Numerical Simulation Of Railcar Coupler And Optimization Of Casting Technique

Currently F coupler has become the most widely used freight train couplerin our country. However, due to various porosityshrinkage, domestic F coupler’sperformance is far from meeting the domestic needs.In this paper, freight train coupler, the development tendency of simulationof F coupler is reviewed. Then a physics experiment has been carried out tocalculate the interface transfer coefficient between grade E steel and resin bondedsand by means of Procast. Finally the interface transfer coefficient at1560℃-1300℃has been calculated as813.72W/m~2·K by the inverse deducingmethod. With the original casting parameters, the casting defects are detected onthe complicated main part of F coupler head.To supress the formation of defect, the pouring temperature and filling timeof F coupler are optimized. Simulations turn out that the pouring temperature andfilling time of F coupler can not effect the defects distribution within a certainrange. So the original casting parameters are not necessarily changed. Thepouring temperature should be selected between1540℃and1580℃and thefilling time should be selected between20s and25s.Then34numerical simulation experiments have been carried out tocomprehensively optimize the gating system and riser design. Simulations showthat porosity shrinkage with volume fraction larger than0.7%is basicallysupressed in F coupler. Macroscopic porosity shrinkage can no longer be foundin the optimized F coupler, which fulfills the requirements of the subject.