Loop细分曲面精加工刀具轨迹生成

细分曲面既能表示连续的几何设计模型也能表示离散的加工模型,避免了模型转换的复杂中间过程.细分曲面除了对于构造具有任意拓扑结构的复杂零件具有巨大的优势外,对于数字化制造也极具发展潜力.因此,对基于Loop细分曲面的精加工刀具轨迹生成算法进行了研究.首先利用基于弦长误差的自适应插值Loop细分得到精加工模型;然后利用等斜率跟踪法将精加工模型分割为平坦区域和非平坦区域.对各个区域依次进行处理,不同区域实施不同的刀具轨迹规划.据此,既避免了因细分过程数据量过大而导致的曲面精度不足或表面质量降低的问题,又可顺利计算整张曲面相对均匀残留高度的刀具轨迹.最后,为验证该算法的可行性进行铣削加工实验.

Tool path generation for Loop subdivision surface based finish machining

Both smooth design model and discrete machining model can be represented by the subdivision surface, which avoids the complex progress of model transformation. Subdivision surface can be used to generate a smooth limit surface on an arbitrary topology mesh, and thus has great advantage in modeling complex parts. In addition, it has great potential for applications in NC machining. The algorithm for tool path generation of finish machining based on Loop subdivision surface was investigated. The method of adaptive interpolation Loop subdivision surfaces was proposed to control the chord error between limit mesh and limit surface. The finish machining model was then decomposed into different regions by iso-slope curve tracing method, and different tool path patterns were calculated to obtain an even cusp height. Therefore, it is simple to generate the even cusp height tool path of the entire finish machining model, and the conflict between large-scale subdivision data and required high surface quality and precision is also solved. Milling test is implemented to verify the algorithm proposed.