基于ANSYS的模切机曲轴静力学与模态分析

ANSYS-Based Static and Modal Analysis of the Crankshaft of Die-Cutting Machine

模切机曲轴的性能影响模切的速度和精度。本文分析现有模切机曲轴特性,对曲轴进行有限元分析,运用Solidworks软件建立曲轴三维模型,导入ANSYS Workbench软件模拟分析曲轴在模切机工作时的静态力学特性以及曲轴的振动特性,得到了应力、应变云图和模态振型图。静力分析结果表明,最大应力为242.54MPa,小于轴的屈服极限强度,符合实际要求。模态分析结果表明,曲轴在低阶频率下以弯曲变形为主,最大振型位移出现在曲轴的两端;在高阶频率下以弯曲和扭转变形为主,主要发生在曲轴的两端连接肘杆的轴端。得到该曲轴的最小固有频率,为该曲轴的可靠性分析、疲劳强度校核提供计算依据。

The performance of the crankshaft affects the die cutting speed and accuracy.In order to analyze the characteristics of the crankshaft of the existing die-cutting machine,finite element analysis of the crankshaft is carried out,and a three-dimensional model of the crankshaft is established by using SolidWorks software,which is imported into ANSYS Workbench software to simulate and analyze the static mechanical characteristics of the crankshaft when it is working on the die-cutting machine as well as the vibration characteristics of the crankshaft,and stress and strain cloud diagrams and modal vibration pattern diagrams are obtained.The static analysis results show that the maximum stress is 242.54 MPa,which is less than the yield limit strength of the shaft and meets the practical requirements.The results of modal analysis show that the crankshaft is dominated by bending deformation at low-order frequency,and the maximum vibration displacement occurs at both ends of the crankshaft;bending and torsion deformation are dominated at higher-order frequency,which mainly occurs at both ends of the crankshaft connecting with the elbow rods at the shaft end.The minimum intrinsic frequency of the crankshaft is obtained to provide a calculation basis for the reliability analysis and fatigue strength checking of the crankshaft.