基于锥束CT的飞秒激光加工气膜孔几何特征测量及表征  

Measurement and characterization of geometric features of femtosecond laser of film hole based on cone beam CT

作　　者：杨泽南 许骏杰 赵婉蓉 梁威 杨富强[2] 李志翔 黄魁东[2] YANG Zenan;XU Junjie;ZHAO Wanrong;LIANG Wei;YANG Fuqiang;LI Zhixiang;HUANG Kuidong(Science and Technology on Advanced High Temperature Structural Materials Laboratory,Beijing Institute of Aeronautical Materials,Aero Engine Corporation of China,Beijing 100095,China;Key Laboratory of High Performance Manufacturing for Aero Engine,Ministry of Industry and Information Technology,Northwestern Polytechnical University,Xi’an 710072,China)

机构地区：[1]中国航发北京航空材料研究院先进高温结构材料重点实验室,北京100095 [2]西北工业大学航空发动机高性能制造工信部重点实验室,西安710072

出　　处：《航空动力学报》2023年第5期1198-1209,共12页Journal of Aerospace Power

基　　金：青年托举人才工程项目(YESS20200408);财政部稳定支持项目(KZ90220107);国家科技重大专项项目(J2019-Ⅶ-0013-0153);国家自然科学基金青年基金(52005415);中国航空发动机集团产学研合作项目(HFZL2022CXY024)。

摘　　要：针对当前国内气膜孔加工存在的几何精度偏低、质量不稳定现状,通过计算机断层成像技术利用气膜孔切片图像,在特征分割、点云拟合基础上对不同工艺参数激光加工的气膜孔孔径及几何特征质量进行检测与评价。结果表明:超快激光工艺参数的圆形气膜孔通孔入口直径略大于出口,锥度在0.005°~0.020°之间,位置度误差最大为Ф0.072 mm,异型气膜孔入射角的范围在60°~70°之间。使用锥束CT(computed tomography)测量方法对气膜孔几何特征进行检测与评价是可靠的,具有重要工程应用价值。In view of the current situation of low geometric accuracy and unstable quality of film cooling holes at home,experiments with different process parameters of femtosecond laser were carried out.The film cooling holes were analyzed based on the feature segmenting and point cloud fitting from slice image through computed tomography technology.Diameter and geometric features were tested and evaluated.The results showed that the diameter of the inlet of the film holes was slightly larger than that of the outlet with the process parameters of ultrafast laser,where the taper was between 0.005°and 0.020°for the testing detected by cone beam CT(computed tomography).The maximum position error was 0.072 mm.The incident angle of the special-shaped hole was roughly between 60°and 70°.It is reliable to use cone beam CT measurement method to detect and evaluate the geometric features of film cooling holes.

关 键 词：气膜孔 单晶高温合金 飞秒激光加工 计算机层析成像技术 几何特征 

分 类 号：V263.1[航空宇航科学与技术—航空宇航制造工程] V448[理学—流体力学] O353.5[理学—力学]