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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 Design of an apparatus to determine coefficients of friction in deep drawing process at the flange and the radius regions(2013) Halkaci H.S.; Dilmec M.; Turkoz M.There are a lot of parameters which affects the accuracy of the Finite element analysis (FEA) of a sheet metal forming processes. One of the most important parameter is the friction coefficient between the dies and sheet. In order to ensure the effects of the other parameters to the process accurately, the real values of the friction coefficient should be entered to the FE software. Hence, the friction coefficient in the process should be determined by experiments which represent the real forming process. In drawing process the friction coefficient is generally determined for the flange and the radius regions and for draw beads by three different tests. In this study an apparatus was designed and manufactured that could be determined the friction coefficients in the flange and radius regions together in a single experiment. So it will be able to save from time and costs. Copyright © 2013 MS&T'13®.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.
