基于重构曲面的整体叶盘叶根过渡区域精确搭接加工轨迹生成方法

Precisely Overlapping Toolpath Generation Method for Machining Blade Root Transitional Surface of Blisk Based on Reconstructed Surface

提出一种基于曲面重构技术的叶根过渡区域加工轨迹的生成方法,生成的加工轨迹由已加工区域边界向叶根圆角边界渐变过渡,该加工轨迹与相邻区域的加工轨迹之间可实现精确搭接。该方法首先对已使用的加工轨迹进行分析,得到一组用于代表已加工区域的点集,并通过边界重构方法生成一条NURBS曲线作为该点集的边界。然后在已加工区域边界与叶根圆角边界之间插入多条过渡曲线,并重构叶根过渡区域,该区域即用于生成相应的加工轨迹。通过所提出的算法在某整体叶盘的叶根过渡区域实际加工中进行了应用,加工后的叶根区域与已加工区域之间可实现曲面的光滑搭接。

This paper presented a method to compute toolpaths for machining the transitional surface,which can gradually change from the boundary of the machined surface to the boundary of the fillet corner.The toolpaths generated by our method can precisely overlap the boundary of the region that has been machined.This method analyzed the toolpaths,which had been used,to find a group of points.These points were employed to represent the machined surface.Then a boundary extraction algorithm was employed to reconstruct a NURBS curve to represent the boundary of the point set.A group of curves were generated between the boundary of machined surface and the boundary of the fillet corner.Then those curves were applied to reconstruct the blade root transitional surface.And the surface was employed to generate relevant toolpaths.This method was applied to machining the blade root transitional surface of a blisk.The machining result indicated that the blade root transitional surface smoothly connected the upper region of the blade and the corresponding fillet corner after machining.