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

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Journal of Vibration and Shock ›› 2017, Vol. 36 ›› Issue (10) : 19-25.

HUANG Weidi, GAN Chunbiao, YANG Shixi, Xu Lihui

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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.

Key words

Angular contact ball bearing / bearing stiffness / motorized spindle / critical speed / preload

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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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