Advances in spinning of aluminum alloy large-sized complicated thin-walled shells

Large-sized complicated thin-walled aluminum alloy shells are the urgent needs of the development of aero-space high technology. Large-sized complicated thin-walled aluminum alloy shells with transverse inner ribs (LCTAASTIR) are one representative of those. But Multi-pass compound spinning of LCTAASTIR is one of the complicated plastic forming processes under the action of multi-parameters and their coupled effects. In this work, a modeling platform for the process was developed and some finite element models for the whole process were established. The characteristics of uneven deformation behaviors during the process and the forming mechanism of defects were investigated. The laws of different deformation behaviors on the quality of ribs were revealed, the decisive parameters on deformation behaviors were obtained, and the reasonable rules of blank, process and die parameters for the spinning process were determined. The achievements of this work are of significance to developing advanced theory and technology of precision plastic forming for LCTAASTIR.