Abstract
AbstractThis research investigates the influence of axial feed rate on shape and thickness changes in multi-pass, mandrel-free tube spinning for producing a hemispherical shape at room temperature. The target shape is formed experimentally by 7 spinning passes from annealed, pure aluminium AA1070 tube. The experiments are conducted with two different axial feed rates, i.e. 2 and 7.5 mm/rev. It was found that increasing the axial feed rate generates lower elongation and higher thickness change. In every experiment, the tube wrinkled at some point during the process, due to the high radial feed. A 3D elastic–plastic finite element (FE) model of the multi-pass tube spinning process is described. The influence of the axial feed rate on axial wrinkling, tube elongation, and thickness change is discussed through the comparison between experimental and FE prediction results.KeywordsTube spinningMulti-passAA1070-OHemispherical shapeAxial feed rate
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