Study on spinning-bending incremental forming characteristics of aluminum alloy variable-diameter tube by FE simulation
A double-roller flexible bending die for the spinning-bending incremental forming was designed,which can apply circumferen-tial restraint to the tube and enable adaptive rotation during the forming process.Compared with the traditional circular type single-roller bending die,the new type of double-roller flexible bending die can effectively reduce the bending force,improve the forming stability and suppress the cross-section deformation of the tube.On these bases,the whole-process finite element model for the spinning-bending incre-mental forming of aluminum alloy tube was established.By comparing with flexible bending forming,the coupling effect laws of spinning-bending deformation on the forming results were analyzed.It is found that the introduction of bending step on the basis of spinning causes a certain degree of cross-section deformation and uneven wall thickness.The introduction of spinning step on the basis of bending reduces the cross-section deformation of the bending section,increase the difference between the intrados and extrados wall thickness,increase wrinkling tendency,and reduce the springback after forming.
variable-diameter bend tubespinning-bending incremental formingdie designforming law
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