基于NURBS的空间分度凸轮廓面重构与仿真  

Profile Reconstruction of Spatial Indexing Cam and Simulation Based on NURBS

作　　者：玄冠涛[1] 邵园园[1] 吕钊钦[1] 冯显英[2] 

机构地区：[1]山东农业大学机械与电子工程学院,泰安271018 [2]山东大学机械工程学院,济南250061

出　　处：《农业机械学报》2012年第6期226-229,234,共5页Transactions of the Chinese Society for Agricultural Machinery

基　　金：国家自然科学基金资助项目(50875153);"十一五"国家科技支撑计划资助项目(2009BADA8B03);山东省园艺机械与装备重点实验室资助项目

摘　　要：利用空间分度凸轮廓面方程获取离散点云数据,采用非均匀有理B样条(NURBS)重构凸轮廓面,构建空间凸轮参数化特征模型。基于该模型,进行凸轮分度机构的运动学仿真,生成加工制造模型,实现空间凸轮NURBS廓面的仿真加工和四轴铣削NURBS创成。仿真和创成误差分析结果表明,从动件运动规律曲线更加光顺,最大速度Vmax和最大加速度Amax等运动特性值均优于修正正弦曲线,廓面创成误差与加工路线的曲率有关,最大误差出现在曲率绝对值最大处且不超过0.01 mm。因此,廓面NURBS重构技术,是一种有效的空间凸轮设计和创成方法。To construct the spatial cam parametric feature model efficiently and accurately, discrete point cloud data were obtained by profile equation of spatial cam. Non-uniform rational B-splines （NURBS） was adopted to reconstruct the profile of spatial cam. Based on the parametric feature model, the spatial cam indexing mechanism was set up to perform kinematics simulation, and then the manufacturing model was generated to simulate the spatial cam NC machining. Finally, the spatial cam was machined on four-axis CNC machining center by NURBS interpolation method. The results showed the follower motion curves （the maximum velocity and acceleration ） were smoother than modified-sine curves. The profile machining error related to the processing route curvature, the maximum was not more than 0.01 mm and located in the maximum of the absolute curvature. Profile reconstruction based on NURBS was liable and effective for design and machining of spatial cam.

关 键 词：空间凸轮 NURBS 廓面重构 仿真 

分 类 号：TH112.2[机械工程—机械设计及理论]