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보론 강판의 핫 프레스 포밍 공정 시 재료 물성 모델러와 DEFORM<sup>TM</sup>-HT를 활용한 상 변태 예측
강경필,이경훈,김영석,지민욱,서영성,Kang, K.P.,Lee, K.H.,Kim, Y.S.,Ji, M.W.,Suh, Y.S. 한국소성가공학회 2008 소성가공 : 한국소성가공학회지 Vol.17 No.4
Combined phase transformation and heat transfer was considered on the simulation of hot press forming process, using material properties modeler, $JMatPro^{(R)}$ and a finite element package, $DEFORM^{TM}$-HT. In order to obtain high temperature mechanical properties and flow curves for different phases, a material properties modeler, $JMatPro^{(R)}$ was used, avoiding expensive and extensive high temperature materials tests. The results successfully show that the strength of hot press forming parts may exhibit different strength in the same parts, depending on the contact of blank with tooling. It was also shown effectively that the strength of the parts can be controlled by designing appropriate cooling paths and coolants. This was shown in terms of different heat convection coefficient in the calculation. Overall, current combination of software was shown to be an effective tool for the tool and process design of hot forming process, although the material modeler needs to be additionally verified by an appropriate set of high temperature materials test.
자유단조 공정 시 내부 기공 거동 예측을 위한 멀티스케일 유한요소해석 연구
이경훈(K. Lee),강경필(K. P. Kang),곽은정(E. J. Kwak),나영상(Y. S. Na) 한국소성가공학회 2012 한국소성가공학회 학술대회 논문집 Vol.2012 No.5
In order to predict the internal void closing behavior in open die forging process, multiple scale modeling has been developed and applied. The huge size difference between ingot and inner void makes it almost impossible to model actual loading conditions and void shape together. The multiple scale modeling process is designed to solve macro and micro model separately and efficiently. The void closing behavior is simulated at 39 different locations in large ingot with upset and cogging process. The correlation between closing behavior and macro variables such as effective plastic strain or Von Mises strain, are studied to find efficient measure to predict soundness of forging product.