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

作　　者：Ya-nan Wang San-san Shuai Xing-fu Ren Tong-tong Hu Jiang Wang Zhong-ming Ren 

机构地区：[1]State Key Laboratory of Advanced Special Steel,School of Materials Science and Engineering,Shanghai University,Shanghai 200444,China

出　　处：《China Foundry》2022年第4期307-320,共14页中国铸造（英文版）

基　　金：financially supported by the National Science and Technology Major Project "Aero Engine and Gas Turbine"(No.2017-Ⅶ-0008-0102);National Nature Science Foundation of China (No.51701112 and No.51690162);Shanghai Rising-Star Program (No.20QA1403800 and No.21QC1401500);Shanghai Science and Technology Committee (No.21511103600)

摘　　要：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.

关 键 词：dimensional accuracy industrial computed tomography cubic spline interpolation sub-pixel accuracy 

分 类 号：TG806[金属学及工艺—公差测量技术]