http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
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.
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.
진공 다이캐스팅 공법을 이용한 연료전지용 알루미늄 분리판의 제조 공정
진철규 ( Chul Kyu Jin ),강충길 ( Chung Gil Kang ) 한국주조공학회 2011 한국주조공학회지 Vol.31 No.2
This study aims to investigate the formability of bipolar plates for fuel cell fabricated by vacuum die casting of ALDC 6. Cavity shape of mold is thin walled plate (size: 200 mm × 200 mm × 0.8 mm) with a serpentine channel (active area: 50 mm × 50 mm). Before bipolar plate was made by HPDC, computational filling behavior and solidification was performed by MAGMA soft. The final mold design for location and direction of channel was determined by computational simulation. Also, according to injection speed conditions, simulation result was compared to actual die casting experimental result. When vacuum pressure, injection speed of low and high region is 350 mbar, 0.3 m/s and 2.5 m/s respectively, products had few casting defects. On the other hand, at the same as injection speed, without vacuum pressure, products had many casting defects between end of the channel and overflow.
레오로지 박판의 전자교반을 응용한 진공 저압주조 제조공정
장신규 ( Sin Kyu Jang ),배정운 ( Jung Woon Bae ),진철규 ( Chul Kyu Jin ),강충길 ( Chung Gil Kang ) 한국주조공학회 2012 한국주조공학회지 Vol.32 No.1
In this study, we develop the lower pressure die casting with rheo-forming process of A356 aluminum alloy and vacuum system which can control the crystal size and obtain the high strengthened-light material. Using this process, we fabricate the thin plate for bipolar plate through the low pressure die casting with electromagnetic stirring and vacuum-evacuation which can control the crystal grain by electromagnetic stirring. Thin plate (110 mm × 130 mm × 1 mm) is fabricated by this process. The average Vickers hardness of thin plate is about 77 HV.
압탕 최소화를 위한 터보차저하우징의 융합 S/W 응용 제조기술 및 실험적 검증
이학철 ( Hak-chul Lee ),서판기 ( Pan-ki Seo ),진철규 ( Chul-kyu Jin ),서형윤 ( Seo-hyung Yoon ),강충길 ( Chung-gil Kang ) 한국주조공학회 2017 한국주조공학회지 Vol.37 No.1
The purpose of this study is to increase the part recovery rate (to more than 70%) during the casting of a ductile cast iron turbo charger housing using a heater around the riser. Before creating a casting mold, various runner and riser systems were designed and analyzed with a casting simulation analysis tool. The design variables were the heater temperature, top insulation, riser location, riser diameter and the riser shape. During the feeding from the riser to the part, the reverse model was better than the forward model. When heating the riser (above 600 ℃), solidification of the riser was delayed and the feeding effect was suitable compared to that without heating. At a higher heating temperature, less solidification shrinkage and porosity were noted inside the part. On the basis of a casting simulation, eight molds were fabricated and casting experiments were conducted. According to the experimental conditions, external and internal defects were analyzed and mechanical properties were tested. The ultimate tensile strength and elongation outcome were correspondingly more than 540MPa and 5% after a heat treatment. In addition, a maximum part recovery rate of 86% was achieved in this study.
Slope plate 공법을 이용한 반응고 박판 및 제조 장치 개발
구자윤 ( Ja Yoon Koo ),배정운 ( Jung Woon Bae ),진철규 ( Chul Kyu Jin ),강충길 ( Chung Gil Kang ) 한국주조공학회 2012 한국주조공학회지 Vol.32 No.1
In this study, semi-solid thin plate of A 356 aluminum alloy was fabricated by using slope plate apparatus and vacuum pressurization. Slope plate was used to produce semi-solid material with spheroidal microstructures. After molten metal was poured into the slope plate connected to the pouring hole of die, semi-solid material flowed into the die cavity by vacuum degree. The primary crystals of the cast metal became spheroidal. In order to increase the working pressure, gas pressurization of U shape was designed for fabrication of thin plate. For 3 bar of gas pressure and 60 mmHg of vacuum degree, thin plate was fabricated without defects on surface.