钢轨廓形打磨对京广线曲线磨耗速率及钢轨表面状态的影响

Influence of Rail Profile Grinding on Curve Wear Rate and Rail Surface State of Beijing—Guangzhou Railway

针对京广线曲线上股钢轨鱼鳞伤严重,下股光带不良,轨距角有明显斜裂纹等问题,分别采用传统打磨方式与廓形打磨方式消除。对打磨前后效果进行分析比对得出,采用廓形打磨后,曲线上股轨面状态较好,斜裂纹、剥离掉块等发展速率均得到控制,曲线下股光带分布合理;采用传统打磨方式,钢轨表面鱼鳞伤得到消除,但是由于轨距角处切削量太大,导致轨侧有高频次接触,不利于减缓钢轨磨耗。提出研发适用于我国线路的钢轨打磨列车,制定合理的钢轨打磨周期及打磨策略,优化钢轨廓形打磨委外服务模式和优化钢轨廓形的建议。

With a view to problems in the Beijing-Guangzhou Railway,such as serious fish-scale existing on curve upper rail,poor optical tape of lower rail and obvious oblique crack of track distance,etc.,conventional grinding and profile grinding are separately used to eliminate the problems.According to the effects compared before and after grinding,upon profile grinding,the rail surface state is better for curve upper rail,the development rate of oblique crack and peeling,etc.is controlled and the optical tape is distributed rationally on curve lower rail.Based on conventional grinding,fish-scale on rail surface is eliminated,however,due to the excessive cutting output of track distance,high-frequency contact occurs at the track side,which is not good for slowing down rail wear.The article proposes to develop rail grinding trains that are suitable for domestic routes,develop a rational rail grinding cycle and grinding strategy,optimize an outsourced rail profile grinding service mode and improve rail profiles.