精密行星滚柱丝杠副行程误差影响因素试验研究

行程误差是评价行星滚柱丝杠副精度的重要参数,但关于行程误差影响因素及建模的研究较少。因此,首先对行星滚柱丝杠副行程误差影响因素进行分析,包括加工误差、安装误差及变形误差;然后,基于各项误差转换建立行程误差模型并对各项误差进行测量;最后,使用行程误差试验台测量了4根行星滚柱丝杠副的丝杠行程误差和6种不同负载工况下的丝杠副行程误差。试验结果表明,加工工艺水平和安装精度对行程误差指标的影响较大,丝杠副行程误差随负载的增加而增加,表明负载增加产生的变形误差对行程误差的影响较大,丝杠行程误差试验值与模型计算值的相对误差为1.62%～4.37%,丝杠副的相对误差为1.81%～6.53%,验证了模型的有效性,可为进给系统传动精度的分析提供参考。

Experiment research on influence factors of travel error of planetary roller screw pair

Travel error is an important parameter to evaluate the accuracy of planetary roller screw pair, but there are a few studies on the influencing factors and modeling of travel error. Therefore, firstly, the influencing factors of travel error of planetary roller screw pair are analyzed, including machining error, installation error and deformation error. Then, based on the error conversion, the travel error model is established and the errors are measured. Finally, the travel errors of four planetary roller screw pairs and the travel errors of planetary roller screw pairs under six different load conditions were measured with the travel error test bench. The test results show that the machining processing level and installation accuracy have a great influence on the travel error index, and the travel error of the screw pair increases with the increase of the load, which indicates that the deformation error caused by the increase of the load has a great influence on the travel error. The relative error between the test value of the screw travel error and the calculated value of the model is 1. 62% ~ 4. 37% , and the relative error of the screw pair is 1. 81% ~ 6. 53% . The effectiveness of the model is verified, the study can provide a reference for the transmission accuracy analysis of the feed system.