Research On Slow Wear Measures Of Thin Flange Wheel Profile

Wheel-rail relationship is one of the most important problems in rail transit system,among which the contact between wheels and rails has been paid much attention by scholars at home and abroad.It has become a huge problem to ensure the safe,stable and least worn operation of service vehicles.Therefore,in order to ensure the running quality and safety of high-speed trains in our country,this paper uses four wheel profiles of rims thickness to simulate the dynamics first,then combines finite element method to study,and then obtains the corresponding measures to slow grinding.The main contents and results of this study are as follows:(1)The vehicle system dynamics model was established,and the simulation analysis showed that there was no obvious difference in the safety and stationarity of the four wheel types,LMa-standard,LMa-30,LMa-28 and LMa-26.(2)In this paper,the friction coefficient,track slope,curve radius and train speed of the wheel surface with thin rims are analyzed.When the friction coefficient is reduced to 0.1,the vehicle can reduce the wear and tear of the wheel and prolong the service life of the wheel on the basis of safe and stable operation.The LMa-28 and LMa-26 wheel profiles are suitable for driving at 1/30,1/40 and 1/50 on the track bottom slope,while the LMa-standard and LMa-30 have the least comprehensive evaluation index and the best comprehensive performance when the track bottom slope is 1/10.The larger the radius of the curve,the lower the comprehensive evaluation index,the safer,smoother and less abrasive the train is.The vehicle is in good condition when the four wheel profiles are traveling near the equilibrium speed.At the same time,when the rims are thinned and driven at different speeds,the comprehensive index is higher,namely,LMa-28 and LMa-26 should be avoided at high speed.(3)Using the finite element ABAQUS analysis software,the wheel shape under different rims thickness is analyzed,and the contact state between wheels and tracks is different when the wheel shape is different.The friction force between wheels and tracks can be reduced effectively by reducing the friction coefficient.The amplitude of LMA-30 and LMA-28 can change more obviously after the change of friction coefficient.With the increase of the transverse shift,the contact characteristics of the four types of wheels under the surface of the wheel change to a certain extent,and the friction force is the biggest.(4)By analyzing the wheel wear law of four wheel profiles which change the friction coefficient between wheels under different running mileage,it can be seen that with the increase of running mileage,the rims thickness and the change trend of q R value are consistent.After the friction coefficient of the wheel with four rims is reduced,the wear and tear at the rims is obviously reduced.Wheel profiles with four rim thicknesses LMa-Standard,LMa-30,LMa-28,and LMa-26 showed approximately the same amplitude reduction in rim thickness and q R when the friction coefficient decreased from 0.6 to 0.1.