Research On Power Spinning And Flaring Of TA15Titanium Alloy

For its light-weight, high specific strength, corrosion and heat resisitance, titaniumalloy was widely used in aerospace and military equipment industry. During the powerspinning, the workpiece was deforming point by point, deformation zone was in thetriaxial compressive stress state, which improved the plastic deformability of difficult toform materials. So, it suitable for forming the rotational parts of titanium alloy. Owing toits low elastic modulus, serious springback, the geometry precision was difficulty tocontrol during the forming of conical workpiece. However, if using flaring, the defectcould be effectively controlled and got high accuracy of conical parts. In this paper, theforming technology of cylinder-conical composited structural parts of TA15titaniumalloy was researched, combining the power spinning and flaring. Designed reseanableforming program and spinning path to got variable thickness spinning tube; the conicalpart could be more uniformity by means of flaring with variable thickness tube blank.In this paper, the power spinning of cylinder workpiece and flaring process of TA15titanium alloy were simulated using the ABAQUS/Explicit. The deformation mechanism,stress-strain state in the deformation zone was analyzed, the roller contact state andmaterials uplift defects evolution mechanism during power spinning were also be studied.The stress-strain state and thickness strain evolution during flaring were analyzed, andthe deformation zone were divided into different parts, got a thickness strain boundary indeformation zone, this provides an theoretical basis for the design of variable thicknessblank of flaring.Based on the result of simulation analysis, the power spinning and flaringexperiment was studied, the result show that, using the scheme T1, thickness of6mminitial blank, got the variable thickness tube by power spinning with reasonable spinningpath, After flaring with the variable thickness blank, the conical workpiece thicknessuniformity became better. The research on the microstructure and properties duringpower spinning and flaring found that, the material grain axial and circumferentialstrengthening during power spinning and the circumferential deformation during flaringcontinue the strain trends during spinning. combined the power spinning and flaringtechnology could obtain precision geometric, better microstructure and properties,uniform thickness conical parts of TA15titanium alloy.