Toolpath topology design based on vector field of tool feeding direction in sub-regional processing for complex curved surface
Toolpath topology design based on vector field of tool feeding direction in sub-regional processing for complex curved surface
复制标题
复杂曲面分区域加工中基于进刀方向矢量场的刀具路径拓扑设计
DOI：
10.1016/j.jmapro.2020.01.036
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发表时间：
2020-04
影响因子：
6.2
通讯作者：
Qin Feng-ze
中科院分区：
文献类型：
--
作者：
Ma Jian-wei;Lu Xiao;Li Guan-lin;Qu Zi-wen;Qin Feng-ze
针对复杂曲面零件采用统一加工参数的常规全局加工技术容易出现误差分布不均匀和局部超差的问题，提出了分区域加工方法。然而，现有的曲面分割标准仅基于曲面的几何特征，缺乏对加工过程中进给方向和进给运动稳定性的综合考虑，导致局部超公差和明显的切削振动。提出了一种基于刀具进给方向矢量场的分区加工刀具路径拓扑设计方法。通过双目标优化模型计算各切削点的最优进给方向，由最优进给方向建立空间矢量场。然后，根据投影矢量场的散度和旋转实现一次曲面分割，在用进给矢量对流线进行拟合后，通过判断机床轴线沿流线进给时运动学参数的突变来完成曲面细分。最后，根据子区域流线的形状特征，在子区域内设计了两种常用的刀具路径模式，并生成了子区域的刀具路径拓扑。对比实验表明，与传统的整体加工相比，加工区域的表面粗糙度和轮廓误差分别降低了22.52%和40.21%，有效地减少了加工误差，提高了加工质量。该研究对工程实践中复杂曲面零件的刀具轨迹生成具有重要的指导意义。
Conventional global processing technology with uniform processing parameters for complex curved surface parts easily tends to uneven error distribution and local out-of-tolerance, and the sub-regional processing method is proposed. However, existing criterions for surface segmentation are merely based on the geometric feature, lacking comprehensive consideration of feeding direction and feeding motion stability during processing, which induces local out-of-tolerance and obvious cutting vibration. A toolpath topology design method in sub-regional processing based on the vector field of tool feeding direction is proposed. By calculating optimal feeding direction at each cutting contact point through a bi-objective optimization model, the space vector field is built by the optimal feeding direction. Then, the primary surface segmentation is achieved based on the divergence and the rotation of the projected vector field, and after fitting of the streamline by feeding vectors, the surface subdivision is finished by judging the abrupt change of kinematics parameters when the axes of machine tool feed along streamlines. Finally, two frequently-used toolpath modes are designed in sub-regions based on the shape feature of sub-regional streamline and the sub-regional toolpath topology is generated. The comparison experiments show that surface roughness and profile error of the machining region decrease by 22.52 % and 40.21 % compared with conventional global processing, which proves that the proposed method can reduce machining error and improve processing quality effectively. The research provides important guidance for toolpath generation of the complex curved surface parts in engineering practice.
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