50AT尖轨感应淬火的数值模拟

Numerical simulation of induction hardening of 50AT switch rail

通过对尖轨轨头进行中频感应淬火处理,可提高其强度、耐磨性及延长尖轨寿命。轨头淬火后,会产生较大的残余应力。通过建立50AT尖轨模型,进行淬火模拟仿真得到淬火后残余应力分布,并采用盲孔测应力法对比验证应力结果。结果表明:轨底中部残余应力值较大,尖端部分残余应力值较小;选择轨底相同位置测点,得到模拟仿真应力值与实测应力相差较小。试验结果可用于指导尖轨淬火后残余应力的消除及振动时效时激振器的放置位置。

The strength,wear resistance and service life of switch rail can be improved by medium frequency induction hardening. After the rail head is hardened,there will be a large residual stress. Through the establishment of 50 AT switch rail model and the simulation of hardening,the distribution of residual stress after hardening was obtained,and the stress results were compared and verified by the method of blind hole stress measurement. The results show that the residual stress in the middle part of the rail bottom is larger,and the residual stress in the tip part is smaller. The difference between the simulated stress and the measured stress is smaller by selecting the same measuring point at the rail bottom. The test results can be used to guide the elimination of residual stress after hardening of switch rail and the placement of vibration exciter during vibration aging.