矫直工艺对热处理钢轨残余应力的影响

Influences of Straightening Process on Residual Stress of Heat-treated Rails

为了研究钢轨矫直工艺与残余应力的关系,结合ABAQUS有限元分析软件,模拟钢轨矫直过程中钢轨应力应变情况。对多种钢轨矫直工艺方案进行模拟分析,确定最优矫直工艺方案,并结合现场工艺调试的结果进行研究。结果表明:各矫直方案的最小弹性芯均处于第Ⅱ变形区内,所以降低2^(#)、4^(#)矫直辊压下量能有效降低钢轨残余应力,并且降低钢轨矫直速度也能有效降低钢轨残余应力。

In order to study the relations between straightening process and residual stress of rails,the stress-strain situation of rails during straightening process is simulated combining with the ABAQUS software of finite element analysis.Various straightening process plans of rails are with simulation analysis to determine the optimal one and are researched combining with the results of on-site process debugging.The results showed that the minimum elastic core of each straightening plan was within deformation zoneⅡ,so the residual stress of rails could be effectively reduced by reducing the rolling reduction of 2#and 4#straightening rolls as well as straightening speed of rails.