服役破损叶片的曲面重构及刀路生成方法

Surface Reconstruction and Tool Path Generation Method for Remanufacturing of Damaged Blades

针对常见的边缘破损叶片和顶端破损叶片,研究了其修复加工过程中的破损区域几何重构与刀路生成的方法。利用测量数据点排序、调整,构造叶片截面曲线,采用能量最小化原理对截面曲线进行光顺处理,并提出一种依据曲率将截面曲线对齐的方法。提出了一种基于放样建模的叶片模型几何重构方法,并针对边缘破损叶片与顶端破损叶片,提取破损区域并分别给出zigzag形加工刀路与螺旋形加工刀路的生成方法。不同方法重建叶片曲面质量的对比表明,所提方法能保证曲面的高斯曲率且更贴近其真实变形,验证了所提刀路生成方法的可行性。

A model reconstruction and CNC tool path generation of broken blades was proposed for the conditions that damage regions locatesd on the leading/trailing edges and on the tips.Measured data points were sorted,adjusted,and then utilized to construct sectional spline curves.The section curve was smoothed based on the theory of minimized energy,a method of aligning the sectional curves according to the curvatures was proposed.A model reconstruction method based on the lofting strategy was presented for the edge broken blades and the tip broken blades.The damaged regions were extracted,based on which the algorithm for generating zigzag tool path and the spiral tool path was given for CNC machining.Preliminary simulation results reveal that the proposed method guarantees the smoothness of the reconstructed surfaces and the approximation to the blade’s real size.The feasibility of the proposed tool path generation method was testifiecl.