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针对数控蜗杆砂轮磨齿机磨削过程中具有简谐振动的特点,建立其主轴系统的三维有限元模型。利用有限元分析软件ANSYS进行模态分析和谐响应分析。通过模态分析求解获得了主轴系统的固有频率和振型,并研究了角接触球轴承支承刚度对其固有频率的影响;通过谐响应分析获得了主轴系统的变形—频率响应曲线,最后通过计算临界转速来验证主轴系统是否发生共振。研究结果表明:增大角接触球轴承的支承刚度有利于提高主轴系统的固有频率。磨削激振力的频率在600Hz附近时,变形—频率响应曲线出现了最大的峰值响应为6.56μm。为了避免共振,主轴系统的工作转速应尽量避开一阶临界转速。
Aiming at the characteristics of simple harmonic vibration in grinding process of CNC worm wheel grinding machine, a three-dimensional finite element model of its spindle system is established. Using Finite Element Analysis Software ANSYS to Perform Harmonic Response Analysis of Modal Analysis. Through the modal analysis, the natural frequencies and modes of the spindle system were obtained. The influence of the bearing stiffness of the angular contact ball bearing on its natural frequency was studied. The deformation-frequency response curve of the spindle system was obtained through harmonic response analysis. Finally, Critical speed to verify spindle system resonance. The results show that increasing the bearing stiffness of the angular contact ball bearings is helpful to improve the natural frequency of the spindle system. When the frequency of grinding excitation force is around 600Hz, the maximum peak response of deformation-frequency response curve is 6.56μm. In order to avoid resonance, the working speed of the spindle system should be to avoid the first critical speed.