Abstract The wear coefficient is an important parameter that directly determines the wear rate of ball–raceway contact in ball screws and thus affects the degradation of the accuracy of ball screws and computer numerical control machine tools. However, few studies have experimentally studied the wear coefficient of ball screws. The present paper proposes a model for calculating the wear coefficient by considering the wear mechanism at the ball–raceway contact in ball screws. More importantly, a novel test method is implemented to measure the wear coefficient of seven double-nut ball screws, with total running of 48 million revolutions. Experimental results show two obvious wear stages and give wear coefficients that are several orders of magnitude lower than the empirical wear coefficient for continuous sliding friction between steel and steel, mainly owing to the special motion and wear mechanism of ball screws. The findings are important to the study of the degradation of the performance of ball screws due to wear.

中文翻译：

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双螺母滚珠丝杠磨损系数的实验分析

摘要 磨损系数是直接决定滚珠丝杠滚珠-滚道接触磨损率的重要参数，进而影响滚珠丝杠和计算机数控机床精度的退化。然而，很少有研究对滚珠丝杠的磨损系数进行实验研究。本文提出了一种计算磨损系数的模型，该模型考虑了滚珠丝杠中滚珠-滚道接触处的磨损机制。更重要的是，采用了一种新颖的测试方法来测量七个双螺母滚珠丝杠的磨损系数，总运行次数为 4800 万转。实验结果显示了两个明显的磨损阶段，磨损系数比钢与钢之间连续滑动摩擦的经验磨损系数低几个数量级，主要是由于滚珠丝杠的特殊运动和磨损机制。这些发现对于研究由于磨损导致的滚珠丝杠性能下降具有重要意义。