高速道岔钢轨打磨廓形及磨耗规律试验研究

Field Test on Grinding Profile and Laws of Rail Wear of High Speed Railway Turnout

针对多条线路上车站内18号高速道岔进行系统的现场试验,研究其目标打磨廓形的实际情况和道岔区钢轨磨耗演变规律。结果表明:目前全路道岔区基本上还是以60 kg/m钢轨轨头廓形作为目标打磨廓形。顺向过岔时直尖轨的垂向磨耗整体较曲尖轨更严重,曲尖轨的侧向磨耗明显大于直尖轨;逆向过岔时直尖轨、曲尖轨的垂向磨耗基本上和顺向过岔时规律相同,径向磨耗整体大于顺向过岔时的,应重点关注。顺向、逆向过岔时,长心轨的垂向磨耗不断增大,最终趋于稳定,叉跟尖轨的垂向磨耗和侧向磨耗均是在开始承载位置处磨耗量值最大。顺向过岔时长心轨径向磨耗在顶宽40 mm之后均处于相对较大值,叉跟尖轨径向磨耗峰值主要出现在顶宽20 mm处;逆向过岔时长心轨径向磨耗峰值主要出现在顶宽71 mm处,叉跟尖轨径向磨耗峰值出现位置和顺向过岔时相同。

A systematic field test study was conducted on the No.18 high speed turnout in multiple railway stations to explore the actual situation of the target polishing profile of the No.18 high speed turnout in China’s high speed railway and the development and evolution of rail wear in the turnout area.The research results indicate that currently,the overall turnout area is mainly focused on polishing the profile of the 60 kg/m steel rail head.When passing through a turnout in the forward direction,the vertical wear of the straight switch rail is generally more severe than that of the curved switch rail.The side wear of the curved switch rail is significantly greater than that of the straight switch rail.When passing through a turnout in the reverse direction,the vertical wear of the straight and curved switch rails is basically the same as when passing through a turnout in the forward direction,and the radial wear is overall greater than when passing through a turnout in the forward direction,special attention should be paid.When passing through a turnout in both forward and reverse directions,the vertical wear of the long point rail increases continuously and eventually stabilizes.The vertical wear and side wear of switch rails at the frog heel are the highest at the starting bearing position.When passing through a turnout in the forward direction,the radial wear of the long point rail is relatively high after the top width of 40 mm.The peak radial wear of switch rail at the frog heel mainly occurs at the top width of 20 mm.When passing through a turnout in the reverse direction,the peak radial wear of the long point rail mainly occurs at the top width of 71 mm.The peak radial wear of switch rail at the frog heel is the same as when passing through a turnout in the forward direction.