关键词: 插铣, 半开式整体叶轮, 分层面, 轨迹规划

Abstract: To improve the roughing efficiency of semi-open integrally bladed impellers and promote the functional perfection of domestic commercial Computer-Aided Manufacturing (CAM) software, an investigation is conducted into the trajectory planning problem for multi-axis plunge milling Numerical Control (NC) machining of semi-open integrally bladed impeller passages.Initially,the passage layers are constructed by using the equal parameter line method. The machining area is then partitioned based on the passage width,and different diameter tools are selected to reduce the number of toolpaths. The passage boundaries are calculated by intersecting the layer surfaces with the left and right blades. The tool center points are sampled at equal arc lengths according to the step size. Subsequently,the normal direction of the layer surface serves as the initial tool axis,while the direction orthogonal to layer surface normal direction and the surface u direction is chosen as the search axis direction. The tool axis is rotated along the search axis to find the critical non-interfering tool axis,which is adopted as the final safe tool axis. The calculation of the tool axis follows a sequence from the boundary to the middle,and interpolation is performed on the intermediate tool axis to ensure smooth transitions. Finally,cutting simulation is conducted to validate the toolpaths,confirming their high roughing efficiency and excellent machining results.

Key words: plunge milling, semi-open integral impeller, channel layer, trajectory planning