The Research On Key Technology Of Forming Hollow Railway Axle In Multi-wedge Cross Wedge Rolling

At present, with the rapid development of high-speed railway and the practicing of"four vertical and four horizontal" high-speed railway passenger transport network iscompleted. In2020, the ownership of high-speed trains will reach8000and the demand ofthe hollow railway axle will more than1million, the associated specialist said.Nowdays,most of factories are use free forging and precision forging to forming thehollow axle, and here comes a problem that those forming technologies are in lowproduction efficiency but high cost. Further more, the key technology of precision forgingis grasped by the foreign companies, the research level in our country is on the elementarystage. The multi-wedge cross wedge rolling (MCWR) is an advanced precise formingtechnology, which is one of the best way to forming the long axle.It has manyadvantages，such as high production efficiency, saving material and reducing costs.Therefore, intensive study on forming hollow railway axle with multi-wedge cross wedgehas important theoretical significance and realistic value which can promote thisenvironment friendly technology on our country and localization the production of thehollow axle.Based on the latest hollow RD2axle and the feasibility of condition theoreticalanalysis of wedge rolling hollow axle finite element model, we use the Pro/E software asmodeling tool and use the large finite element method software DEFORM3d to buildfinite-element model of the multi-wedge cross wedge rolling on hollow railway. Aftersimulation analysis, the stress and strain of hollow axle was studied, the wedge rollingforming force parameters change rule was concluded and the smooth of long axis ofhollow axle period of the transition was studied. Also, the effects of process parameters onthe thickness of the hollow axle was researched to guarantee the normal service ofhollow axle on high-speed trains. In this paper, through two aspects of theory andexperiment research and the combination of the results of the simulation, and the wedgerolling hollow axle into the experimental verification, the feasibility of the results onwedge rolling of hollow axles is feasible.In this paper, the foundation of mass production and specialization on the wedgerolling of forming hollow axle was established.