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Increasing the limiting drawing ratio of AA 5754 aluminum sheet by hydromechanical deep drawing process
(2011) Halkaci M.; Türköz M.; Dilmeç M.; Halkaci S.; Da?han B.
Formability of sheet metals can be increased by Hydromechanical Deep Drawing (HDD) process. Formability of the deep drawn cups is generally assessed by Limiting Drawing Ratio (LDR) which is the ratio of the blank diameter to punch diameter. In order to increase LDR by HDD, process parameters of the HDD should be arranged properly. Generally to obtain a successfully formed part in HDD, the main parameters which are fluid pressure and blank holder force, must be changed according to punch stroke. Arranging the fluid pressure and blank holder force vs. punch stroke curve conveniently by the method of trials and errors is a hard duty. So these parameters should be arranged by using FEA. In order to obtain the maximum LDR, the appropriate fluid pressure and blank holder force curves were investigated in this study. Finally LDR of the hydromechanical deep drawn AA 5754 cup was determined both numerically and experimentally. © 2011 IBF (RWTH Aachen) & IUL (TU Dortmund).