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진공 다이캐스팅 공법의 사출조건에 따른 연료전지용 분리판 성형 해석 및 제조 공정
진철규 ( Chul Kyu Jin ),장창현 ( Chang Hyun Jang ),김재성 ( Jae Sung Kim ),최재원 ( Jae Won Choi ),강충길 ( Chung Gil Kang ) 한국주조공학회 2011 한국주조공학회지 Vol.31 No.5
The vacuum die casting is a promising candidate of the stamping process for fabrication of fuel cell bipolar plate due to its advantages, such as precision casting, mass production and short production time. This study proposes vacuum die casting process to fabricate bipolar plates in fuel cell. Bipolar plates were fabricated under various injection conditions such as molten metal temperature and injection velocity. Also, according to injection velocity conditions, simulation results of MAGMA soft were compared to the experimental results. In case of melt temperature 650℃, misrun occurred. When the melt temperature was 730℃, mechanical properties were low due to dendrite microstructure. Injection velocity has to set at more than 2.0 m/s to fabricate the sound sample. When melt temperature, injection velocity (Fast shot), and vacuum pressure are 700℃, 2.5 m/s and 30 kPa respectively, sample had good formability and few casting defects. Simulation results are mostly in agreement with experimental results.
금형 충전 해석을 이용한 연료전지 분리판 진공 다이캐스팅 금형 설계 방안 및 실험 검증
강충길 ( Chul Kyu Jin ),진철규 ( Chang Hyun Jang ),장창현 ( Chung Gil Kang ) 한국주조공학회 2012 한국주조공학회지 Vol.32 No.2
In this paper, we present the results of our studies on optimal die design towards development of a vacuum die casting process to fabricate fuel cell bipolar plate with micro-channel array. Cavity and overflow shape is designed by computational filling analysis of MAGMA soft. Optimal die design consists of seven overflows at the end of cavity and three overflows at each side wall of cavity. The molten metal that passed the gate and reached the side wall flowed into the side overflow, no turbulent flow occurred, and the filling behavior and velocity distribution were uniform. In addition, partially solidified molten metal passing through the channel was perfectly eliminated by overflow without back-flow. When vacuum pressure, injection speed of low and high region was 300mbar, 0.3 m/s and 2.5 m/s respectively with Silafont 36 die casting alloy, sound sample without casting defects was obtained. The experimental results are nearly consistent with simulation results.