Three-dimensional Finite Element Simulation Analysis Of U71Mn Heavy Rail BD2Rolling Process

With the rapid development of high-speed rail technology in China andabroad,quality requirements of high-speed heavy rail is increasingly strict.Theproductive process is a complex process with high temperature dynamic and transientand there are many passes and alien reversible rolling groove and the deformation isvery complex.The rolling technological parameter is very important to texture propertyand size accuracy.Aimed at BD1and BD2reversable mill of a large steel plant, rollingprocess of60kg/m BD1and BD2U71Mn heavy rail is numerically simulated throughnonlinear finite element software ANSYS/LS-DYNA.The data transmission isaccurately realized through using vertical miller replacing pass tilting and translatingroller to realize the next pass rolling.The result of Three-dimensional finite element simulation shows that:The filling ofdifferent pass is good; the calculated results of temperature and rolling force areconsistent with the actual producing;double-drum shape occurred on the side of rolledpiece during BD1and there is no rolling deformation in the heart part and Metal Flow onthe surface layer is faster than in heart part.From the distribution of equivalent stressand equivalent strain of deformation area and exit section, the equivalent stress andequivalent strain of head waist and base is different。the max equivalent stress exists inhead and the max equivalent strain exists in waist.The nodes at the corner section ofhead have great lateral displacement but the location of nodes at the bottom doesn’tchange a lot.The metal flows along longitude and height at the bottom.The metal inwaist flows along longitude and width at the bottom.The nodes in heart flow to thebottom.The nodes in waist flow faster along longitude than the nodes in head andbottom and the locations of nodes on cross section changed in space.The study results can provide the basis for the optimizing design of the groove ofBD2,the calculation of the force energy parameters and the evolution of microstructure.