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A key paper of latest issue (Vol.19 No.4) of CHINA FOUNDRY
Time:2022-08-28   Hits:1374

Title: Sub-pixel high precision dimensional measurement method for aero-engine hollow turbine blade based on industrial computed tomography image

AuthorYa-nan Wang, *San-san Shuai, Xing-fu Ren, Tong-tong Hu, Jiang Wang, and Zhong-ming Ren

Corresponding author

*San-san Shuai: Born in 1988, Ph. D. His research interests mainly focus on metal solidification behavior under magnetic field and X-ray imaging during materials processing
as well as non-destructive test of materials. To date, he has published over 40 research papers in the aforementioned topics.
E-mail: shuaiss18@shu.edu.cn

Abstract: Aero-engine hollow turbine blades are work under prolonged high temperature, requiring high dimensional accuracy. Blade profile and wall thickness are important parameters to ensure the comprehensive performance of blades, which need to be measured accurately during manufacturing process. In this study, a high accuracy industrial computed tomography (ICT) measuring method was developed based on standard cylindrical pin and ring workpieces of different sizes. Combining ICT with cubic spline interpolation, a sub-pixel accuracy was achieved in measuring the dimension of component. Compared with the traditional and whole-pixel level image measurement method, the cubic spline interpolation algorithm has the advantages of high accuracy in image edge detection and thus high accuracy of dimensional measurement. Further, the technique was employed to measure the profile and wall thickness of a typical aerospace engine turbine blade, and an accuracy higher than 0.015 mm was obtained.
Keywords: dimensional accuracy; industrial computed tomography; cubic spline interpolation; sub-pixel accuracy


If you'd like to learn more, please get it free at the following website: https://www.springer.com/journal/41230 or http://www.foundryworld.com/en/indexzhong.php/zazhishe/chinaguokan/type/3


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