磨合磨损分形预测研究

Fractal Prediction of Wear in Running-in Process

磨合是新机器投入正常运行前所必须经历的一个过程 .合理的磨合可防止机器在早期发生咬合 ,从而极大地延长其使用寿命 .基于磨损表面的分形表征、经典接触理论和磨损理论 ,建立了磨合磨损预测分形模型 .以铜合金销和45#钢盘试样组成摩擦副 ,在销 -盘摩擦磨损试验机上进行了磨合试验 .研究结果表明 ,基于所建立的模型的磨损率预测结果与试验结果基本吻合 .

Running in process is indispensable before starting the normal operation of new machines. A proper running in process can prevent damage to machine components caused by scuffing in the early stages and so can significantly increase their service life. Based on the fractal characterization of worn surfaces, classical contact mechanics, and wear theory, a fractal model for predicting wear during the running in process was developed. The wear depth rate of Cu Zn pin sliding against AISI 1045 steel disc in the running in stage was determined with a pin on disc friction and wear tester and compared with the calculated one based on the fractal model. It has been found that the two conform well to each other. Thus the suggested fractal model can be used to predict the wear behavior of materials in the running in stage.