Study On Damage To Wheel Shaft Mating Surface During Curve And Turnout Operation Of Heavy-haul Freight Train

In the process of modernization,China continues to develop in the direction of heavy loading,and the burden on wheels and axles is also increasing,especially in the process of heavy load trains in the curve section and turnout section,the train will be subject to greater centrifugal force.When the creep guide is not enough to meet the wheel steering,the wheel flange will also collide with the track to produce the wheel flange guide,which makes the fretting damage between the interference mating surfaces more serious.Different from the composition structure of other trains,the degree of micro-motion damage of the interference mating surface of the axle is difficult to be observed intuitively,which also leads to the failure of the wheel and axle very suddenly,which brings many hidden dangers to the safe operation of heavy-haul trains.In order to quantitatively predict the fretting damage of the interference mating surface of the axle of heavy-haul trains,the three-dimensional contact model of axles,wheels and tracks is first established in ABAQUS,and the simulation model of the straight section of the heavy-haul train is completed,and the simulated contact parameters that are compatible with the operation of the heavy-haul train are selected through the study of the contact parameters.The simulation model of the straight section of the heavy-haul train is optimized to complete the simulation model of the train passing through the curved section.The influence of the train on the stress distribution and fretting slip of the interfere nce mating surface under complex working conditions such as ultra-high outer rail,differe nt axle load,different wind load,different track curvature radius,and different speed was studied.On the basis of the curve section of the train,the turnout track was established to change the working conditions of operation,and the influence of wheel flange guidance on the stress distribution and frettage slip of the axle when the heavy-haul train passed through the turnout was studied.By extracting the data of stress distribution and micro-dynamic slip of the wheel shaft interference mating surface of the straight,curved and turnout sections of heavy-haul trains,a wear depth calculation model is established based on the Archard wear method,and the wear depth of heavy-haul trains passing through the shaft mating surfaces of straight segments,curved sections and turnout sections is calculated,and the effects of wind load,axle load,speed,outer rail ultra-height,track curvature radius and the number of wheelset rotation turns on the wear depth of the shaft mating surface are analyzed.Finally,the wear depth of heavy-haul trains passing through the shaft mating surface of the Daqin Line railway was quantitatively predicted.