Hundreds of mirror segments are needed to realize the laser fusion system and the next generation ground based extra-large telescopes. In order to manufacture the mirror segments, the ultra-precise optics grinding machine is essential equipment. As the most widely used motion transfer device in these machines, the ball screw mechanism need predetermine its positional accuracy. And the positional accuracy is based on load distribution of ball screw. This will be discussed in the article. Based on existing analytical models, an improved model is developed to accurately predict load distribution of ball screw. In this model, variation of contact angle is considered. And a simple approach considering of the influence of the geometry errors on the load distribution is developed. The results of this model demonstrate the load distribution of ball screw is not average and load of every ball falls from the position near the load to further. Downward trend is more marked when introducing the variation of contact angle into the model. Besides, the effect of geometry errors on the load distribution is not as remarkable as existing models. Based on the model, the larger ratio of helical pitch to screw diameter is, the worse the nonuniformity of load distribution is. This will impair the stiffness of ball screw and its positional accuracy. The calculated results are significant to ball screw design.
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ASME 2014 International Mechanical Engineering Congress and Exposition
November 14–20, 2014
Montreal, Quebec, Canada
Conference Sponsors:
- ASME
ISBN:
978-0-7918-4644-5
PROCEEDINGS PAPER
Load Distribution of Ball Screw With Consideration of Contact Angle Variation and Geometry Errors
Sheng Xu,
Sheng Xu
Shanghai Jiao Tong University, Shanghai, China
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Zhenqiang Yao,
Zhenqiang Yao
Shanghai Jiao Tong University, Shanghai, China
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Yaofei Sun,
Yaofei Sun
Shanghai Jiao Tong University, Shanghai, China
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Hong Shen
Hong Shen
Shanghai Jiao Tong University, Shanghai, China
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Sheng Xu
Shanghai Jiao Tong University, Shanghai, China
Zhenqiang Yao
Shanghai Jiao Tong University, Shanghai, China
Yaofei Sun
Shanghai Jiao Tong University, Shanghai, China
Hong Shen
Shanghai Jiao Tong University, Shanghai, China
Paper No:
IMECE2014-37380, V02BT02A024; 7 pages
Published Online:
March 13, 2015
Citation
Xu, S, Yao, Z, Sun, Y, & Shen, H. "Load Distribution of Ball Screw With Consideration of Contact Angle Variation and Geometry Errors." Proceedings of the ASME 2014 International Mechanical Engineering Congress and Exposition. Volume 2B: Advanced Manufacturing. Montreal, Quebec, Canada. November 14–20, 2014. V02BT02A024. ASME. https://doi.org/10.1115/IMECE2014-37380
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