Integrated machining tool path planning using feature free spaces
Integrated machining tool path planning using feature free spaces
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DOI：
10.1080/0020754031000098920
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发表时间：
2003-01
影响因子：
9.2
通讯作者：
Y. Kim;E. Wang;Il-Kyu Hwang;H. Rho
中科院分区：
文献类型：
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作者：
Y. Kim;E. Wang;Il-Kyu Hwang;H. Rho
针对加工特征，提出了一种集成局部和全局刀具轨迹规划的自动加工刀具轨迹生成方法。从零件的实体模型和公差规格中自动识别加工特征，并获得这些特征之间基于几何的优先关系。一个单独的工艺规划模块使用这些信息来确定加工顺序、刀具选择和加工条件。从得到的加工计划中，我们为每一个装置生成加工刀具路径，结合局部和全局刀具路径。通过加工特征的虚拟面扩展加工特征，获得特征自由空间。这些包括自由空间分解的单元，这使得使用已建立的机器人运动规划技术成为可能。通过搜索特征自由空间的邻接图，增量生成特征之间的全局刀具路径，该邻接图表示零件在工艺方案每一步的自由空间。通过连续的偏移操作生成每个加工特征的局部刀具路径。使用启发式方法选择每个特征的局部刀具路径的开始和结束位置，以最小化全局刀具路径的每个部分的成本。该特征识别方法和刀具轨迹自动生成方法是综合加工工艺规划系统的两个模块。
We describe an automatic machining tool path generation method that integrates local and global tool path planning for machining features. From the solid model and the tolerance specifications of the part, we automatically recognize machining features, and obtain the geometry-based precedence relations between these features. A separate process planning module uses this information to determine the machining sequence, tool selections, and machining conditions. From the resulting process plan, we then generate machining tool paths for each set-up, combining local and global tool paths. Machining features are expanded through their fictitious faces to obtain feature free spaces. These comprise the cells of a free space decomposition, which enables the use of established robot motion planning techniques. Global tool paths between features are generated incrementally by searching the adjacency graph of feature free spaces, which represents the free space of the part at each step of the process plan. Local tool paths for each machining feature are generated by successive offsetting operations. The start and end positions for each feature's local tool paths are selected using a heuristic method to minimize the cost of each segment of the global tool path. This feature recognition method and the automatic tool path generation method are being developed as modules of a comprehensive machining process planning system.