| Citation: | FAN X，CHENG Z H，LI S X，et al. Effect of critical eccentricity on forming accuracy of tubes in 3D free bending process[J]. Journal of Beijing University of Aeronautics and Astronautics，2024，50（1）：208-215 （in Chinese） doi: 10.13700/j.bh.1001-5965.2022.0221
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The tube is less limited during 3D free bending, and the eccentricity of the bending die determines the radius of the bend and the form of the bending axis. In order to accurately process the shape of the tube and improve the forming accuracy during the free bending process, a new free bending mechanical model was established for critical eccentricity. The influence of different friction coefficients and material parameters on the change of critical eccentricity were studied by using the finite element simulation and free bending tests. The findings have demonstrated that the experimental findings and the fitting outcomes of the
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