Steel ball surface defect detecting method based on reorganization of steel ball surface reflection pattern integrity
A technology of surface reflection and defect detection, applied in optical testing of flaws/defects, measuring devices, material analysis by optical means, etc. The effect of workload
Inactive Publication Date: 2016-04-06
TIANJIN UNIV
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This method requires that there is a large difference in the optical properties between the defect part and the surface of the sphere, and it cannot effectively distinguish the part of the image where the difference in gray value is not obvious
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[0048] The embodiment of the present invention adopts such as figure 1 In the device shown, the light source cover is in the shape of a hemisphere, and the bottom surface of the light source cover is circular. The image sensor is two symmetrically placed CMOS image sensors, and two observation holes are symmetrically opened on the light source cover to collect the surface image of the steel ball. The light source is illuminated by a red LED light source. Considering that the bottom surface of the hemispherical light source cover is circular, the arrangement of the LED light source is designed to be a circular array evenly distributed along the edge of the bottom surface of the light source cover. In the embodiment, in order to ensure that the light source provides sufficient illumination intensity, a double-ring LED light source distribution is used. When detecting:
[0049] (1) Distribute the steel balls to be measured along a straight line in the vertical direction of the ...
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Abstract
A steel ball surface defect detecting method based on reorganization of steel ball surface reflection pattern integrity includes the steps of putting a to-be-detected steel ball in a diffuse reflection type light source cover, putting LED light sources arrayed in a certain pattern at the bottom of the inner side of the light source cover to serve as illumination light sources, arranging a light source baffle between the LED light sources and the to-be-detected steel ball, forming an observation hole in the light source cover, arranging an image sensor at the position, corresponding to the observation hole, outside the light source cover, evenly and fully coating the inner wall of the light source cover with a single-color material layer with the diffuse reflection characteristic, coating the single-color material layer with a regularly-arrayed pattern layer with the diffuse reflection characteristic, collecting a steel ball image with the surface reflecting the regular pattern on the inner wall of the light source cover through the image sensor, processing the image collected by the image sensor through the machine vision technology, extracting and recognizing the integrity of the image formed by the regular pattern on the surface of the steel ball, and detecting the defect of the surface of the steel ball. More types of surface defects can be effectively detected, and the difficulty and workloads of digital image processing are lowered.
Description
technical field [0001] The invention relates to a steel ball surface defect detection method. In particular, it relates to a steel ball surface defect detection method based on identifying the integrity of the reflection pattern on the steel ball surface. Background technique [0002] As the rolling element of bearings, steel balls are an important basic part with large production volume and wide application fields. Due to the constraints of the production process and equipment, the surface of the steel ball will inevitably have defects such as pits, rust, cracks, scratches, etc. These surface defects have an important impact on the accuracy, dynamic performance and service life of the bearing. . Therefore, the detection of steel ball surface defects is of great significance. [0003] At present, domestic steel ball manufacturers mainly adopt the method of manual visual inspection, that is, inspectors observe the surface of steel balls with the naked eye or a low-magnific...
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IPC IPC(8): G01N21/95
CPCG01N21/951
Inventor 付鲁华张恺王仲刘常杰姜美华宋宇航邢芊
Owner TIANJIN UNIV