Optimizing tool-path generation for three-axis machining of a sculptured impeller blade surface
Optimizing tool-path generation for three-axis machining of a sculptured impeller blade surface
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DOI：
10.1177/0954405411422327
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发表时间：
2012-01
期刊：
影响因子：
--
通讯作者：
H. Fan;G. Xi
中科院分区：
文献类型：
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作者：
H. Fan;G. Xi
提出了一种叶轮曲面三轴联动加工的刀具轨迹优化算法。针对压气机叶轮叶片型面的特殊性，将最陡升刀轨生成方法与叶片型面组成的流道中流体流动的特点相结合，得到了四个子型面。与整个造型叶片曲面相比，四个子曲面的曲率更小，计算效率更高。提出了一种优化算法来计算子曲面上的四条刀具子路径，并利用高效外圆角立铣刀实现了高效加工。通过连接子曲面上的刀具路径，提出了全局-局部加工策略，并针对上铣方法提出了不同的进给方向。所提出的三轴加工优化算法在效率和气动性能之间达到了完美的平衡，与传统的五轴加工相比，显著降低了加工时间和机床成本。文中还给出了一个试模实例及其实际加工。
This paper presents an algorithm to optimize the tool-path generation for three-axis machining of a sculptured impeller blade surface. Owing to the specific character of the sculptured compressor impeller blade surface, four sub-surfaces are obtained by combining the steepest-ascent tool-path generation method with the specialty of the fluid flow in the duct composed by the blade surfaces. Slighter curvature and more efficient calculations are achieved on the four sub-surfaces compared with that on the entire sculptured blade surface. An optimizing algorithm is proposed to calculate the four tool sub-paths on the sub-surfaces, and efficient machining is achieved by using the efficient bull-nose-end mill. The global–local machining strategy is advanced by connecting the tool paths on the sub-surfaces and the different feed direction is proposed due to the up-milling method. The proposed three-axis machining optimizing algorithm achieves consummate equilibrium between the efficiency and aerodynamics, and significantly reduces the machining time and the machine cost compared with conventional five-axis machining. An example test mould and its practical machining are also presented in the paper.