中文摘要：

为了解决复杂三角网格模型数控加工效率与精度之间的矛盾, 提出包括模型分割以及子区域轨迹规划的分治加工方法. 针对分治加工的需求, 提出一种基于加工区域特征表述的区域生长原则, 用于模型的区域生长分割;为避免在子区域中生成过多的短刀具轨迹, 对分割后的子区域进行区域优化合并与边界光顺处理, 子区域轨迹规划时对不同的特征子区域采用不同的刀具轨迹生成策略. 在等残留高度法刀具轨迹生成中, 提出初始轨迹生成方法,并改进扩展了刀具轨迹的投影偏置扩展过程, 以解决边界不规则子区域的刀具轨迹生成问题. 实例结果表明, 基于加工区域特征表述的区域生长原则能够有效地驱动加工模型的区域生长分割, 不同特征子区域以适当的刀具轨迹生成策略生成了有效的刀具轨迹.

英文摘要：

To solve the contradiction between machining efficiency and accuracy in NC machining of the complextriangular mesh model, a method of partition machining is presented, which is composed of the segmentationof mesh model and tool path generation of sub-regions. A growing principle based on machining feature formulationis proposed for the region growing segmentation. To avoid unnecessary short tool-path, sub-regions are optimized,and their boundaries are smoothed. While planning tool path, different strategies of tool path are adoptedfor different feature sub-regions. To generate constant scallop-height tool path from the sub-regions with irregularboundary, a method of original tool path generation is proposed, and the process of tool path projection and offsetis improved. An instance illustrates that the growing principle based on machining feature formulation can makeit efficient to segment the triangular mesh model, and the effective tool paths can be generated from different featuresub-regions with appropriate strategies.