轨道车辆轴端接地装置磨损性能试验研究

Experimental Study on Wear Performance of Axle End Grounding Device of Rail Vehicle

摘要: 本文以高速动车组轴端接地装置为研究对象，对碳刷在CuSn6和CuSn12两种型号摩擦盘下的磨损特性进行研究，在轨道车辆接地装置磨损试验机上进行了电流为0 A、250 A、470 A和700 A，模拟车速为160 km、250 km、300 km和350 km，接触压力为10 N、15 N、20 N、25 N和30 N的试验，研究电流、速度、压力等参数对碳刷和摩擦盘磨损性能的影响。研究表明，在无电流时，碳刷的磨损率随着接触压力的增加先增大后减少，合理的接触压力有利于降低碳刷的磨损率；碳刷和摩擦盘的磨损率与平衡温度温度均随着电流的增加而增大，随着电流的增加摩擦盘和碳刷之间的电蚀磨损逐渐增大；较大的硬度可以降低摩擦盘的磨损率。

Abstract: This paper takes the shaft end grounding device of high-speed EMU as the research object, the wear characteristics of carbon brushes under CuSn6 and CuSn12 friction discs were studied. The tests with current of 0 A, 250 A, 470 A and 700 A, simulated speed of 160 km, 250 km, 300 km and 350 km and contact pressure of 10 N, 15 N, 20 N, 25 N and 30 N were carried out on the rail vehicle grounding device wear tester to study the effects of current, speed and pressure on the wear performance of carbon brushes and friction discs. The research shows that when there is no current, the wear rate of carbon brush first increases and then decreases with the increase of contact pressure. A reasonable contact pressure is conducive to reduce the wear rate of carbon brush; the wear rate and equilibrium temperature of carbon brush and friction disk increase with the increase of current, and the electro erosion wear between friction disk and carbon brush increases gradually with the increase of current; larger hardness can reduce the wear rate of friction disc.