地铁大修钢轨廓形及其对等效锥度影响分析

Analysis of Rail Profile in Metro Overhaul and its Influence on Equivalent Conicity

地铁钢轨达到大修周期需进行更换,为探究大修期废旧钢轨的磨耗水平与轮轨匹配关系,实测了大修期钢轨的廓形,并仿真计算轮轨匹配等效锥度,并进一步分析大修钢轨廓形对等效锥度的影响。研究结果表明:(1)选用UIC519积分法,利用多体动力学软件UM计算轮轨匹配等效锥度合理可行,计算结果可靠;(2)达到6亿t换轨期后,直线段钢轨磨耗量普遍小于3 mm,远小于维修规则中侧磨16 mm、垂磨14 mm的限值要求;(3)大修所换钢轨廓形的磨耗对轮轨等效锥度影响均未超标准限值,说明钢轨磨耗对轮轨动态影响较小;(4)钢轨廓形垂磨中扁平状的磨耗对等效锥度影响相对较大,说明轨顶扁平状不利于行车舒适性和安全性。

The subway rail needs to be replaced when it reaches the overhaul period.In order to explore the relationship between the wear level of used rail and wheel-rail matching relationship,the influence of rail profile on the equivalent conicity was analyzed by measuring the profiles of used rails and simulating the matched wheel-rail equivalent conicity.The results show that:(1)It is reasonable and reliable to calculate the equivalent conicity by using UIC519 integral method and wheel-rail contact model in multi-body dynamics software UM.(2)While the million gross tons reaches 600,the rail wear is generally less than 3 mm in the straight line,which is far less than the limit of 16 mm for side wear and 14 mm for vertical wear according to the maintenance rules.(3)All wheel-rail equivalent conicity values of the used rail with profile measured are within the standard limit,which indicate that the rail wear has little effect on wheel-rail dynamics.(4)The flat vertical wear of the rail profile has a relatively large impact on the equivalent conicity,which means that it will not be conducive to the comfort and safety once the top of the rail is flat.