Engine Camshaft Parameter Modeling and Grinding Dynamics Analysis
-
摘要: 针对发动机凸轮轴在数控磨削时产生弹性变形与振动的问题,提出了凸轮轮廓曲线相邻三点逐次样条拟合方法。并利用该方法在ANSYS有限元软件中对某凸轮轴进行了APDL参数化建模,对凸轮轴磨削时不同位置和不同转角下凸轮轴的弹性变形量进行了计算公式推导和有限元分析,对凸轮轴的固有频率和磨削约束条件下的振型、谐响应进行了分析。应用三点拟合方法可以快速、准确地建立凸轮轴的有限元模型,而适当选取磨削参数可以减小凸轮轴的弹性变形与振动,从而提高凸轮轴的轮廓精度和升程精度。Abstract: To reduce the elastic deformation and vibration of a camshaft while grinding, the adjacent 3-dot gradualfitting method for its contour curve is put forward; the camshaft's 3 D model is established by using the ANSYS parametric design language (APDL). The deformation at different positions and different angles is deduced and analyzed with the finite element method. The natural frequency, the vibration mode and the harmonic response of thecamshaft while grinding is analyzed. The grinding parameter selection principle, through which the deformation ofthe camshaft may be reduced, is proposed. The camshaft's 3 D model can be established quickly and accuratelywith the 3-dot gradual fitting method; the elastic deformation and vibration can be reduced when the grinding parameters are selected appropriately; the precision and lift precision of the camshaft contour can be enhanced.
-
Key words:
- camshaft /
- grinding /
- model /
- finite element method
-
[1] 龚时华. 凸轮轴高速磨削加工控制系统关键技术[D]. 湖北:华中科技大学, 2008 [2] 刘让贤, 刘佳, 黄宏亮. 凸轮轴干切削加工变形仿真研究[J].机械设计与制造, 2007，(1): 100～101 [3] 周志雄, 罗红平, 许第洪等. 切点跟踪磨削法中共建的刚度误差分析及其补偿[J]. 机械工程学报, 2003, 39(6): 98～102 [4] Walsh A P, Baliga B, Hodgson P A. Study of the crankshaft pingrinding forces[J]. Key Engineering Materials, 2004, 257: 75～78 [5] 郭三学, 任卫国, 李德新. 基于时序分析的凸轮廓型曲线拟合研究[J]. 机械科学与技术, 2002, 21 (5): 761～763 [6] 任敬心, 华定安. 磨削原理[M]. 北京: 电子工业出版社, 2010 [7] 李伯民, 赵波. 现代磨削技术[M]. 机械工业出版社, 2003 [8] 郭应征. 材料力学[M]. 北京: 中国电力出版社, 2010 [9] 张发贵. 凸轮轴的 CBN 高效磨削[J]. 现代零部件, 2009，(7):38～40 -
点击查看大图
计量
- 文章访问数: 222
- HTML全文浏览量: 25
- PDF下载量: 5
- 被引次数: 0
下载:
