叶片曲面微结构加工刀位轨迹规划

Tool-path planning for machining of riblets on blade surfaces

针对基于单齿刀具的叶片曲面微结构加工效率不高的问题,以小叶轮为例对叶片曲面微结构加工进行了深入研究.先根据待加工叶片曲面的曲率信息,设计一种高效的微结构侧铣加工专用刀具——多齿鼓形刀;然后以叶轮叶片曲面五轴数控加工为背景,利用多齿鼓形刀对叶片曲面微结构的加工进行刀位轨迹规划,使加工出的微结构分布均匀;最后以计算实例验证提出方法的有效性,并计算其刀位轨迹长度和加工仿真的时间,与单齿刀具进行比较.结果证明:采用多齿鼓形刀所生成的刀位轨迹长度和加工仿真时间都约为单齿刀具的1/3,加工效率得到了明显的提高,约为单齿刀具的3倍.

Aiming at the problem that the machining of riblets on blades based on a single-tooth cutter is not efficient,taking a small impeller as the instance,a strategy for machining of riblets on blades is proposed.According to the curvature information of the blade surface for further processing,an efficient multi-tooth barrel cutter for flank milling riblets is presented.Then,based on a five-axis NC machining of impeller blade,the multi-tooth barrel cutter is used to plan tool path for machining the blade surface microstructure,so that the machined riblets are uniformly distributed.Finally,the effectiveness of the proposed method is verified by the instance,and the length of the tool-path and the machining simulation time are calculated,and compared with the single-tooth cutter.The results show that the total tool-path length generated by the newly introduced method and the machining simulation time are only about one third of that by the method using single-tooth cutter.Compared with the latter,the efficiency is significantly improved,about three times that of the single-tool cutter.