Effect of preload on the dynamic characteristics of ceramic bearings based on a dynamic thermal coupling model

Ke Zhang,Huaitao Shi,Qi Wang,Xiaotian Bai,Zinan Wang

doi:10.1177/1687814020903851

Ke Zhang, Huaitao Shi + Show 3 more

Open Access

https://doi.org/10.1177/1687814020903851

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Abstract

Ceramic bearings have a good dynamic output performance under an ultra-high, ultra-low temperature due to their small deformation property. Based on the Harris and Palmgren empirical equation, this article establishes the thermal transfer model of a ceramic motorized spindle. The thermal deformation of a ceramic angular contact ball bearing is calculated. A dynamic and thermal coupling model of the ceramic motorized spindle is built using the Hertz contact theory, which can determine the optimal preload force under different rotating speed conditions. The influence of different temperatures, preload, and rotation speeds on the bearing vibration characteristics was studied. The accuracy of the dynamic and thermal coupling model was verified by the motorized spindle experimental platform. The results show that the thermal deformation of the bearing is an important influencing factor for the output of the dynamic characteristics. Considering the thermal displacement of the bearing, the simulation accuracy of the ceramic motorized spindle-bearing system is in good agreement with the experimental results. By adjusting the bearing preload, the parameters of the rotating speed can effectively reduce the temperature rise and suppress the vibration. The spindle-bearing system model provides a theoretical basis for the dynamic development of a high-speed ceramic bearing.

Highlights

In the high-speed operation of motorized spindle, stator loss, rotor loss, and bearing friction generate a lot of heat
Thermal deformation has become an important factor that cannot be ignored in the dynamics of ceramic bearings.[3,4,5]
DX Zheng and WF Chen et al.[6] applied the comprehensive thermal grid model to calculate the thermal performance of high-speed angular contact ball bearings

Summary

Introduction

In the high-speed operation of motorized spindle, stator loss, rotor loss, and bearing friction generate a lot of heat. The influence of the inner and outer ring and of the ball of an angular contact ball bearing on the bearing dynamics, with changes in temperature, thermal deformation, rotation speed, and other factors, was studied.

Results

Conclusion