Image-based automobile hub steel bushing detection method

Abstract

The invention discloses an image-based automobile hub steel bushing detection method. According to the method, the hub images acquired on the production line are detected firstly and the area of the hub is located; a rectangular area is selected through combination of the actual position of the steel bushing on the hub, and if the rectangular area includes the steel bushing, the steel bushing is in the rectangular area with the center of the hub acting as the exact center; gray stretching is performed on the rectangular area and then circle detection is performed on the obtained grayscale map;N steel bushing candidate areas are found out of the detected circle through the clustering and N angular point search method; and the candidate areas are binarized, the number of the pixel points ofwhich the grayscale value is greater than the preset value in the candidate areas is counted and whether the areas include the steel bushing is judged. The method is applied to the field of automobile manufacturing, steel bushing detection is performed on the hub before leaving the factory and the hub having shortage of or no steel bushing can be found.

Description

technical field [0001] The invention belongs to the field of automobile manufacturing, in particular to an image-based detection method for automobile hub steel sleeves. Background technique [0002] A car hub is a barrel-shaped metal part that is centered on the shaft to support the tire. To be precise, it is installed at the central axle of the wheel and is an important part that connects the brake drum, the wheel disc and the half shaft. . At the center of the hub is the center hole of the hub, and beside the center hole are generally four to six threaded holes for fixing the hub on the axle. There are also different standards for the distance between threaded holes, and there are certain differences in the distance between different hub types. The steel sleeve is installed at the threaded hole position of the automobile wheel hub, and is used for installing bolts. In wheel hub manufacturing enterprises, the steel sleeve pressing machine is generally manually operated ...

AI Technical Summary

Problems solved by technology

In the wheel hub manufacturing enterprises, the steel sleeve is generally pressed into the threaded hole by manually operating the steel sleeve pressing machine, but there may be human factors causing pressure leakage, so the steel sleeve inspection is required before the hub leaves the factory.

Traditionally, human eyes are used to classify whether the car hub contains steel sleeves, but the accuracy of the judgment is not high, and long-term observation is easy to cause fatigue and low efficiency, which cannot meet the production needs of the factory

At present, there is no automatic method for judging whether the steel sleeve is pressed into the automobile wheel. Therefore, using computer vision detection technology, an accurate method for judging whether the automobile wheel contains a steel sleeve is very important for improving the production efficiency of the automobile wheel industry.

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