Abstract:When milling difficulttomachine nickelbased superalloy，the tool edge has a significant effect on milling performance due to its direct contact with the workpiece.Through the establishment of precise 3D tool model and 3D milling simulation model，the milling processes with end mills of different edge radii are simulated，and the effect of edge radius on milling performance is analyzed.Finally，the milling experiment is carried out to verifiy the simulation.The results show that the edge radius has significant effects on the stress and temperature of concentration areas near the edge and the cutting forces in the feed and DOC directions，and the chip extrusion breakage increases with the increase of the edge radius，and the high stress and temperature the near the edge tend to decrease，and the simulation is in good agreement with the actual milling experiment.