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여흥태(Hongtae Yeo),공준영(Jungyoung Gong),허관도(Kwando Hur) 한국자동차공학회 2002 한국자동차공학회 춘 추계 학술대회 논문집 Vol.2002 No.5_3
The objective of the study is to improve the quality of wheel bearing hub by the rigid-plastic finite element analysis and the response surface methodology. The rigid-plastic finite element codes, AFDEX-2D and DEFORM-3D, were used to analyze the two-dimensional and three-dimensional forging processes, respectively. The response surface analysis is used to find the minimum underfill by the variation of design variables such as the height of billet after upsetting and punch angles of blocker dies. The metal flow of forged product show good agreement with the results from 20 and 3D analysis.
김기성(Kisung Kim),이효영(Hyoung Lee),천세영(Seyoung Chun),허관도(Kwando Hur) 대한기계학회 2008 대한기계학회 춘추학술대회 Vol.2008 No.5
In general, yoke which is a part of unmanned helicopter was usually produced by machining. Forging process has been considered to improve proof stress against repeated loading of the product. In this case, it is needed to investigate the geometry and formability of the yoke for functional structure. Therefore a process design for yoke forming has been studied by using rapid prototyping. Rapid prototyping, 3D modelling which was obtained by a reverse engineering technique, and die design and forming analysis have been performed according to the conditions such as preform, flash control, underfill, and the distribution of damage in forging.