Investigation into the effect of pre-bulging during hydromechanical deep drawing with uniform pressure onto the blank

• Published in: International journal of machine tools & manufacture Vol. 44; no. 6; pp. 649 - 657
• Main Authors: Lang, Lihui, Danckert, Joachim, Nielsen, Karl Brian
• Format: Journal Article
• Language: English
• Published: Elsevier Ltd 01.05.2004
• Subjects: Aluminum alloy; Hydromechanical deep drawing with uniform pressure onto the blank; Numerical simulation; Pre-bulging; Sheet hydroforming; Numerical simulation; Sheet hydroforming; Pre-bulging; Hydromechanical deep drawing with uniform pressure onto the blank; Aluminum alloy
• ISSN: 0890-6955; 1879-2170
• DOI: 10.1016/j.ijmachtools.2003.11.004

Many parameters influence the process of sheet hydroforming, but the key one is the pre-bulging. Pre-bulging includes two parameters: pre-bulging height and pre-bulging pressure, which influence the forming process significantly. In this paper, based on the proposed hydromechanical deep drawing with uniform pressure onto the blank, the effect of pre-bulging on the forming is investigated experimentally and the needed process windows for the pre-bulging pressure and the pre-bulging height are built by using pure aluminum and aluminum alloy. Finally, FEM is used to analyze the forming process to explain some results which were found in the experiment.