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Iso-planar piecewise linear NC tool path generation from discrete measured data points

机译：从离散的测量数据点生成等平面分段线性NC刀具路径

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摘要

This article presents a method of generating iso-planar piecewise linear NC tool paths for three-axis surface machining using ball-end milling directly from discrete measured data points. Unlike the existing tool path generation methods for discrete points, both the machining error and the machined surface finish are explicitly considered and evaluated in the present work. The primary direction of the generated iso-planar tool paths is derived from the projected boundary of the discrete points. A projected cutter location net (CL-net) is then created, which groups the data points according to the intended machining error and surface finish requirements. The machining error of an individual data point is evaluated within its bounding CL-net cell from the adjacent tool swept surfaces of the ball-end mill. The positions of the CL-net nodes can thus be optimized and established sequentially by minimizing the machining error of each CL-net cell, Since the linear edges of adjacent CL-net cells are in general not perfectly aligned, weighted averages of the associated CL-net nodes are employed as the CL points for machining. As a final step, the redundant segments on the CL paths are trimmed to reduce machining time. The validity of the tool path generation method has been examined by using both simulated and experimentally measured data points.
机译：本文介绍了一种方法，该方法可直接从离散的测量数据点使用球头铣削生成用于三轴表面加工的等平面分段线性NC刀具路径。与现有的针对离散点的刀具路径生成方法不同，在当前工作中明确地考虑和评估了加工误差和加工表面光洁度。生成的等平面刀具路径的主方向是从离散点的投影边界得出的。然后创建一个投影刀具定位网（CL-net），该刀具网根据预期的加工误差和表面光洁度要求对数据点进行分组。单个数据点的加工误差是在球磨机的相邻扫掠表面的边界CL-net单元内评估的。通过最小化每个CL-net单元的加工误差，可以依次优化和建立CL-net节点的位置。由于相邻CL-net单元的线性边缘通常不完全对齐，因此关联CL的加权平均值-net节点用作加工的CL点。最后，修剪CL路径上的冗余段以减少加工时间。通过使用模拟和实验测量的数据点，已经检验了刀具路径生成方法的有效性。

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