In order to reduce the overall weight of pipeline systems and increase available space

the application of small bending radius pipes is becoming increasingly widespread. However

in free bending forming technology

forming small bending radius pipes is more difficult. Based on ABAQUS finite element simulation

this paper establishes a finite element model for the free bending forming of small bending radius pipes

analyzes the free bending forming process of small bending radius pipes

and forms pipes with a relative bending radius less than 2 by adding additional bending moments. The effectiveness of the finite element model is demonstrated through experiments. By means of finite element simulation and free bending test verification

the corresponding relationship between the process parameters of the pipe for free bending die forming and additional bending moment forming and its forming radius was obtained. The experimental results show that

the minimum relative bending radius achieved by the bending die is 2.07. By increasing the additional bending moment for forming

the minimum relative bending radius can be reduced to 1.75.