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Öğe An application of fuzzy logic control algorithm in hydro mechanical deep drawing process(Trans Tech Publications Ltd, 2014) Ozturk E.; Turkoz M.; Halkaci S.; Halkaci M.Hydro mechanical deep drawing (HDD) process is an advanced sheet metal forming technology. The aim of this process is to form deep drawn cups without any kind of forming instability such as buckling, wrinkling or bursting (tearing). The most important parameters in achieving this goal are fluid pressure and blank holder force. So in this study, a fuzzy logic control algorithm was used with Ls-Dyna FEA subroutines to determine the optimum fluid pressure (P) and the blank holder force (BHF) since it requires a lot of time and cost to perform this work with trial and error experiments. Minimum element thickness, punch wall contact position and wrinkling height were used as input parameters in the control algorithm. But studies on determining the BHF with the wrinkling height parameters have not been carried out yet. This will be investigated in further studies. © (2014) Trans Tech Publications, Switzerland.Öğe Determination of proper loading profiles for hydro-mechanical deep drawing process using FEA(Trans Tech Publications Ltd, 2014) Akay S.B.; Şükür E.F.; Turkoz M.; Halkaci S.; Koç M.Hydro-mechanical Deep Drawing (HMD) is an advanced manufacturing process developed to form sheet metal blanks into complex shapes with smooth surfaces using hydraulic pressure as an additional source of deformation force. There are many factors affecting the successful production of desired parts using this manufacturing process. The most important factors are the fluid pressure and blank holder force. Having proper values of these parameters during forming has a direct impact on part properties such as drawing ratio and thinning. In order to determine desired the fluid pressure and blank holder force profiles, which are different for every geometry, material and other process conditions, finite element simulations are conducted to save time and cost. Abaqus FEA software is used in this study. In order to define the continuously changing fluid pressure application area on the sheet material, which is not an available module or standard interface of software, sub-programs (sub-routines) are developed to properly and dynamically define the fluid pressure area. Proper, if not optimal, fluid pressure and blank holder force profiles, which allow the formability (LDR) of sheet material to be maximum, were obtained using trial and error method. Maximum thinning values on metal blank were used as a control parameter to determine if selected loading profiles result in the highest LDR with lowest thinning. © (2014) Trans Tech Publications, Switzerland.Öğe 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).
