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

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振动与冲击 ›› 2017, Vol. 36 ›› Issue (10) : 19-25.

论文

黄伟迪，甘春标，杨世锡，徐立晖

作者信息 +

Analysis of stiffness of angular contact ball bearings and its effect on critical speed of a high speed motorized spindle

HUANG Weidi, GAN Chunbiao, YANG Shixi, Xu Lihui

Author information +

文章历史 +

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

A pseudo-static model of the angular contact ball bearings in a high speed motorized spindle is built based on their high speed rotation, from which the impacts of the bearing radial force and the speed of motorized spindle on the contact angle and the contact force between the ball and the bearing race are discussed. According to the force equilibrium condition of the bearing and the ball, the impact of the bearing preload on the bearing stiffness is studied. Then, the finite element models of the bearing and the spindle are set up based on the Timoshenko beam theory, from which the influence of the bearing on the critical speed of the motorized spindle with different preloads is studied. The results show that the radial force and the speed of the motorized spindle may change the contact angle and the force between the ball and the bearing race, the bearing stiffness degradation will arise as the rotate speed is high and the preload is decreased, and the critical speed of the motorized spindle can also decrease. Moreover, to guarantee the safety of the motorized spindle, the effects of the bearing centrifugal force, the inner expansion, and the preload should be taken into account.

导出引用

黄伟迪，甘春标，杨世锡，徐立晖. 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[J]. 振动与冲击, 2017, 36(10): 19-25

HUANG Weidi, GAN Chunbiao, YANG Shixi, Xu Lihui. Analysis of stiffness of angular contact ball bearings and its effect on critical speed of a high speed motorized spindle[J]. Journal of Vibration and Shock, 2017, 36(10): 19-25

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