一、前言 我国铁路货车球墨铸铁轴瓦采用前端镶装塑料瓦头的试验研究工作已进行多年,实践证明这是一种解决货车轴瓦端磨、减少燃轴事故的有效方法。几年来,对多种不同材质的塑料瓦共进行了大量装车及室内各项性能试验,结果表明,MC尼龙、聚甲醛及尼龙1010三种材质的塑料瓦头性能最好。过去在各项性能试验中,这三种材质大都同时进行过试验,并已提出报告。唯塑料瓦头材质与 I. INTRODUCTION The experimental research on front-end mounted plastic cast-iron head cast iron ductile iron bush in our country has been carried out for many years. Practice has proved that this is an effective way to solve the problem of end-of-mill bearing bush and reduce the combustion shaft accident. Over the past few years, a large amount of loading and indoor performance tests have been carried out on a variety of plastic tiles with different materials. The results show that the plastic tile with MC nylon, polyoxymethylene and nylon 1010 has the best performance. In the past in the performance tests, most of these three materials were tested at the same time and reports have been submitted. Only plastic tile material and