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최성기(S.K. Choi),조이석(I.S. Jo),김봉준(B.J. Kim),문영훈(Y.H. Moon) 대한기계학회 2002 대한기계학회 춘추학술대회 Vol.2002 No.4
Manufacturing technologies for various automotive components such as radiator support, body and frame structure have been developed by using hydro forming technology. The cross-section of the axial feeding punch was manufactured in a rectangular shape to prevent crackings and increase the hydroformability of tubes, But the leakage of fluid at the comer parts of the rectangular tube has caused trouble in increasing internal pressure for the hydroforming. To solve this problem, the lead strip and the O-ring were applied as sealing material to prevent leakage, and the operational results are compared with each other.
김동규(D.K. Kim),김봉준(B.J. Kim),최성기(S.K. Choi),문영훈(Y.H. Moon) 대한기계학회 2002 대한기계학회 춘추학술대회 Vol.2002 No.10
Tube hydroforming provides a number of advantages over conventional stamping processes, including fewer secondary operations, weight reduction, assembly simplification, adaptability to forming of complex structural components and improved structural strength and stiffness. In this study, the effects of the process parameters such as the axial feeding amount and the internal pressure on the hydro-formability has been investigated. By using the mild steel tube the circular bulging test is performed at various experimental conditions to evaluate the hydro-formability.