中国激光, 2010, 37 (S1): 358, 网络出版: 2010-10-29  

激光再制造中零件3D形貌重建的新型网格模型

A New Mesh Model for Reconstructing 3D Shape of Parts in Laser Remanufacturing
作者单位
天津工业大学激光工程中心, 天津 300160
摘要
逆向工程模型重建过程中在曲面和实体转换时常会出现曲面缝隙过大难以缝合成实体的情况, 而且不同的造型软件系统精度不同, 经常存在转换失败的现象, 因此, 在某些应用上用网格化模型代替实体模型能简化造型过程, 获得较高的效率。获取高质量的三角网格模型是逆向重建的关键。但是目前空间点云数据得到的网格化模型的形状无法控制,细节特征表现也不足,不能很好地指导机器人加工, 故在基于体算法的基础上提出了法矢量过滤法。实验证明,改进后的算法极大地提高了空间点云网格化的精度, 能保证最终生成的三角网格与原型的拓扑结构一致,并能很好地用于激光再制造中指导机器人的加工。
Abstract
Since the difference between accuracy of modeling software, the conversions from surface to solid often fail in model reconstruction. Therefore, the replacement of the solid modeling by grid model can simplify process of surface models and obtain high efficiency in some applications. So high-quality triangular grid model is crucial in the reconstruction. However, the shape of the current grid model of points is not well controlled and lacks detailed characterization. Therefore a normal vector filter criteria on the basis of body algorithm is present in this paper. The experiment proves that improved algorithm greatly enhances the precision of space point cloud mesh. That method guarantees that final triangular mesh has the same topology as the prototype, which can be well used for laser remanufacture to guide the robot processing.

刘美丽, 杨洗陈, 方艳. 激光再制造中零件3D形貌重建的新型网格模型[J]. 中国激光, 2010, 37(S1): 358. Liu Meili, Yang Xiche, nFang Yan. A New Mesh Model for Reconstructing 3D Shape of Parts in Laser Remanufacturing[J]. Chinese Journal of Lasers, 2010, 37(S1): 358.

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