Toolpath generation for four-axis electrical discharge rough milling of blisk

Presented in this paper is a method to generate interference free toolpaths for four-axis electrical discharge rough milling of blisk. Initial toolpaths are generated for the blisk with initial tool orientation. Interference detection is then carried out between the electrode and workpiece, optimized tool orientation is selected for location where interference exists. As for locations where interference free tool orientation doesn´t exist due to narrow space of the blisk channel, effective toolpath correction method is carried out by adjusting the location of the electrode and regenerating the toolpath. Application result shows that the no interference will occur and the tool orientation deviation is small, thereby demonstrating the feasibility of the presented approach.