Abstract: The formability of aluminum hyper-hemispherical shell deformed from 1060 plates by multi-pass draw-spinning is analyzed. The testing scheme of two-mould and two-roller are proposed, and different mandrels and rollers are designed. Circle-arc rollers of different work-radius test two shaping schemes by MC2000 playback spinning machine. The figuration of two-mould blanks is bad and the thickness of flange is reduced greatly. The figuration of two-roller blanks and inner moulding surface are excellent by the spinning process that the four quick feeding processes of R25 roller and four low feeding processes of R8 roller. The test results show that the figuration of two-roller can shape hyper-hemispherical shell by multi-pass draw-spinning aluminum blanks. Backward extrusion, expansion scab scale and corrugation are controlled by the spinning process of reducing rotational speed of mould, decreasing thinning ratio of pass and adjusting feed rate.

Key words: Hemispherical shell, Multi-pass spinning, Playback numerical control spinning, Spinning defect, Spinning process