Less Flash Die Forging Forming Technology Research About60AT Ending Part Of Touque Rail

In recent years, with the high-speed development of rail transportation, train hasgotten many reform in speed-up. To meet the development of high-speed heavy-dutyrail transportation, rail has to develop toward heavy rail gradually, the correspondingpoint of the tip rail has been produced by rail of special section (AT tip rail), thematerial is always selected U75V steel or U71Mn steel.This paper mainly studies theforging forming process of60AT-type orbit which is used for high speedrailway.Because of the AT-type orbit will has a great change in cross-section shapeduring the process of forging-forming, its forging process is very complex, if use thetraditional way of production test to study, it will make the process development cyclelong and will waste a lot of materials on testing. So, in this paper, we use UG modelingsoftware and DEFORME three-dimensional numerical simulation software, to studyand design the forging forming process of60AT-type side rail of U71Mn steel material.To make the simulation results more close to the production practice, in this topicresearch,we test the High temperature hot compression state of the flow stress ofU71Mn steel with Gleeble-1500thermal simulation experiment machine, to study theinfluence of different deformation parameters this material.Built the DEFORMnumerical simulation material model of this material,then we can use this model to dothe numerical simulation of forging forming of60AT-type orbit straightly,so that makethe forming simulation more reality.Designed the forging process and die structures of each forging step for the forgingforming characteristics of60AT-type orbit. Modeling the moulds and billet with the UG3-D modeling software. Do numerical simulation to the designed die forging formingprocess of60AT-type orbit with DEFORM-3D numerical simulation software, modifiedthe die structure in time, in view of the forming defects that is reflected by the result ofsimulation, and finally determine the die structure of which can make sure about a goodparts forming.Optimized the transition fillet radius of rail-foot of forging die,to reducethe forging flash.Observe the stress, strain and temperature field distribution, and the forming loadchanging of each die forging step, during the die forging forming process of60AT-typeorbit. Analysis the reason caused these distributions and whether this process rationality,through a series of contrast simulation experiment(including different billet length: 620mm,630mm,640mm,660mm,650mm,670mm,680mm; different frictioncoefficient:0.1,0.2,0.3,0.4,0.5), this paper analyses the influence of different billetlength, different friction coefficient to the maximum forming load and length ofwell-filled forming parts. Thus choose appropriate billet length and appropriate frictioncoefficient for the die forging forming process of60AT-type orbit, so as to save materialand reduce requirements of the equipment on its load purpose.Through the research on this subject, provides a reliable basis for the forgingforming practical production and related die designing of60AT-type orbit, can help savethe time for product development cycle, optimizing the forming process, reduce cost,and so on. It offers a good reference to the practical production.