Precision loss of ball screw mechanism under sliding-rolling mixed motion behavior

滑-滚混合运动行为作用下的滚珠丝杠副精度损失

The sliding-rolling mixed motion behavior degrades the ball screw’s precision at different levels.Based on the sliding-rolling mixed motion between ball and screw/nut raceway,the ball screw’s precision loss considering different given axial loading and rotational speed working conditions was investigated.Since creep and lubrication relate to sliding and rolling motion wear,the creep and lubrication characteristics are analyzed under different working conditions.Besides,the precision loss was calculated considering the sole influence of sliding behavior between ball and screw and compared with the results from other current models.Finally,research on precision loss owing to the sliding-rolling mixed motion behavior was realized under given working conditions,and suitable wear tests were carried out.The analytical results of precision loss are in good agreement with the experimental test conclusions,which is conducive to better predicting the law of precision loss in stable wear period.

滑-滚混合运动行为在不同程度上会退化滚珠丝杠副的精度。基于滚珠与丝杠/螺母滚道之间的滑-滚混合运动分析,研究了滚珠丝杠副在不同轴向负载及旋转速度工况下的精度损失。由于滑动、滚动磨损与蠕滑、润滑紧密相关,研究了不同运行工况下蠕滑及润滑特性。此外,当探究滚珠与滚道之间的滑动运动行为对精度损失的影响时,计算了滚珠丝杠副的精度损失并对比了其他模型。最后,在给定运行工况下,研究了滑-滚混合运动下的精度损失,设计相关实验,对精度衰退模型进行验证。精度损失的分析结果与试验测试具有很好的吻合性,表明该模型能够很好地预测处于稳定磨损时期内的精度损失。