Abstract：Additive and subtractive hybrid manufacturing is one of the key technologies for aerospace manufacturing at present. Owing to the rotational degrees of freedom provided by five-axis machining center, the build direction can be continuously changed during additive manufacturing (AM) process, which can theoretically eradicate support structure. However, the introduction of multi-axis motion capacity increases the solution space, which poses great challenge for finding the solution of the process. In view of the above problem, a multi-axis AM process planning method based on centroid axis was proposed. On the basis of the definition of the centroid axis, the extraction method of centroid axis with “columnar” feature was studied, and sliced perpendicular to the centroid axis direction. Accordingly, the volume decomposition constraint was constructed. The slice position that dissatisfies the constraint was searched from the bottom to the top, where the part model was decomposed, and the direction of the centroid axis was used as the new build direction. The search was continued until the decomposition was completed. Finally, the part models are designed, and the feasibility of the method is verified through experiments, and support-free additive manufacturing of parts is realized.
2020, 
