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용탕단조한 AC4A Al / Al2O3+SiCp 하이브리드 금속복합재료의 미세조직과 기계적 성질
김민수,조경목,박익민 ( Min Soo Kim,Kyung Mox Cho,Ik Min Park ) 한국주조공학회 1994 한국주조공학회지 Vol.14 No.3
N/A AC4A Al/Al₂O₃+SiC_P hybrid composites were fabricated by the squeeze infiltration technique. Effect of applied pressure, volume fraction of reinforcement(AL₂O₃and SiC) and SiC particle size(4.5㎛, 6.5㎛ and 9.3㎛) on the solidification microstructure of the hybrid composites were examined. Mechanical properties were estimated preliminarly by fractographic observation, hardness measurement and wear test. Results show that the microstructure of the hybrid composites were quite satisfactory, namely revealing relatively uniform distribution of reinforcements and refined matrix. Some aggregation of SiC particle caused by particle pushing was observed especially in the hybrid composites containg in fine particle(4.5㎛). Refined matrix was attributed to applied pressure and increased nucleation sites with addition of reinforcements. Fractured facet also revealed finer for the hybrid composites possibly due to refined matrix. Hardness and wear resistance increased with volume fraction of reinforcements. For hybrid composites with 9.3㎛ SiC, hardness was somewhat lower and wear resistance higher than other composites.
정예수,김인배,박익민 ( Yae Soo Chung,In Bae Kim,Ik Min Park ) 한국주조공학회 1989 한국주조공학회지 Vol.9 No.3
N/A The effect of sulfur content and inoculant on solidification microstructure and mechanical properties of gray cast iron have been investigated. The main results obtained are as follows, 1. In the FeSi3Ca1Ba inoculated irons, with the variation of sulfur content, low sulfur levels(∼0.03%) yield low chill depth, high tensile strength, good wear resistance and type A graphite with a pearlite matrix. High sulfur levels(> 0.08%) provide high chill depth, low mechanical properties and type D graphite with small amount ferrite. 2. In case of inoculant variation with normal FeSi, FeSi3Ca1Ba, 30CaSi and uninoculation at 0.03 %S level, lower chill depth and higher tensile strength was obtained in the order ; 30CaSi, FeSi3Ca1Ba normal FeSi, uninoculation.
탄소섬유 강화 Cu 기지 금속 복합재료의 Squeeze Cast 조직 및 내마멸특성
김남수,지동철,조경목,박익민 ( Nam Soo Kim,Dong Chul Chi,Kyung Mok Cho,Ik Min Park ) 한국주조공학회 1992 한국주조공학회지 Vol.12 No.3
N/A A carbon fiber(CF) reinforced Cu-10%Sn alloy matrix composite was successfully fabricated by squeeze casting method employing preheated graphite mold and proper process controlling factors. The matrix solidification microstructure of the Cu-10% Sn /CF composite reveals α-dendrite and α+δ eutectoid. To compare the squeeze cast Cu-10%Sn /CF compostie with PM route fabricated Cu-graphite composites for electric contact material, mechanical wear and electrical arc wear tests were performed. Mechanical wear rate of the Cu-10%Sn /CF is much lower than that of the Cu-graphite composite. Weight loss with a variation of contact number in electrical arc wear tests shows a similar trend between the squeeze cast Cu-10%Sn /CF and PM Cu-graphite composites.
Al고압주조공법에서 사출슬리브 온도 조절을 통한 Chill layer의 최적 제어
박진영,김억수,박용호,박익민,Park, Jin-Young,Kim, Eok-Soo,Park, Yong-Ho,Park, Ik-Min 한국재료학회 2006 한국재료학회지 Vol.16 No.11
In this study, the effect of chill layers occurred in shot sleeve on the molten metal filling was analyzed through computer simulation. The behavior of chill layers with temperature variation of shot sleeve set from 200 to $280^{\circ}C$ was also investigated. The simulation results showed the chill layers set in the in-gates during the injection process change the main filling direction and cause turbulent flow pattern, resulting in porosities inside the castings. The amount of chill layers with the increasing temperature of shot sleeve was considerably reduced. Particularly, at the setting temperature of $280^{\circ}C$ by heat control unit, the biggest reduction in chill layers, excellent trimmed surface and the highest density were achieved, suggesting that as the optimal sleeve condition in aluminum high pressure diecasting, especially for highly complex parts like valve body.
국부가압 다이캐스팅 공정에서 3차원 유동 및 응고해석을 통한 자동차 변속기 Gear Housing의 주조방안 설계 최적화
박진영,김억수,박용호,박익민,Park, Jin-Young,Kim, Eok-Soo,Park, Yong-Ho,Park, Ik-Min 한국재료학회 2006 한국재료학회지 Vol.16 No.11
In the partial squeeze casting process, the filling behavior of liquid metal and solidification pattern in thick area have significant influence on the quality of casting products and die life. For the optimal casting design of automobile transmission gear housing, various analyses were performed in this study by using computer simulation code, MAGMAsoft and the simulation results were compared and analyzed with experimental results. By air pressure criteria, internal porosities caused by air entrap during the mold filling were predicted and reduced remarkably by modification of gating system. Also, optimal squeeze-time lag to apply partial squeeze pin in thick area was calculated and the castings was free from shrinkage defects with the result of solidification analysis. Consequently, casting design for automobile transmission gear housing was optimized and approved by Computer Tomography.
탕류 및 응고 해석을 통한 자동차 Gear Housing의 다이캐스팅 주조공정 설계
박진영 ( Jin Young Park ),김억수 ( Eok Soo Kim ),박익민 ( Ik Min Park ) 한국주조공학회 2004 한국주조공학회지 Vol.24 No.6
N/A In the die casting process, the flow of liquid metal has significant influence on the quality of casting products and die life. For the optimal process design of automobile gear housing, various analyses were performed in this study by using computer simulation code, MAGMAsoft. The simulation has been focused on the molten metal behaviors during the mold filling and solidification stages for the sound casting products. Also the internal defects were predicted by application of air pressure and feeding criteria.
ADC12 박육 다이캐스팅 주물 내의 기포결함에 미치는 플런저 속도와 고속전환위치의 영향
강호정 ( Ho Jeong Kang ),박진영 ( Jin Young Park ),김억수 ( Eok Soo Kim ),윤필환 ( Pil Hwan Yun ),박익민 ( Ik Min Park ) 대한금속재료학회(구 대한금속학회) 2016 대한금속·재료학회지 Vol.54 No.2
A die casting process has been widely used in the manufacturing of automotive parts which require near-net shape casting and high productive rates. However, high-pressure die castings usually contain regions of gas porosity due mainly to the entrapment of air or gas in the die during the high-speed injection of molten metal into the die cavity. Gas porosity in castings has hampered the wider use of this method in the creation of high-durability automotive components. However, to establish a shot condition in the shot sleeve during the die casting process is critical, and difficulty remains when attempting to optimize the shot condition to avoid air entrapment effectively. In this study, ADC12 plate die castings were fabricated under various shot conditions, in which different plunger velocities and fast shot set points. In addition, according to the shot conditions, die casting experimental results were compared with an experiment involving a water model and with the results of a numerical analysis. The porosity of the castings was analyzed using CT and using density and microstructural analyses, and the effect of the porosity on the mechanical properties was analyzed using hardness and tensile testing. When the plunger velocity was 1.0 m/s and the fast shot set point is cavity 0, 25% position, the results with the castings were optimal, with good mechanical properties and few areas of porosity. In addition, the simulation results were mostly in agreement with die-casting experimental results.(Received March 18, 2015)
Al 박육 다이캐스팅 주물에서 기포결함에 미치는 주물두께, 사출속도의 영향
강호정 ( Ho Jeong Kang ),박진영 ( Jin Young Park ),김억수 ( Eok Soo Kim ),조경목 ( Kyung Mox Cho ),박익민 ( Ik Min Park ) 한국주조공학회 2015 한국주조공학회지 Vol.35 No.4
The Al die casting process has been widely used in the manufacturing of automotive parts when the process requires near-net shape casting and a high productive rate. However, porosity arises in the casting process, and this hampers the wider use of this method for the creation of high-durability automotive components. The porosity can be controlled by the shot condition, but, it is critical to set the shot condition in the sleeve, and it remains difficult to optimize the shot condition to avoid air entrapment efficiently. In this study, the 4.5 mm, 2.0 mm plate die castings were fabricated under various shot conditions, such as plunger velocities of 0.7 m/s ~ 3.0 m/s and fast shot set points of the cavity of -25%, 0%, 25%, and 50%. The mold filling behavior of Al melts in the cavity was analyzed by a numerical method. Also, according to the shot conditions, the results of numerical analyses were compared to those of die-casting experiments. The porosity levels of the plate castings were analyzed by X-ray CT images and by density and microstructural analyses. The effects of the porosity on the mechanical properties were analyzed by tensile tests and hardness tests. The simulation results are in good general agreements with the die-casting experimental results. When plunger velocity and fast shot set point are 1.0 m/s and cavity 25% position, castings had optimum condition for good mechanical properties and a low level of porosity.