In response to the shortcomings of previous rail surface reparative grinding that relied on the accuracy of the rail profile to determine the grinding strategy and ignored the wheel-rail contact state after grinding,a grinding wheel arrangement strategy based on the wheel-rail contact characteristics of the rail grinding profile is proposed.Based on the principle of reparative grinding the rail surface,the relationship between the grinding wheel arrangement strategy and the reconstruction of the rail profile after grinding is determined.Three typical grinding wheel arrangement strategies,namely"rail top to both sides","inner side to outer side",and"two sides to rail top",are used to establish the rail profile model obtained after grinding.Then,a three-dimensional finite element simulation model of wheel-rail contact is used to analyze the high contact stress and low fatigue cycle distribution characteristics of the rail surface under wheel-rail contact load.The results indicate that changes in the reparative grinding strategy of the rail surface significantly affect the wheel-rail contact characteristics after grinding.Under the condition of a 23 t axle load,three typical grinding wheel arrangement strategies were used to polish the reconstructed rail profile.The maximum contact stresses between the rail surface and the wheel were 863,1 255,and 904 MPa,respectively,and the minimum strain fatigue cycle times were 1.77×105,9.97×104,and 1.64×105 times,respectively.The maximum stresses experienced by the maximum contact stress profile on the rail surface were 1 241,1 376,and 1 270 MPa,respectively.The minimum strain fatigue cycle times were 9.96×104,8.60×104,and 9.80×104 times,respectively.The wheel-rail contact state after grinding the rail using the"rail top to both sides"grinding wheel arrangement strategy is better than the other two strategies.
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