Flexible Forming of Thin Aluminum Alloy Sheets
نویسندگان
چکیده
Flexible forming is a sheet metal forming process with the application of soft material tooling. In this study, flexible (silicone rubber, SR, and styrene butadiene rubber, SBR) and semi-rigid (polyamide 66, PA) polymeric materials were adopted to make several upper dies which were used in combination with aluminium lower dies. Stamping operations were performed on a thin aluminium alloy sheet with two different geometries: a cylindrical cup and a straight rib. Small samples were produced and analysed by visual inspection and profilometry. Forming forces were measured during process so as to compare the effect of the different die materials on the process performances. Numerical analyses were also used for a better understanding of the forming procedure. Best results were obtained in the case of semirigid dies, whereas flexible dies led to sheet tearing, and generally exhibited poor durability.
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