horizontal hole distance and the vertical hole distance between the punching holes one by one. Since there are many circles, it is necessary to analyze all the circles in the image, and the amount of calculation is very large. Time-consuming, it is difficult to meet the real-time detection requirements

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