• Proceedings of the Korean Society for Technology of Plasticity Conference
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• 2008.10a
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• pp.222-225
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• 2008

Due to new requirements of the automotive industry, concerning lightweight and non-corroding construction, new production methods, The Hot Air Forming process of aluminum alloys are of special interest. The disadvantage of aluminum alloy is the poorer formability compared to steel. The Hot Air Forming process is one of the forming process receiving recent attention. In the current study, Fabrication of aluminum rear subframe has been attempted using seam and seamless aluminum tubes. On the base of hot workability of the extruded tube and PAM-STAMP simulation results, Optimum condition for fabricating aluminum rear sub(lame parts by Hot Air Forming could be determined.

• Transactions of the Korean Society of Mechanical Engineers A
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• v.24 no.1 s.173
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• pp.79-86
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• 2000

In this study, a method of optimal blank design using the sensitivity analysis has been proposed. To get sensitivity a well-known commercial code PAM-STAMP has been used. In order to verify this method, formings of square cup, clover shaped cup and L shaped cup have been chosen as the examples. With the predicted optimal blank both computer simulation and experiment are performed. Excellent agreements are recognized between the numerical results and the target contour shapes. Through the investigation, the proposed systematic method of optimal blank design is found to be effective in the design of the deep drawing process.

• Journal of the Korean Society of Manufacturing Process Engineers
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• v.3 no.2
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• pp.60-66
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• 2004

Finite element method is very effective method to simulate the forming processes with good prediction of the deformation behaviour. In this paper, It was focussed on the drawability factors on the square cup deep drawing by PAM-STAMP with using magnesium alloy to reduce car weight as well as to draw much attention from the viewpoint of environmental preservation high rigidity, In order to predict the effect of drawability factors, the relationships between punch load and punch stroke, the relationships between thickness strain and distance, and are used. According to this study, the results of simulation will give engineers good information to access the drawability of square cup deep drawing at warm temperature.

• Proceedings of the Korean Society for Technology of Plasticity Conference
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• 1996.06a
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• pp.75-86
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• 1996

Three-Dimensional finite element analysis is performed using PAM-STAMP for design evaluation of automotive back door inner panel die. Gravity process by blanks own weight, binder-wrap process, and drawing process in the forming operations are sequentially simulated with Virtual Manufacturing Method. The most valuable result in this research is that 3-D FEM analysis can be applied to the design evaluation of draw die in the die try-out, though effects of mesh size and drawbead resistance force on the numerical accuracy are much sensitive. For the intensive application to draw-die design and try-out, the experimental know-hows about the forming variables such as friction coefficient, punch velocity, drawbead force, etc are necessary.

• Proceedings of the Korean Society for Technology of Plasticity Conference
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• 2003.05a
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• pp.402-408
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• 2003

Currently tube hydroforming has many studies and applications in manufacturing industry, especially in automotive industry. But tube hydroforming was applied to the automotive component with simple shape. So the manufacturer and the researcher proposed additional processes to form the automotive component with complex shape. It is prebending and preforming. Prebending is to crush bend or rotary draw bend a tubular blank into a shape that facilitates placement into the next forming tool. Preforming is where the prebent tube is crushed into a shape that facilitates placement into the final forming tool. This paper analyzed and compared to the tube hydroforming process to using of general and preformed bending tube, also explained the importance of tube bending and preforming process. The explicit finite element program PAM-STAMP$\^$TM/ was used to simulate the tube hydroforming operations.

• Transactions of Materials Processing
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• v.9 no.3
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• pp.257-264
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• 2000

In this study, optimization for press forming condition of low arm was performed with explicit dynamic FEM code, Pam-Stamp. FEM simulation was coupled with the Taguchi's experiment technique having three design variables - friction coefficient, plastic anisotropy parameter, and blank shape - which are chosen to be optimized. The simulation results were compared with those of experiment. We found out the change of blank shape among these three design variables is very effective in optimizing press forming condition of low arm. In addition, the modified blank shape shows high yield of slitting coil.

• Journal of the Korean Society for Precision Engineering
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• v.16 no.12
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• pp.24-30
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• 1999

In the automobile development, press tool design and manufacturing are very difficult and need high cost experienced workers. Therefore, we concerned ourselves in the cost down and easy manufacturing. In this research, we have developed a tool for LH/RH of the front fender, which had difficulty in forming. We have carried out the drawing analysis by Pam-stamp and CATIA modeling. Finally, we get the optimal design parameter. As a result of try out, we found out the optimal width and margin at the center line for tool design. Also, in order to get good results we have to intaglio margin in the part of the wheel house and utilize double bead on every side except corner.

• Journal of the Korean Society for Precision Engineering
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• v.19 no.5
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• pp.29-35
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• 2002

This study shows the process design and forming analysis of permalloy shielding can that support the automobile multi-display parts to indicate the accurate information of car. This study is particularly important, since the accuracy of permalloy shielding can is known to affect the magnetic properties such as coercivity and permeability quite sensitively. The objective functions are defects such as hemming wind, hemming length, hemming wrap and tightness in prehemming process. The pre-hemming angle is considered as design parameter. The commercial finite element program PAM-STAMP™ was used to simulate the pre-hemming and hemming process. The ANN (Artificial Neural Network) has been implemented for minimizing of objective function and for investigating effect of punch angle relevant to the pre-hemming process. The results of analysis to validate the proposed design method are presented.

• Proceedings of the Korean Society for Technology of Plasticity Conference
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• 2001.05a
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• pp.77-80
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• 2001

IC lead frame needs the precision shape for good efficiency. In the blanking process, there are many parameter effected the dimensional accuracy : lead width, blanking order, striper force, tool clearance etc. In this research, the4 undesirable defects appeared in the final blanking process. so we measured the deflection of lead according to the stripper force using $PAM-STAMP_{TM}$. In the result, the deflection was decreased by increasing the stripper force properly. and we changed the blanking order on the test model. In the blanking order, deflection is good from the outer line position blanking to center line position. so we can design the precision die without tryout by the prediction of the lead deflection.

• Proceedings of the Korean Society for Technology of Plasticity Conference
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• 2000.10a
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• pp.153-157
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• 2000

This paper presents possible defects when welded blank hydroforming and focus on wrinkling, and the die design to prevent this defect An explicit finite element code, PAM-STAMP, is used to simulate welded blank hydroforming process. The numerical results are compared to the experimental results in the aspect of deformed shape. An automobile subframe is taken as an example to carry out finite element analysis.