Vibration aging method for lowering and homogenizing residual stress generated after turnout switch rail quenching

Abstract

The invention discloses a vibration aging method for lowering and homogenizing residual stress generated after turnout switch rail quenching. The method includes the following steps that a finite element model of a turnout switch rail is established, and the quenching process is simulated according to the finite element model so as to obtain a turnout switch rail residual stress distribution cloudchart after quenching is completed; free mode analysis is carried out on the finite element model to determine the positions and corresponding natural vibration frequencies of three fixed supportingpoints; constraint mode analysis is carried out on the finite element model according to the fixed supporting points to determine the positions and corresponding inherent frequencies of excitation points; harmonic response analysis is carried out on the finite element model according to the fixed supporting points, the excitation points and the residual stress distribution cloud chart, and actualexcitation force and actual excitation frequency with the highest residual stress eliminating rate are obtained; and vibration is exerted on the turnout switch rail to treat residual stress. The method has the advantage of being capable of effectively lowering overall residual stress after quenching of the turnout switch rail.

Description

technical field [0001] The invention belongs to the technical field of train track manufacturing, and in particular relates to a vibration aging method for reducing and homogenizing the residual stress of a turnout point rail after quenching. Background technique [0002] After quenching, the residual stress of the turnout tongue rail is relatively large, and warping deformation occurs. Residual stress needs to be eliminated, and then it can be used on the road after straightening and top adjustment. [0003] In the existing technology of eliminating track residual stress, the exciter needs to sweep the switch tongue within a certain frequency range, and the acceleration collector is used to determine the maximum acceleration position and record the frequency at the maximum acceleration position. The above scheme cannot be well determined Sweeping range, although the larger the sweeping range, the better, but the longer the sweeping time is. [0004] Such as figure 2 As s...

AI Technical Summary

Problems solved by technology

The position of the support point and the excitation point of the above method is judged based on experience, and it is impossible to accurately locate the point where the displacement deformation is the smallest and the point where the displacement deformation is the largest, which affects the elimination effect of residual stress during vibration aging

At the same time, the above method can only eliminate a part of the residual stress in the middle of the switch point rail, and the residual stress in the outward part of the two support points at the bottom of the rail, that is, the tip and heel of the switch point rail, cannot be reduced. The tip and root part will be warped, and the residual stress in the area of ​​the tip and root part needs to be dealt with

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