Numerical Simulation Of At-Rail Correction

Switch is the rolling stock of railway track will link to or from an road track over the other important equipment,it is directly related to the efficiency of rail transport and road safety. At the same time switch is also the weakest part of track structure, and a major factor that the impact of traffic safety and speed limits. Because of its complex structure and the technological difficulties, with the EMU and train control high-speed railway in China become the three core technologies.AT-rail is a special section of the rail-type dwarf short, mainly for the manufacture of the switch rail, movable rail, rail expansion joint products. With the accelerated pace of modernization in China, high-speed railway transportation, heavy demands increasingly urgent.Since 1997, several national railway speed, especially under construction Qinshen and future high speed railway track on the turnout increasing the use of performance requirements, the original U71Mn60AT track has not suited to the urgent requirement to improve turnout track the strength to adapt to the rapid development of railway construction.AT-rail in the research is high-strength rail material, because the rail material of AT-rail is special, for more realistic simulation results, the material on the AT-rail tensile test carried out to determine the performance parameters of the material.The issue used the ANSYS/LS-DYNA finite element analysis software, The straightening process of AT rail is a very complex three-dimensional elastic-plastic deformation of metals, using large deformation elastic-plastic finite element method AT rail straightening process is simulated.Task is to simulate the AT rail straightening process, and establish AT-rali the upper and lower straightening roller model, simulation the switch of the nine-roller straightening of the motion state, the research process used in the actual production volume range of straightening roller pressure, initial set of reduction, according to simulated results, determine the correct roll by analyzing a set of optimal reduction rate.