Modeling and Analysis of Full Ball Load Distribution of Ball Screw with the Combined Load

doi:10.3901/JME.2020.17.126

Abstract

Abstract: Ball screws are the driving component used to convert rotational motion to linear motion, which has an important influence on the transmission accuracy of machine tools. Under the action of load, it is often assumed that the contact load between balls and raceways is uniform and the difference of contact load for balls is ignored, which seriously affect the accuracy of position error compensation for ball screws. In order to improve the position accuracy, a full ball load distribution model is proposed, and the dynamic and static contact load distribution of balls under the axial and radial coupled load is analyzed. The consistency of the model is verified by comparing with the finite element analysis. On this basis, the influence of geometric error on the dynamic and static contact load distribution of balls is analyzed. Based on the full ball load distribution model and elastic deformation theory, the position deviation and position variation of ball screw under the coupled load is obtained by numerical simulation. The experimental results show that the proposed load distribution model, which take the geometric errors of balls into account, has a good reference significance for improving the position deviation prediction and position error compensation of ball screws.

Key words: ball screw, combined load, load distribution, contact deformation, position precision

CLC Number:

TG156

ZHAO Jiajia, LIN Mingxing, SONG Xianchun, LUO Weichao, SONG Liwei. Modeling and Analysis of Full Ball Load Distribution of Ball Screw with the Combined Load[J]. Journal of Mechanical Engineering, 2020, 56(17): 126-136.

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