Proceedings of the Korean Society for Technology of Plasticity Conference (한국소성가공학회:학술대회논문집)
- 2009.05a
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- Pages.114-117
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- 2009
An Experimental Study on Void Closure Behavior with respect to Reductions in Height
압하율에 따른 기공압착 거동에 관한 실험적 연구
- Choi, I.J. ;
- Choi, H.J. (KIMS) ;
- Park, H.J. ;
- Choi, S. ;
- Jung, T.W. ;
- Park, D.K. ;
- Choi, S.K. ;
- Lim, S.J.
- 최익준 (인하대학교 대학원 금속공학과) ;
- 최호준 (한국생산기술연구원) ;
- 박훈재 (한국생산기술연구원) ;
- 최석우 (한국생산기술연구원) ;
- 정택우 (한국기계연구원부설 재료연구소) ;
- 박동규 ((주)케이에스피) ;
- 최성규 ((주)케이에스피) ;
- 임성주 (한국생산기술연구원)
- Published : 2009.05.07
Abstract
In this work, closing behavior of the voids generated in a casting process was investigated for various parameters such as reductions in height void size and billet rotation during hot open die forging process. The reduction in height and path schedule including the number of paths and billet rotation were chosen as key process variables to express the change of geometrical void shape and void closing behavior. On the other hand, values of die overlapping and die width ratio were set to be constant. Extend of void closure was observed and evaluated using tensile test and microscope. Based on the experimental result, it is ensured that void closure do not occur at 15% and 30% reduction in height as well as one or two rotations of a billet. The useful datum obtained from this study could be utilized to establish an optimum path schedule in the open die forging process.