New composite grinding wheel for rail grinding and experiments
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摘要: 利用钎焊技术和传统热压技术研发出一款钢轨打磨用新型复合砂轮,复合砂轮除含传统树脂砂轮的成分外还含金属结合剂金刚石插片,用其在钢轨打磨试验机上与传统树脂砂轮进行工件打磨对比试验,分析工件打磨后的打磨温度和表面粗糙度变化,并对钢轨打磨后的磨屑进行电镜、能谱分析。试验结果表明:与纯树脂砂轮相比,采用新型复合砂轮打磨工件,其打磨温度峰值下降10%左右,砂轮中插片数越多下降比例越大;工件表面粗糙度下降比例在9%以上,且随着砂轮中插片数量的增加而增大;同时,磨屑中球状磨屑比例更低,球状磨屑中O元素质量分数更小。Abstract: A new composite grinding wheel for rail grinding was developed by brazing technology and traditional hot pressing technology. The composite grinding wheel contained not only the components of traditional resin grinding wheel but also metal bonded diamond inserts.The new type of grinding wheel was used in the rail grinding test machine to compare with the traditional resin grinding wheel for workpiece grinding.The changes of grinding temperature and surface roughness after workpiece grinding were analyzed, and the grinding debris after rail grinding was analyzed by SEM and EDS.The results show that compared with the pure resin grinding wheel, the peak grinding temperature of the workpiece ground with the new composite grinding wheel decreases by about 10%, and the more inserts in the grinding wheel, the larger the proportion of the decrease.The surface roughness of the workpiece decreases by more than 9% and increases with the increase of inserts in the grinding wheel. At the same time, the proportion of spherical debris is lower, and the atomic mass fraction of O element in the spherical debris is smaller.
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Key words:
- diamond insert /
- grinding temperature /
- roughness /
- debris
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