预紧力对滚珠丝杠副精度影响的研究

为了更好的研究滚珠丝杠副的精度损失规律,提出了一种滚珠丝杠副精度损失的计算方法。该计算方法是在改进的运动学基础上结合滚珠与滚道间滑动特性与接触特性建立的。由于滚珠丝杠副的预紧力无法通过普通方法直接测量且运行过程中预紧力是不断变化的,计算过程中也考虑了预紧力的变化并使用摩擦力矩的测量值计算预紧力。此外,在专为滚珠丝杠副精度损失测量而设计的试验台上进行了滚珠丝杠副精度损失试验。将试验数据与计算数据进行对比与分析,结果表明该计算方法可以计算滚珠丝杠副的精度损失并预测其精度变化趋势。

Analysis of the Effect of Preload on Precision Loss of a Ball Screw

This study builds a theoretical model to quantify the precision loss of a double-nut preloaded ball screw to better understand the precision change of this type of ball screw. The model is based on the modified kinematic analysis combined with elastic deformation of slip motion between balls and raceways. Given that the preload force constantly changes during a continuously running process, the change of preload is considered in the precision loss calculation. The precision variation experiment was conducted on a test machine specifically designed for ball screw precision variation measurement. The experimental results of precision loss change versus time were obtained, and the estimated results were calculated. On the basis of the comparison of the two sets of results, the model can quantify the precision loss and predict the precision change of a ball screw.