铝合金带筋板柔性多点模渐进压弯成形工艺仿真与实验

A new forming technology of flexible multi-point mold progressive bending was proposed in view of the forming problem of instability and cracking component with thin thickness and high rib panel in roll-bending and compression-bending forming. The effects of height and thickness ratio, relative bending radius and loading mode on the deformation behavior, stress, strain and defects of flexible multi-point mold progressive bending were studied. The results show that the maximum tensile and compressive stress is decreased by 34.7% and 37.2% respectively compared with integral bending, and the deformation stability of the stiffened panel is improved. When the maximum height and thickness ratio is 7.5 and the minimum relative bending radius is 150, the maximum equivalent stress of the progressive loading forming part is 385.5 MPa, decreased by 3.65%, the maximum equivalent strain is 2.8%, decreased by 14.3%, and the forming force is 29.9 kN, decreased by 7.7%. In addition, the stress and strain distribution in the progressive loading mode is more uniform than that in the one-stage loading mode, which significantly improves the deformation stability of stiffened panel.