Design and Establishment of the Machine VisionMeasuring System for Film Cooling Holes

BI Chao; HAO Xue; LIU Meng-chen; FANG Jian-guo

doi:10.3969/j.issn.1000-1158.2020.07.02

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Acta Metrologica Sinica ›› 2020, Vol. 41 ›› Issue (7) : 775-780. DOI: 10.3969/j.issn.1000-1158.2020.07.02

Design and Establishment of the Machine VisionMeasuring System for Film Cooling Holes

BI Chao,HAO Xue,LIU Meng-chen,FANG Jian-guo

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Abstract

In order to reconstruct the 3D shape characters of the film cooling holes of the high-pressure turbine blade, a non-contact machine vision measuring system with four motion axes is designed and then established. Composed of the frame of a coordinate measuring machine (CMM), a high precision turntable, special fixture of blades and image acquisition device etc, the system could combine the advanced vision detection and traditional coordinate measurement together to cope with the inspecting difficulties of the film cooling holes. To derive the 3D shape data of the film cooling holes, the method of depth from focus (DFF) is applied to realize the 3D reconstruction of the shape of the hole wall, which is verified by the follow-up experiment. In the experimental procedure, a film cooling hole of a high-pressure turbine blade is selected and inspected by the machine vision measuring system. With the focus image stack derived within the depth of the film cooling hole, the 3D shape characteristics of the hole is reconstructed by the method of DFF and then converted to the depth information, which could be employed to display the morphology of the hole wall and converted to the 3D data cloud. Therefore, the experimental results show the effectiveness of the vision measuring system for film cooling holes established.

Key words

metrology / film cooling hole / 3D shape / vision measurement / aero engine / non-contact

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BI Chao,HAO Xue,LIU Meng-chen,FANG Jian-guo. Design and Establishment of the Machine VisionMeasuring System for Film Cooling Holes[J]. Acta Metrologica Sinica. 2020, 41(7): 775-780 https://doi.org/10.3969/j.issn.1000-1158.2020.07.02

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