75N钢轨的试验研究

Experimental Research on the 75N Rail

研究目的:针对大秦重车线钢轨铺设初期轮轨匹配不良的问题,设计出新轨头廓形75N钢轨,通过仿真计算对比分析了75 kg/m钢轨优化前后的接触状态及几何关系,并进行了75N钢轨在大秦重车线的试铺试验。研究结论:(1)75N钢轨显著改善了轮轨关系,轮轨主要接触位置更处于轨头踏面中心区域,轮轨接触应力大幅降低;(2)75N钢轨无论预打磨还是未进行预打磨,在直线上钢轨光带均较为居中,轨距角未出现肥边和剥离掉块,轨面光洁,钢轨使用状态较好;(3)在曲线上使用,75N钢轨均未出现轨距角肥边,表现出具有良好的轮轨接触关系;(4)该研究成果可应用于重载铁路钢轨的使用方面。

Research purposes： 75 kg/m rail with new profile （75N rail） is designed for adverse match the wheel -rail of the early stages of rail use in Datong - Qinhuangdao railway heavy line. The contact state and the geometry relation are compared and analyzed by simulation before and after optimization of 75 kg/m rail, 75N rail is tested in Datong- Qinhuangdao railway heavy line. Research conclusions： （1） 75N rail can significantly improve the wheel- rail relationship,The wheel- rail contact position is in rail head tread center area, The wheel -rail contact stress decreases sharply; （2） Regardless of pre -grinding or not pre -grinding, the wheel - rail contact position is centered in a straight line. Gauge corner does not appear the crushing and shelling, Application of The new profile of 75N rail is in good condition; （3） When 75N rail is used in curve, gauge corner does not appear the crushing, it shows good relationship of wheel - rail contact. （4） This research results can be used in rail of heavy haul railway.