Research on deep drawing process of parabolic aluminum alloy part by one-pass rubber bladder hydroforming

Deep drawing of aviation aluminum parts is a difficult problem in the manufacturing field of aviation sheet metal parts. In this paper, a deep parabolic 2A11-O aluminum sheet part was taken as the target to studies the problem of difficult coordination between wrinkling and fracture in the one-pass forming process of rubber bladder hydroforming. Material performance testing showed that 2A11-O aluminum sheet has a significant Bauschinger effect. The Chaboche hardening model was used to construct a plastic material model, and finite element simulation was used to simulate the forming process, providing guidance for the design of forming processes. Due to the narrow forming window of 2A11-O aluminum sheet, the forming results are highly sensitive to the loading path and lubrication state. After careful experimental study, the forming process of the part with rubber bladder hydroforming was successfully realized by designing the loading curve in sections and lubricating the surface of the sheet in sections. The design ideas and lubrication methods used in this study can provide reference for the exploration of the same type of technology.