Abstract
As an important precision transmission functional component in industrial fields such as large mechanical equipment, high-speed CNC machining center, and aerospace, the service life of the ball screw are directly related to the life of high-end equipment. Fatigue failure is the main failure mode of the ball screw in the transmission application where the transmission accuracy is not high. Therefore, the fatigue life of the ball screw is studied from the perspective of fatigue. The load distribution form of the double-nut ball screw under axial load is analyzed. Based on the ball load distribution, a mixed lubrication model of the ball screw considering non-Newtonian effect of lubricant is established, and a fatigue life prediction method of the ball screw based on maximum secondary surface stress is proposed. The lubrication performance of the ball screw under maximum contact load is compared with that under equal load distribution, and the effects of ball load distribution, curvature ratio, and temperature rise on fatigue life are analyzed. Two kinds of ball screw including BT GD8020 and NSK DFD8020 are used for running test of fatigue life, and the fatigue life calculation method based on the maximum secondary surface stress is verified. The hardness distribution of the transition zone between ball and raceway is analyzed, and the fatigue failure modes of two ball screws are explored.
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Funding
This work was supported by the National Natural Science Foundation of China (Grant No. 51105232) and the Natural Science Foundation of Shandong Province (Grant No. ZR2020ME166).
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Jiajia Zhao and Hongkui Jiang are responsible for providing overall research ideas. Xiangrong Xu, Yanfeng Li, Baobao Qi and Jianmin Wang are responsible for the measurement of friction torque for ball screw. Jiajia Zhao and Xiangrong Xu are responsible for experimental data analysis.
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Zhao, J., Jiang, H., Xu, X. et al. Fatigue life prediction of the preload double-nut ball screw under mixed lubrication. Int J Adv Manuf Technol 124, 4385–4401 (2023). https://doi.org/10.1007/s00170-022-09904-8
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DOI: https://doi.org/10.1007/s00170-022-09904-8