Experiments and simulation of shape and thickness evolution in multi-pass tube spinning

The primary objective of this study is to predict the geometric shape and thickness change during multi-pass tube spinning to a hemispherical shape. Interrupted spinning experiments are performed at room temperature on cylinders of 6061-O aluminum alloy. The shape and thickness after 2, 4, 6 and 8 spinning passes are measured. An axisymmetric finite element model of the tube spinning experiments is described. Uniaxial tensile tests are conducted for the development of the material model. The post-necking hardening curve of the material is identified using a hybrid experimental-numerical method. The stress-strain identified in this way is fitted to a combined Swift-Voce model. The results of the simulation are compared to the interrupted spinning experiments. Good agreement is obtained on the shape evolution in multi-pass spinning. The effect of roller paths on shape and thickness change during multi-pass tube spinning targeting a hemispherical shape with uniform thickness were predicted by axisymmetric modeling and validated with experimental results.