滚珠丝杠副使用寿命预测建模技术研究

Study on Life Prediction Modeling Technology of Ball Screw Pair

以数控机床进给轴的滚珠丝杠副为研究对象,结合滚珠丝杠疲劳损伤寿命的定义,分析了工艺参数对滚珠丝杠副寿命的影响,提出了一种滚珠丝杠副使用寿命预测建模方法。该方法通过对疲劳损伤寿命的进一步理论推导,使疲劳寿命公式更为详细且可以对不同切削路径和切削参数进行使用寿命的预测,得出丝杠上不同位置的使用寿命情况。在现有数控机床的基础上,选用三向测力仪器,采集卡等组成实验的切削力数据采集部分,运用VB开发的采集软件对数控机床OPC系统进行信息采集,建立不同工艺参数的切削实验,对特定零件进行加工,采集实际加工过程中的信息。运用MATLAB结合使用寿命预测模型对实验数据进行分析。实验结果表明,所建立的使用寿命预测模型能够反映各种工艺参数下的丝杠疲劳损伤寿命情况及变化规律。

Taking the ball screw pair of the feed shaft of CNC machine tool as the research object, and the influence of process parameters on the life of ball screw was analyzed based on the definition of fatigue damage life of ball screw. A method for predicting the life of ball screw pair was proposed. Through further theoretical deduction of fatigue damage life, the fatigue life formula can be more detailed and the service life of different cutting paths and cutting parameters can be predicted, and the service life of different positions on the lead screw can be obtained. On the basis of existing NC machine tools, three-way force measuring instrument and acquisition card are selected to compose the data acquisition part of experimental cutting force. The position information of OPC system of NC machine tools was acquired by VB development acquisition software, cutting experiments with different process parameters were established, specific parts were processed, and cutting in actual processing was collected. The force and position information was analyzed by using MATLAB combined with life prediction model. The experimental results show that the established life prediction model can reflect the fatigue damage life of the lead screw under various process parameters and the changing law.