基于动态局部体素模型的四轴加工干涉研究
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摘要
针对模型求交方法导致的刀具干涉处理算法的效率瓶颈问题,对三角网格模型的特点、体素模型建立与优化、刀具干涉检测和处理等方面进行了研究分析。通过对截平面法和传统全局体素化算法的特点的归纳,建立了一种动态地按需建立局部体素模型,并且实现了模型相邻局部之间的数据复用;基于动态局部体素模型设计了三角网格模型四轴加工路径,提出了刀具干涉快速检查和处理算法,并利用光固化立体造型格式作为输入模型进行了测试实验。研究结果表明:动态局部体素化算法能够在相同内存容量下提高大尺寸三角网格模型体素化后的体素精度,基于动态局部体素化模型的干涉检测和处理算法具有较高的效率和准确性。
Aiming at the efficiency problem caused by the model intersection operation in tool interference processing algorithm,study on the feature of triangular grid model,building and advance of voxel model,the detection and processing of tool interference were carried out. A dynamically part-voxelization method was developed by generalizing the cutting-plane method and the traditional total-voxelization method.The data reuse between two adjacent part was achieved. A quick tool interference detection and processing algorithm for triangular grid model based on dynamically part-voxelization model was designed. Experiment was carried out with the stereo lithography( STL) format model was proposed. The research results indicate that the accuracy of huge triangular grid model's voxelization is improved through the dynamically part-voxelization method,and the tool interference is found quickly and modified correctly by the algorithm based on dynamically part-voxelization model with high efficiency.
Aiming at the efficiency problem caused by the model intersection operation in tool interference processing algorithm,study on the feature of triangular grid model,building and advance of voxel model,the detection and processing of tool interference were carried out. A dynamically part-voxelization method was developed by generalizing the cutting-plane method and the traditional total-voxelization method.The data reuse between two adjacent part was achieved. A quick tool interference detection and processing algorithm for triangular grid model based on dynamically part-voxelization model was designed. Experiment was carried out with the stereo lithography( STL) format model was proposed. The research results indicate that the accuracy of huge triangular grid model's voxelization is improved through the dynamically part-voxelization method,and the tool interference is found quickly and modified correctly by the algorithm based on dynamically part-voxelization model with high efficiency.
引文
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[2]孙殿柱,王超,刘华东,等.基于三角Bézier曲面平刀环切粗加工刀轨生成算法[J].计算机集成制造系统,2012,18(10):2191-2195.
[3]陈晓兵,廖文和,吴海兵,等.三角网格表面等残留高度刀轨生成算法[J].计算机辅助设计与图形学学报,2009,21(12):1800-1804.
[4]王鸿亮,郭锐锋,王品,等.基于双层次八叉树的STL模型体素化方法[J].计算机集成制造系统,2014,20(7):1553-1560.
[5] LORFNSEN W E,CLINE H E. Marching cubes:a high resolution 3D surface construction algorithm[J]. Computer graphics,1987,21(4):163-169.
[6]吴耕宇,潘懋,郭艳军.利用几何求交实现三角网格模型快速体素化[J].计算机辅助设计与图形学学报,2015,27(11):2133-2141.
[7]龚奇伟,张李超,莫健华. STL模型自动镂空的算法与应用[J].计算机辅助设计与图形学学报,2007,19(1):54-58.
[8] HUANG Jian,YAGEL R,FILIPPOV V,et al. An accurate method for voxelizing polygon meshes[C]. Proceedings of the 1998 IEEE Symposium on Volume Visualization,New York:IEEE,1998.
[9]李敏.金属板材渐进成形CAM技术研究[D].武汉:华中科技大学材料学院,2012.
[10] LIN A C,LIU H T. Automatic generation of NC cutter path from massive data points[J]. Computer-Aided Design,1998,30(1):77-90.
[11]陈阳,张立强,李东.连续小线段局部光顺插补算法[J].轻工机械,2017,35(3):71-75.
[12]李万军,赵东标,牛敏,等.五轴加工全局干涉检查及其避免[J].计算机集成制造系统,2011,17(5):1011-1016.
[13]段裕刚,刘志兵,王西彬,等.基于可视锥理论的五轴加工刀具碰撞检验方法[J].计算机集成制造系统,2014,20(11):2814-2819.