Abstract: Machining quality of clean-up regions has a strong influence on the performances of combinatorial-surface models. To improve the accuracy of tool centre path and the level of automatic processing, the adaptive adjustment of initial points and the optimization method of searching are put forward based on point-searching method. Taking the clean-up machining of the transition area between the aircraft engine blade platform and blade form as the research object, the point search method is studied in parameter field. According to the theory mentioned above, it adjusts the initial points automatically in directions of critical searching points，and optimizes the searching area. However, the distribution of searching points is irregular. To solve it, it proposes separating searching method with multiple searching points. Then, the control points, which generate the path of tool center, are controlled and homogeneous distributed. A spline is generated by fitting the control points. It takes the projection of the spline on the offset surface of blade platform as the path of tool center and analyzes its accuracy. To confirm the correctness and effectiveness of the proposed method, another example of computer implementation clean-up machining of the transition area between the blade form and damper platform is given.

Key words: clean-up;tool path;point-searching;pencil-cut