基于点搜索的多曲面体清根轨迹生成方法

针对多曲面体清根加工轨迹的生成问题，建立了基于搜索初始点在参数域和物理域内搜索刀心点的点搜索算法。在搜索过程中，以多曲面体为研究对象，根据其结构特点确定搜索初始点和搜索中心，将参数域内搜索初始点与搜索中心的连线作为搜索方向在参数域内进行搜索。在物理域内生成参数域内对应搜索点的偏置点，判断偏置点到达多曲面体的距离是否满足距离条件，若满足距离条件则为刀心轨迹上的点。算例与实际加工结果表明，所提出的搜索算法搜索过程稳定，可以快速生成高质量的清根加工轨迹。

Clean-up Tool Path Generation by Searching-approach for Multi-patch Solid Model

Ministry of Education, China, Northwestern Polytechnical University, Xi’an, 710072
2.AVIC I Xi’an Aero-engine(Group) Ltd.,Xi’an,710021
Focusing on the clean-up tool path generation for multi-patch solid model, a new efficient and robust searching approach was presented. The multi-patch solid model was considered as a whole one, no single surface on the solid body was taken out for special consideration. Initial points were selected on the part surface in the physical domain and were converted into the parametric domain to determine the search center and search direction. Search operation was then carried out in the parametric domain, and the corresponding offset point for every point in the parametric domain was calculated in the physical domain. If the distance between the offset point and the solid model satisfied the distance qualification, it was the cutter-center point. Finally, a cutter-center curve was fitted with all the searched points. Examples of components that were machined using the proposed algorithms were also presented, Results show that the proposed method is clear to understand, robust, efficient, and the quality of the resulting path is high.