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Generating 5-axis NC roughing paths directly from a tessellated representation

机译：直接从细分表示中生成5轴NC粗加工路径

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摘要

We describe a system that generates 5-axis roughing tool paths directly from a tessellated representation of a body. Instead of decomposing the shape into manufacturing primitives, we generate tool paths directly from the shape of the workpiece using measures of accessibility avoid collisions. There are three stages in our approach: visibility computation, posture definition and path interpolation. In the first stage, we use the concept of visibility to determine the directions from which a point in the delta-volume is likely to be accessible to an observer located outside the convex envelope of the object and describe a technique to compute this information rapidly using graphics hardware. However, visibility does not ensure accessibility because visibility cannot account for the diameter of the tool, the tool-holder or the spindle. In the posture definition stage, a local search is performed in the neighborhood of the visibility direction using rapid collision avoidance. The output of this step is a set of valid tool postures for every sample point in the delta-volume. Finally, all that remains to be done is to connect the valid postures into a valid continuous tool path. This is not a trivial task because the tool must not interfere with the part while interpolating between valid postures. In the third stage of our approach we interpolate collision free tool paths by performing NC simulation and path correction within the loop of path generation using rapid collision detection algorithms.
机译：我们描述了一种系统，该系统直接从物体的细分表示中生成5轴粗加工刀具路径。我们没有将形状分解成制造图元，而是使用可访问性度量直接从工件的形状生成了刀具路径，避免了碰撞。我们的方法分为三个阶段：可见性计算，姿势定义和路径插值。在第一阶段，我们使用可见性的概念来确定位于对象凸包络线外部的观察者可能从中访问增量量中的点的方向，并描述一种使用以下方法快速计算此信息的技术图形硬件。但是，可见性不能确保可访问性，因为可见性无法解决刀具，刀架或主轴的直径。在姿势定义阶段，使用快速避免碰撞在可见性方向附近执行局部搜索。此步骤的输出是增量体积中每个采样点的一组有效工具姿态。最后，剩下要做的就是将有效姿势连接到有效连续刀具路径中。这不是一件容易的事，因为在有效姿势之间进行插补时，工具不得与零件干涉。在我们方法的第三阶段，我们通过使用快速碰撞检测算法在路径生成循环内执行NC模拟和路径校正，来插补无碰撞工具路径。

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