Three-dimensional reconstruction of a shaft-type deep-small hole with variable aperture based on image processing for ultrasound detection

• Published in: Insight (Northampton) Vol. 63; no. 4; pp. 236 - 240
• Main Authors: Gangfeng, Zheng, Bolin, Wu, Ze, Li, Songfeng, Liu, Hao, Dong, Haotian, Zhang
• Format: Journal Article
• Language: English
• Published: The British Institute of Non-Destructive Testing 01.04.2021
• Subjects: Deep-Small Hole; Least-Squares Method; Three-Dimensional Reconstruction; Ultrasound Testing; Variable-Aperture Defect
• ISSN: 1354-2575
• DOI: 10.1784/insi.2021.63.4.236

A method based on image processing for ultrasound detection is proposed to solve the problems of variable aperture and deviation from the axis in deep-small hole machining of shaft components in the field of mechanical manufacturing. First, the deep-small hole echo signals collected in the experiment are converted into polar coordinates and the complete information of each section is extracted. Next, the section is fitted using the least-squares method. Then, the centre track and radius are interpolated. Lastly, three-dimensional data are visualised to realise the three-dimensional reconstruction of a deep-small hole with variable aperture that deviates from the axis. The findings demonstrate that, when machining a deep-small hole in fine-axis components, this method has a good effect on the reconstruction of a hole with variable aperture that deviates from the axis, which is in accordance with the actual situation.