Abstract
When a sheet is drawn over a die corner, the sheet is subjected to stretch bending and subsequent unbending. This paper deals with the deformation behavior of sheet metal laminates in the stretch bending/unbending process. For two-ply laminates of aluminum/SUS430 and three-ply laminates of SUS304/aluminum/SUS430, the behavior of sheet thickness change and the loss of stretching force (i. e. the plastic energy dissipation) in the process are discussed based on the experimental results and the corresponding numerical simulations. The results show that the amount of change in sheet thickness increases with decreasing die radius. Especially for the two-ply laminate of aluminum/SUS430, the deformation behavior is strongly affected by the sheet-set condition of whether a die-contact metal is aluminum or SUS430. The loss of stretching force is affected by the die radius and the friction characteristics of the die-contact metals.
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