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김봉수(B. S. Kim),노동일(D. I. Roh),김경률(K. R. Kim),전만수(M. S. Joun) 한국소성가공학회 2013 한국소성가공학회 학술대회 논문집 Vol.2013 No.5
In this paper, a three-stage pancake-shape hot forging process is simulated with emphasis on prediction of under-filling defects due to air pocketing phenomena in the cavities enclosed by material, dies or tools and plane of symmetry. The basic approach is introduced to deal with air pocketing phenomena. The volumetric strain of each cavity is traced when the air pocket has no air hole and its pressure that is a function of the volumetric strain and maximum normal stresses of the neighboring contact interfaces is exerted onto the surface of material inside the air pocket. The presented approach is applied to a three-stage plate forging process in which the air pocketing phenomena can be sensitive to the plastic deformation of material. Predictions are compared with experiments, showing that they are in excellent agreement with each other.
가이드 롤의 모델링 및 이를 이용한 링롤링 공정의 해석
진호태(H. T. Jin),김경률(K. R. Kim),김응주(E. J. Kim),최무호(M. H. Choi),전만수(M. S. Joun) 한국소성가공학회 2015 한국소성가공학회 학술대회 논문집 Vol.2015 No.5
In this paper, a ring rolling simulation technique based on full three-dimensional model discretized by tetrahedral elements with emphasis on a new guide roll model is presented. The new guide roll model is devised to reflect spring-like behaviors in real situations. The technique is assisted by a powerful mesh system specialized optimally for ring rolling simulation and parallel processing technique to reduce computational time and applied to an artificial profile ring rolling process modified from a real ring rolling process.