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基于NURBS的空間分度凸輪廓面重構與仿真
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國家自然科學基金資助項目（50875153）、“十一五”國家科技支撐計劃資助項目（2009BADA8B03）和山東省園藝機械與裝備重點實驗室資助項目


Profile Reconstruction of Spatial Indexing Cam and Simulation Based on NURBS
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    摘要:

    利用空間分度凸輪廓面方程獲取離散點云數(shù)據(jù)，采用非均勻有理B樣條(NURBS)重構凸輪廓面，構建空間凸輪參數(shù)化特征模型。基于該模型，進行凸輪分度機構的運動學仿真，生成加工制造模型，實現(xiàn)空間凸輪NURBS廓面的仿真加工和四軸銑削NURBS創(chuàng)成。仿真和創(chuàng)成誤差分析結果表明，從動件運動規(guī)律曲線更加光順，最大速度Vmax和最大加速度Amax等運動特性值均優(yōu)于修正正弦曲線，廓面創(chuàng)成誤差與加工路線的曲率有關，最大誤差出現(xiàn)在曲率絕對值最大處且不超過0.01 mm。因此，廓面NURBS重構技術，是一種有效的空間凸輪設計和創(chuàng)成方法。

    Abstract:

    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. 

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玄冠濤,邵園園,呂釗欽,馮顯英.基于NURBS的空間分度凸輪廓面重構與仿真[J].農(nóng)業(yè)機械學報,2012,43(6):226-229,234. Xuan Guantao,Shao Yuanyuan, Lü Zhaoqin, Feng Xianying. Profile Reconstruction of Spatial Indexing Cam and Simulation Based on NURBS[J]. Transactions of the Chinese Society for Agricultural Machinery,2012,43(6):226-229,234.

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  • 在線發(fā)布日期: 2012-06-19
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