Abstract: Cycloidal stripping milling technology has the advantages of high machining efficiency, small cutting force and high tool durability. However, due to the lack of path planning method of five-axis stripping milling, it is difficult to apply efficient stripping milling technology to integral impeller machining. To solve this problem, a path planning method for five-axis U-cycloidal stripping milling of integral impeller fillet-end milling cutter is proposed. The dimensionality reduction mapping relationship of impeller model was established, and the three-dimensional blade root curve was mapped to the two-dimensional plane as the boundary planning tool contact point for dimensionality reduction. The tool axis vector and tool position point were calculated based on the proportional relationship between the tool contact point and the blade on both sides of the flow channel, and the preliminary planning of the five-axis U-cycloidal stripping milling path of the fillet-end milling cutter was realized. The distance between the point on the blade root transition surface and the tool characteristic surface was calculated and the interference criterion model between the blade root transition surface and the fillet-end milling cutter was established. The tool's maximum axial interference was calculated by projection method, and the tool position point was optimized to eliminate the interference of the blade root transition surface. Finally, the impeller machining simulation is used to verify the effectiveness of the five-axis U-cycloidal path method. The results show that the five-axis U-cycloidal path can successfully realize the stripping-milling machining of the integral impeller with the fillet-end milling cutter, without over-cutting interference in the machining process, and the residual material is uniform, which can provide a good foundation for the subsequent machining of the impeller.

Key words: cycloidal machining, stripping milling, tool path, blade root interference