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Numerical and Experimental Investigation on the Tube Forming in the Radial-Forward Extrusion
Beong-Du Ko,Dong-Hwan Jang,Ho-Joon Choi,Beong-Bok Hwang 한국정밀공학회 2005 International Journal of Precision Engineering and Vol.6 No.2
In this paper, the tube forming by radial-forward extrusion is analyzed by numerical simulation and experiments. The paper discusses the effect of process variables such as gap height, relative gap width and die comer radius on tube forming. The influence of deformation patterns of flange in radial extrusion on forward extrusion for tube forming is investigated and summarized in terms of the maximum forming force and hardness variations along the extrusion path. Furthermore the external defects are shown experimentally during the forming operation Based on finite element analysis in conjunction with experimental test in Al alloy, analysis is performed for important parameter combination in order to reduce forming defects. Eventually, the process parameters for safe forming are suggested in order to reduce the forming defects.
Numerical and Experimental Investigation on the Tube Forming in the Radial-Forward Extrusion
Ko Beong-Du,Jang Dong-Hwan,Choi Ho-Joon,Hwang Beong-Bok Korean Society for Precision Engineering 2005 International Journal of Precision Engineering and Vol.6 No.2
In this paper, the tube forming by radial-forward extrusion is analyzed by numerical simulation and experiments. The paper discusses the effect of process variables such as gap height, relative gap width and die comer radius on tube forming. The influence of deformation patterns of flange in radial extrusion on forward extrusion for tube forming is investigated and summarized in terms of the maximum forming force and hardness variations along the extrusion path. Furthermore the external defects are shown experimentally during the forming operation. Based on finite element analysis in conjunction with experimental test in Al alloy, analysis is performed for important parameter combination in order to reduce forming defects. Eventually, the process parameters for safe forming are suggested in order to reduce the forming defects.
고병두(Ko Beong Du),신명철(Sin Myong Cheol) 한국생산제조학회 2008 한국생산제조학회지 Vol.17 No.5
In the wire cut electrical discharge machining, the optimal machining parameters setting satisfying the requirements of both high efficiency and good quality is very difficult because its process involves a series of complex physical phenomena and the machining parameters are numerous over diverse range. In this paper, the experimental investigation has been performed to find out the influence of the machining parameters on the machining performance such as cutting speed and surface roughness. The selected experimental parameters are no load voltage, discharge peak current and pulse-off time. The experimental results give the guideline for selecting suitable machining parameters.