Study On The Numerical Simulation Of The Cooling Process Of U75V Heavy Rail

Railway transportation has been plays a very important role to economic development in China. Along with the rapid development of national economy, high-speed railway quickly became the general trend of railway development. Heavy rail as an important part of a railroad, is suffering bigger impact load, the load is bigger especially in high-speed railway, the quality of heavy rail Directly influences the development of high-speed railway and the safety of railway transportation.Heavy rail can produce complex bending deformation process during cooling in the comprehensive function of solid phase and material thermal physical properties changing with temperature. Heavy rail can produce contraction after cooling, the irregular distribution of heavy rail cross-section shape can lead to the irregular contraction of dimension. The initial condition and boundary condition can influence the cooling process of heavy rail also.This paper established the three-dimensional finite element model of the U75V heavy rail, simulated the cooling process of heavy rail using Ansys as the simulation software, Analysis the change rule of heavy rail temperature field in cooling process(especially the change rule of temperature in solid phase transition stage), the distribution rule of residual stress, the change rule of section size and the bending deformation rule(especially the bending deformation rule in solid phase transition stage), got the influence of initial temperature and convection coefficient on the temperature field, the stress field and the deformation rule by changing the initial condition and boundary conditions of heavy rail cooling process.The temperature difference of rail head and rail bottom experienced complexd change processes of increasing, and decrease, then increases, again decrease. Heavy rail experienced the complex bending deformation process, and bending over rail head in the final. Each part section size shrinkage of heavy rail is obviously non-conformance after cooling. Reduce the initial temperature and reduce the air flow rate of cooling can reduce the curve degree of heavy rail after cooling, reduce section size shrinkage rate of heavy rail after cooling. This paper can provide the basis theory and the reference suggestion to the research of preflex craft and the design of cold-bed.