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유한요소법을 이용한 해머단조 공정에서 타격 횟수의 결정
장성민(S. M. Jang),김성현(S. H. Kim),이민철(M. C. Lee),조범제(B. J. Cho),전만수(M. S. Joun) 한국소성가공학회 2009 한국소성가공학회 학술대회 논문집 Vol.2009 No.10
In this paper, three-dimensional finite element approach to determining the number of blows in hammer forging is presented. Energy efficiency which is a major factor affecting the number of blows in hammer forging is assumed to decrease linearly as die-material contact area increases. The approach is applied to predicting the number of blows in counterblow hammer forging of large crank shaft for medium sized ship engine.
대형크랭크샤프트 해머단조공정의 시뮬레이션 및 실험적 검증
장성민(S. M. Jang),김성현(S. H. Kim),이민철(M. C. Lee),제갈영진(Y. J. Jegal),박태현(T. H. Park),조범제(B. J. Cho),전만수(M. S. Joun) 한국소성가공학회 2010 한국소성가공학회 학술대회 논문집 Vol.2010 No.5
In this paper, non-isothermal analysis of hammer forging process for a large crankshaft is conducted. A simple and computationally efficient approach to non-isothermal three-dimensional hot forging simulation, theoretically based on a rigid-thermoviscoplastic finite element method, is employed. In the approach, it is assumed that the temperatures of dies are increased at the same ratio as the workpiece temperature decreases. Hot forging of a large crankshaft is simulated using AFDEX 3D and the simulated result is compared with the actually forged one in detail. It has been verified that the predictions are in good agreement with the experiments. The successful simulation and development of a large crankshaft by the hammer forging technology will contribute to opening a new area of hammer forging application and to enhancing competitiveness of national machinery industries especially including ship part industries.