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

Abstract

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.