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반경단조 공법을 이용한 사각봉재 제조공정의 최적 금형설계
장성민(S. M. Jang),김홍태(H. T. Kim),장시진(S. J. Jang),전만수(M. S. Joun),문호근(H. K. Moon) 한국소성가공학회 2012 한국소성가공학회 학술대회 논문집 Vol.2012 No.5
In conventional open die forging press, the material is formed by up and down motion of punch and thus the longitudinal elongation per stroke is relatively small, resulting in long manufacturing time. In addition, the center of material is exposed to decisive defects generated during cogging due to Mannesmann’s effect, that is, repeated deformation in compression after tension. To the contrary, four punches or dies in radial forging press the material in four perpendicular directions at the same time, which results in better quality as well as short manufacturing time. In the paper, the manufacturing process of a square bar using radial forging press is simulated to optimize die design and a set of optimized dies are given