钢轨打磨对重载铁路小半径曲线钢轨波磨的影响

Influence of Rail Grinding on Corrugation of Small Radius Curve Rail in Heavy Haul Railway

针对朔黄铁路半径400 m曲线区段的钢轨波磨问题实施了个性化钢轨廓形打磨,基于C80货车和曲线线路参数建立了车辆-轨道耦合动力学模型,仿真研究了钢轨打磨前后各项车辆动力学性能、曲线通过能力,给出了波长200~500 mm时打磨前后波深安全限值。结果表明:钢轨打磨很难彻底消除波长300 mm以上的波磨,但可以大幅降低轮轨力、轮轨蠕滑力、车体和侧架振动加速度等动力学指标;钢轨打磨后曲线上股轮轨接触形式由轨顶和轨侧两点接触变为贴合式接触,且上下股轮径差增大,车辆通过能力和安全性提升,钢轨磨耗指数显著降低,相较打磨前波深安全限值提升约0.2 mm。

Aiming at the problem of rail corrugation in the 400 m radius curve section of Shuozhou-Huanghua railway,a personalized rail profile grinding was implemented.Based on the parameters of C80 freight cars and curve lines,a vehicle-track coupling dynamic model was established.The vehicle dynamic performance and curve passing capacity before and after rail grinding were simulated,and the safety limit of wave depth before and after rail grinding was given when the wavelength is 200~500 mm.The results show that rail grinding is difficult to completely eliminate the corrugation with wavelength above 300 mm,but it can greatly reduce the wheel rail force,wheel rail creep force,vehicle body and side frame vibration acceleration and other dynamic indicators.After rail grinding,the contact mode of wheel rail on curve upper track has changed from two-point contact between rail top and rail side to fitting contact,and the diameter difference between upper and lower tracks has increased,the vehicle passing capacity and safety have been improved,and the rail wear index has been significantly decreased,which is about 0.2 mm higher than the safety limit of wave depth before grinding.