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Efficiently constructing collision-free regions of tool orientations for holder in five-axis machining of blisk

Chinese Journal of Aeronautics 2020年第10期33卷 2743-2756页

作者： Zhiwei WANG Xiaojun LIN Yaoyao SHI School of Mechanical Engineering Northwestern Polytechnical UniversityXi’anShaanxi 710072China

Blisks with the integral structure are key parts used in new jet engines to promote the performance of aircrafts,which also increases the complexity of tool orientation planning in the five-axis *** is an essential task to find the collision-free tool orientation when the tool holder is pushed deep into the channel of blisk to increase rigidity and reduce *** the radius of the holder varies with the height,the line-visibility is no longer applicable when constructing collision-free regions of tool *** this paper,a method of constructing collisionfree regions without interference checking is *** work of finding collision-free regions resorts to solving the local contact curves on the checking surfaces of *** it further transforms into searching the locally tangent points(named critical points)between the holder and *** a tracking-based algorithm is proposed to search the sample critical points on these local contact *** the corresponding critical vectors are also calculated ***,the safety allowance,discrete precision and acceptable deviation are introduced in the algorithm to ensure accuracy by controlling the angle between two adjacent critical vectors *** that,the searched critical vectors are mapped orderly to two-dimensional space and the collisionfree regions are *** method is finally verified and compared with a referenced *** results show that the proposed method can efficiently construct collision-free regions for holder under the given accuracy.

关键词： Blisk collision-free region Five-axis Interference detection Machining Tool holder

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