| 郭景浩， 张立强， 王勇.基于等距映射特征匹配的薄壁件镜像加工刀路补偿算法[J].轻工机械,2018,36(6):25-32 |
| 基于等距映射特征匹配的薄壁件镜像加工刀路补偿算法 |
| Tool Path Compensation Algorithm of Mirror Machining for Thin Walled Piece Based on Equidistant Mapping Feature Matching |
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| DOI：10.3969/j.issn.1005 2895.2018.06.006 |
| 中文关键词: 薄壁件 镜像铣 刀路补偿 等距映射 非线性最小二乘法 |
| 英文关键词:thin walled parts mirror milling tool path compensation isometric mapping nonlinear least squares method |
| 基金项目:国家自然科学基金项目(51775328) |
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| 摘要点击次数: 1921 |
| 全文下载次数: 1875 |
| 中文摘要: |
| 在大型薄壁件的镜像铣削加工时，装夹过程会造成工件的变形，如果使用初始的刀具路径会导致薄壁件厚度不均匀，过切或欠切。为了提高加工精度，在铣削加工之前添加激光扫描环节，并提出一种基于等距映射特征匹配的薄壁件镜像加工刀路补偿算法。应用运动学变换公式将激光扫描数据转换为点云，通过点云预处理简化过程，对理论曲面和实际曲面进行Delaunay三角网格曲面重构和计算定位点和匹配点任意两点间的测地线距离，再运用非线性最小二乘迭代计算完成基于等距映射理论的曲面特征匹配，最后基于面积坐标公式完成刀路的补偿。经过加工测量实验，该算法能减少67%加工误差，验证了该算法的有效性。 |
| 英文摘要: |
| In a mirror milling of large thin wall parts, the clamping process can cause deformation of the work piece. Using the initial tool path will lead to uneven thickness of the thin wall parts, cutting too much or not. In order to improve the machining accuracy, laser scanning was added before milling, and the tool path compensation algorithm of mirror milling machining of large thin walled piece based on laser scanning was proposed. In this algorithm, the laser scanning data was transformed into point cloud through kinematics transformation formula and the point cloud was simplified after the point cloud preprocessing. Then, the Delaunay triangular mesh surface was reconstructed from the theoretical surface and the actual surface and the geodesic distance was calculated between the anchor point and the match point.Then, the matching of surface feature is completed based on isometric mapping theory through iterative computation of nonlinear least squares. Finally, the compensation of the tool path was completed based on the area coordinate formula. The machining measurement experiment shows that the algorithm can reduce the machining error by 67%, and the validity of the algorithm is verified. |
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