Abstract Using self-developed automatic control spinning equipment, the shear spinning process under 20°, 30° and 40°of roller mounting angle was carried out on the thickness of 0.5 mm for 1060 aluminum alloy to study the characteristics of microstructure, wall thickness reduction, wall surface quality defects. The results show that the roller mounting angle obviously affects on the spinnability of conical spun parts with thin wall, however, it hardly affects their microstructure evolution. When the roller mounting angle is 30°, i.e. in other words the optimal mounting angle is equal to the half cone angle of the core mold. And the conical wall height of the conical spun part is the highest, and the thickness of the conical wall is uniform, the surface is smooth, and there is no obvious appearance defect. It is found that whether the roller mounting angle is larger or smaller than the half cone angle of the core mold, it will lead to negative deviation from the spinning, even if it does not reach an increase of 90°, only an increase or decrease of 10°, the conical spinning part soon appears circumferential cracking of the sidewall, and the phenomenon of material accumulation in front of the cracking all appears.
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