Abstract
A multistage incremental sheet metal bulging machine using spherical and cylindrical rollers has been developed for vertical wall surface forming of rectangular shallow shells. Multistage incremental forming comprises three operations : bulging with a spherical roller, right-angle forming and flattening with cylindrical rollers. The hand-operated bulging machine formed a vertical wall surface which is highly precise and preferred by designers. A method of calculating for the approximate distribution of thickness strain and the maximum bulging height of the rectangular panel was proposed using the fracture limit obtained from the incremental bulging test with a ball roller and a geometrical plane-strain deformation model with a constant strain gradient. The predictions for the rectangular shell were in reasonably good agreement with experimental values for the annealed aluminum sheet.
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