Effect of deformation condition on axial compressive precision forming process of tube with curling die
Effect of Deformation Condition on Axial Compressive Precision Forming Process of Tube with Curling Die

The effect of the deformation condition on the axial compressive precision forming process of tube with curling die was investigated by using a rigid-plastic FEM. The results show that the forming accuracy depends mainly on geometric condition r(ρ)/d(0), little on tube material properties and friction condition, the relative gap Delta /2r(ρ) of double-walled tubes obtained decreases with increasing r(ρ)/d(0), and there is a parameter k for a given t(0)/d(0) or r(ρ)/t(0), when r(ρ)/d0 > k, Delta /2r(ρ) < 1, otherwise /2r(ρ) > 1.