Publisher : The Korean Society for Technology of Plasticity
DOI : 10.5228/KSTP.24.5.368
Title & Authors
Hydroforming of a Non-axisymmetric Thin-walled Tubular Component with Variable Cross Sections Kang, H.S.; Joo, B.D.; Hwang, T.W.; Moon, Y.H.;
Hydroforming of a non-axisymmetric thin-walled tubular component with variable cross sections was analyzed. In order to solve the sealing problem which occurred due to the thin and non-axisymmetric shape, the use of a lead patch on the punch, which had been successful in hydroforming of thin tubes, was evaluated. A lead patch was attached to the punch to solve the sealing problem, which was caused by the stress gradient in the non-axisymmetric shape. FEM and experiments were also performed to analyze these sealing problems associated with the punch shape and non-axisymmetric shape. Finally, the lead patch was attached at tube surface where intensive local strain concentration would occur to enhance the hydroformability. These methods were successfully used to fabricate non-axisymmetric thin-walled tubular component with variable cross sections that had previously failed during traditional hydroforming.