Abstract: The multi-pass conventional spinning includes the shaping stage and preforming stage. This paper focuses on the flange wrinkling prediction in the preforming stage. According to the deformation characteristics in the preforming stage, the assumptions that the inner side of the instability region at the flange is a simple support condition and the outside is a free boundary condition are proposed, and the deflection surface equation for describing the wrinkling wave shape that meets the boundary conditions is established. The prediction model of the flange wrinkling is developed based on the energy method. Combining the geometries and the stress fields in the conventional spinning numerical simulation, the flange wrinkling prediction in the preforming stage is realized. Compared with the spinning experiment in an aluminum alloy hemispherical component, the developed model can accurately predict the flange wrinkling in the preforming stage.

Key words: wrinkling; metal spinning; prediction model; aluminum alloy