关键词: 航空发动机, 视觉测量, 气膜孔, 轴线矢量

Abstract: With regard to the measuring difficulty of the axis direction of those film cooling holes on the high-pressure turbine blades,a 5-axis vision coordinate measuring system was established to explore and study the inspecting method and equipment for film cooling holes,which combined non-contact vision measurement with traditional multi-axis coordinate measurement together.In order to derive the axis vector parameter of the measured hole,the measuring method to realize the 3D morphology reconstruction of film cooling hole by depth from focus technology and transform the image sequence captured by the industrial camera to the 3D physical data was proposed.And then,the axis vector of the target hole could be derived by spatial line fitting.Finally,to verify the effectiveness and feasibility of the vision measuring method proposed in the paper,a high-pressure turbine blade was selected and the axis vector of the target hole on its leading edge was inspected by the system ten times,in which the repeatability accuracy of the axis angles was smaller than 0.30°.Therefore,a measurement technology solution of the axis direction of film cooling holes was provided.

Key words: Aero engine, Vision measurement, Film cooling holes, Axis vector