Design and Establishment of the Machine VisionMeasuring System for Film Cooling Holes
BI Chao,HAO Xue,LIU Meng-chen,FANG Jian-guo
Aviation Key Laboratory of Science and Technology on Precision Manufacturing Technology,Beijing Precision Engineering Institute for Aircraft Industry, Beijing 100076, China
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.
毕超,郝雪,刘孟晨,房建国. 气膜孔视觉测量系统的设计与搭建[J]. 计量学报, 2020, 41(7): 775-780.
BI Chao,HAO Xue,LIU Meng-chen,FANG Jian-guo. Design and Establishment of the Machine VisionMeasuring System for Film Cooling Holes. Acta Metrologica Sinica, 2020, 41(7): 775-780.
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2020, Vol. 41 
