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| Quality Inspection of Overall Bolt Dimension with Actual Edge Profile |
| KONG Ming1, XU Zhi-ling1, XU Yong2, WANG Kun3, LIU Zi-hao4 |
1. China Jiliang University, Hangzhou, Zhejiang 310018, China
2. Taizhou Fangyuan Quality Inspection Corporation,Taizhou, Zhejiang 318000, China
3. Aozhan Industrial Corporation, Hangzhou, Zhejiang 311221, China
4. Jiaxing University, Jiaxing, Zhejiang 314033, China |
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Abstract In order to detect the dimensional quality of bolts, a comprehensive quality inspection algorithm with the actual edge profile was proposed. The algorithm starts with designing tolerance zone diagrams for bolt dimension as template diagrams according to the tolerance requirements on bolt drawing. Then performing preprocessing to bolt images, including three-piecewise linear grayscale enhancement, median filtering, and maximum inter-class variance, etc. Further rotating the bolt images to a horizontal position and performing canny edge detection, cropping the bolt images and the template images to obtain a binary image with the same position, size and white edge contour. Finally, carrying out image addition operation to the processed bolt images and template images. Whether the overall size of the bolt is qualified can be determined by comparing the number of white pixels of the template images and the images after image operation. Furthermore, a discrete sequence diagram detection method was proposed to realize the comprehensive dimensional quality detection of bolts all around.
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Received: 06 July 2020
Published: 23 June 2021
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2021, Vol. 42 
