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이형욱(H.W. Lee),박성준(S.J. Park),김정배(J.B. Kim),이혜진(H.J. Lee),송정한(J.H. Song),최석우(S. Choi) 한국생산제조학회 2011 한국생산제조시스템학회 학술발표대회 논문집 Vol.2011 No.4
Micro cross rolling forming on the shaft of the fluid dynamic bearing occurs the depth gradient along the groove face. The depth in the outlet part is greater than that in the inlet part. This is better than the contrary case in view point of fluid flow from fluid analysis results. In the contrary case, the eddy flow appeared in the inlet channel part as compared with the other case.
마이크로 헤링본 패턴 점진성형공정의 해석 및 실험적 연구
송정한(J. H. Song),이혜진(H. J. Lee),박진호(J. Park),이율(Y. Lee),최석우(S. Choi),이형욱(H. W. LEe) 한국소성가공학회 2012 한국소성가공학회 학술대회 논문집 Vol.2012 No.5
In this paper, the forming process for the herringbone pattern is conducted through a finite element simulation and experimental verification. The investigated parameters from the analysis are the variation of groove depth, forming load, and amount of the elastic recovery in elasto-plastic micro forming. Analysis result demonstrates that the groove was uniformly shaped with depth of 3㎛ considering the elastic recovery except the tip area. The simulation result is coinciding with experimental one. This result reveals that the incremental forming can be utilized to make the herringbone pattern on the bearing shaft.
최익준(I. J. Choi),최호준(H. J. Choi),박훈재(H. J. Park),최석우(S. Choi),정택우(T. W. Jung),박동규(D. K. Park),최성규(S. K. Choi),임성주(S. J. Lim) 한국소성가공학회 2009 한국소성가공학회 학술대회 논문집 Vol.2009 No.5
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.