高速电主轴角接触球轴承刚度及其对电主轴临界转速的影响分析

发布时间：2018-11-15 10:33

【摘要】：针对高速电主轴角接触球轴承高转速的特点,建立角接触球轴承的拟静力学模型,分析径向力与电主轴转速对轴承滚珠与轴承沟道的接触角、接触力的影响;根据轴承与滚珠的受力平衡条件,研究角接触球轴承刚度受电主轴转速与预紧力的影响;基于Timoshenko梁理论,建立轴承-主轴的有限元模型,分析不同预紧力下角接触球轴承对电主轴临界转速的影响。结果表明:径向力与电主轴转速将改变轴承滚珠与轴承沟道的接触角与接触力,减小预紧力与升高转速会导致轴承的刚度降低,进而降低电主轴的临界转速;需要综合考虑角接触球轴承离心力、内圈膨胀和预紧力等影响因素,才能有效保障电主轴的安全运行。
[Abstract]:According to the characteristics of high speed motorized spindle angular contact ball bearing, the quasi-static model of angular contact ball bearing is established, and the influence of radial force and motor spindle speed on contact angle and contact force between bearing ball and bearing channel is analyzed. According to the balance condition of bearing and ball bearing, the influence of motor spindle speed and preload on the stiffness of angular contact ball bearing is studied. Based on Timoshenko beam theory, the finite element model of bearing-spindle is established, and the influence of angular contact ball bearing on the critical speed of motorized spindle under different preloading forces is analyzed. The results show that the contact angle and contact force between bearing ball and bearing channel will be changed by radial force and motorized spindle speed, and the stiffness of bearing will be reduced and the critical speed of motorized spindle will be reduced by decreasing preload force and increasing speed. The influence factors such as centrifugal force, inner ring expansion and pretightening force of angular contact ball bearing should be taken into account in order to ensure the safe operation of the motorized spindle effectively.
【作者单位】：浙江大学机械工程学院;
【基金】：国家自然科学基金(11172260;11372270)
【分类号】：TG659

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