凸轮轮廓的CAD自动化建模及凸轮从动件机构的有限元疲劳分析

Krishnajith Theril, Shengyong Zhang
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引用次数: 1

摘要

本文阐述了在CATIA CAD软件包中实现简谐运动凸轮轮廓线三维设计过程自动化的方法。为了方便用户使用,开发了图形用户界面(GUI),用户可以在其中输入凸轮参数并直接获得三维CAD模型。实验结果表明,采用这种自动化设计方法可以减少90%的时间,同时也减少了出错的几率。由于高从动件负载对凸轮轮廓的影响,由于粗糙接触而在部件表面产生的高接触应力导致凸轮或滚子表面遭受接触疲劳失效的高风险。目前的工作重点是比较摆线凸轮和小摆线凸轮函数的疲劳寿命。利用ANSYS Workbench中的有限元分析(FEA)对其疲劳寿命进行了评估。在本研究中,我们将从动件视为凸轮与从动件之间的平面无摩擦接触。通过自动化方法建立了SHM和摆线凸轮轮廓线的三维模型,然后将这两个模型导入ANSYS中进行相同载荷条件下的疲劳分析。结果表明,摆线函数比SHM函数具有更高的疲劳寿命。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Automated CAD Modelling of Cam Profiles and FEA Fatigue Analysis of Cam-Follower Mechanisms
This paper illustrates a method to automate the 3D designing process of Simple harmonic motion (SHM) cam profile in CATIA CAD package. In a more user-friendly approach, a graphical user interface (GUI) is developed, where the users can enter the cam parameters and obtain 3D CAD model as direct result. It is observed that 90% time will be reduced by using this automated designing and also chance of errors also reduces. Due to the high follower load impacting on cam profile, high contact stresses induced on the component surfaces due to the asperity contacts cause the cam or roller surfaces to be subjected to high risk of contact fatigue failure. Present work focuses on comparing fatigue life of SHM and Cycloidal cam functions. The fatigue life is assessed using finite element analysis (FEA) in ANSYS Workbench. We have considered follower as flat-faced and frictionless contact between cam and follower in this study. After developing the 3D model of SHM and cycloidal cam profile through automated method, both the models were then imported to ANSYS for fatigue analysis under the same loading conditions. It has been found that cycloidal function has more fatigue life than SHM function.
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