Oblique Bending Control of Four Roll Bending for Profile of 2099-T83 Al-Li Alloy

Variable curvature 2-profile of 2099 Al-Li alloy is important truss of Chinese independently developed large airplane C919, and four roll bending forming is the main method to manufacture this kind of part. Due to the high specific strength of Al-Li alloy and asymmetric structure of 2-profile, compared with profile of conventional aluminum alloy, 2-profile of Al-Li alloy is extremely prone to oblique bending. Therefore, four roll bending process of 2-profile was simulated by finite element software ABAQUS. Effect of clearance between rollers and profile, clearance between bottom roller and profile's down surface in vertical direction, displacement in X direction of left and right rollers was researched on oblique bending during four roll bending of 2-profile, and the best roll bending process parameters was confirmed. Roll bending process experiment was carried out based on it. The results show that 0.2 mm for clearance between rollers and profile, 0.3 mm for clearance between bottom roller and profile's down surface in vertical direction, 1.5 mm for displacement in X direction of left and right rollers can effectively solve the problem of oblique bending for roll bending of 2-profile. © 2017, Science Press. All right reserved.