3D FEM Analysis For Ring Rolling Process Of Difficult-to-deformation

As one kind of crucial parts used in aircraft engine, rings are usually made of super alloy or titanium alloy counting for their comprehensive property. Therefore, the qualitative properties and technique of manufacture for the ring have a strong influence on improving the development of aircraft engine in terms of mechanical property, service life, low cost of research and development. Rings produced by ring rolling process have much predominance as following: densified structure, high tensile and ductility which can't obtain by casting process or other manufacturing engineering. Now, rings produced by ring rolling process have been the main source of ring blank for the force bearing ring in the aircraft engine.In the research of ring rolling process, three-dimensional numerical simulation is the effective measure in recent years since the particular complexity of the ring rolling process. This paper aims at researching the critical problem in the ring rolling process. Results as following:This paper investigated the variable regular pattern in kinematics of the radial and axial ring rolling through the combination of theoretical analysis and trials, building up the new computing method of instant diameter, growth rate of diameter, distribution of deformation account, matching rotation speed of taper. Compared with trial results, those new computing method is primary accurate.The FEA software LS-DYNA is employed, computed results indicated that the computing method and model is more effective compared with other FEA software on the precondition same computing accuracy. Those crucial technique problems, definition of material property, meshing technique, contact mode, friction and contact heat transfer on boundary, have been resolved by particular resolving method. This model which can reflect the objective process of radial and axial ring rolling has been employed in GH4169 alloy ring procedure.According to the simulation results, vary regular patterns of mesh, dimension and shape in the radial and axial ring rolling process have been investigated. The reason of 'fish tail' has been analyzed as well. Distribution of temperature, equivalent plastic strain and radial and axial rolling force have been quantitatively analyzed in the whole process. Influences of different radial and axial feeding speed on the radial and axial rolling force, growth rate of diameter and temperature have been systematically analyzed and proved by trials. Computing and tested results indicated that radial and...