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스퀴즈 병용 다이캐스팅법에 의한 Al-21%Si 합금의 결함제어에 관한 연구
김억수,김용현,이광학,김흥식 ( Ok Soo Kim,Yong Hyun Kim,Kwang Hak Lee,Heung Sik Kim ) 한국주조공학회 1995 한국주조공학회지 Vol.15 No.4
N/A Partial squeeze die casting is a special die casting process which combines squeeze technique to conventional die casting. The influence of squeeze pressure (1500-3000㎏/㎠) and time-lags(0.5-2.0sec) on defect control, density and microstructure of ADC12 alloy die casts has been studied by appling partial squeeze die casting to air compressure front housing production. Defect free, maximum density of 2.736㎏/㎤ with sound microstructure of ADC12 alloy die cast has been obtained by partial squeeze die casting technique at the pressure of 2000-2500㎏/㎠ and time-lags of 1.0-2.0sec.
김용현,김대영,이광학 ( Yong Hyun Kim,Dae Young Kim,Kwang Hak Lee ) 한국주조공학회 1996 한국주조공학회지 Vol.16 No.3
N/A In thia study, wear resistance of P-V cast iron which is used as a material of cylinder liner for marine engine was investigated. Wear test was conducted by the wear test machine of Suzuki type(EFM-III-E model, 5000N for load, 4.0㎧ for velocity, Japan). Adhesive and scuffing wear phenomena was studied when load was changed from 60N to 400N and wear velocity was 0.25㎧ at room temperature and 250℃. In the case of dry friction at room temperature, scuffing phenomena of wear test specimens without vanadium was occurred at 400N, specimens with vanadium at the 400N was observed only adhesive wear phenomena. In the case of dry friction at 250℃, scuffing phenomena was observed at 180N for wear specimens without vanadium and 240N for wear specimens with vanadium.
전자기력을 이용한 A1 scrap 으로 부터 과공정 A1 - Si 합금의 제조
윤지현(Ji Hyun Yoon),문광호(Kwang Ho Moon),김용현(Yong Hyun Kim),이광학(Kwang Hak Lee) 한국주조공학회 2001 한국주조공학회지 Vol.21 No.6
N/A The objective of this study is to investigate on manufacturing Al-scrap into hypereutectic Al-Si alloy by using electromagnetic force. The Fe element in the aluminium scrap was controlled by intermetallic compound method and using EMF(electromagnetic force). The most lumped compound was found after 10min holding at 690℃. A number of segregated compound was revealed when imposed to EMF at 30A. The refinement of primary Si particles was achieved by EMF stirring. Primary Si particles were refined and spheroidized most of all with the magnetic intensity of 180G for 10 min.
고압주조법에 따른 ADC12 합금의 미세조직과 기계적 성질
김억수,김용현,이광학,김흥식,김영홍 ( Ok Soo Kim,Yong Hyun Kim,Kwang Hak Lee,Heung Sik Kim,Young Hong Kim ) 한국주조공학회 1996 한국주조공학회지 Vol.16 No.1
N/A Front housings(a part for automobile) were die cast using ADC12 alloy by various die casting techniques such as ordinary die casting(OD), squeeze casting(SQ) and partial squeeze-pore free die casting(POD). Casting defects of those front housings and their mechanical properties were examined and compared. Casting defects such as blowholes and pinholes normally formed in OD method were eliminated by applying SQ or POD techniques. Tensile strength and elongation of die casting produced by SQ or POD techniques were 1.4 and 2.6 times higher than that of ordinary die castings. Tensile strength and elongation of ADC12 alloy front housings produced by SQ or POD techniques were increased by T6 treatment up to 38㎏/㎟ and 2.7 % respectively.
스퀴즈병용 다이캐스팅법에 의해 제조한 ADC12 합금의 기계적성질 및 미세조직에 관한 연구
김용현,김흥식,이광학 울산대학교 1998 공학연구논문집 Vol.29 No.2
ADC12 합금의 금형주조시 스퀴즈병용 다이캐스팅법을 적용하여 응고중 부분적으로 소성변형 시킨 결과 변화되는 기계적 성질과 미세조직을 연구하였다. 일반 금형주조시 발생하는 주조품의 내부 결함으로 기공과 핀홀등이 스퀴즈병용 다이캐스팅법을 적용하므로서 모두 제거할 수 있었다. 수지상 초정과 알루미늄-규소 망상조직은 소성 변형되어 미세한 결정입자로서 소지금속에 균질하게 분포되었으며, 그결과로서 인장강도와 신율이 일반 금형 주조품보다 2.6배 증가하였다. A research has been conducted on the mechanical properties and microstructure of ADC12 alloy casted by partial squeeze die casting method. Internal defects normally developed in ordinary die casted ADC12 alloy such as blow holes and pipe holes were suppressed by partial squeeze die casting. primary aluminium dendrite and aluminium-silicone network structures were plastically deformed and distributed in matrix uniformly as a fine crystalline particles. As a result of plastic deformation of ADC12 alloy during sodification process, tensile properties of the alloy increased 2.6 times higher than that of typically die casted ADC12 alloy.
진공다이캐스트법에 의한 Al 합금과 Fe-17wt%Cr 강의 주조접합 특성연구
김흥식,김용현,이광학,김억수 한국주조공학회 1999 한국주조공학회지 Vol.19 No.5
To overcome the undesirable deformation, peeling off and geometrical restrictions which were mainly caused by differences in thermal expansion coefficients during the cladding of aluminum strip and stainless strip, new processing method based on vacuum die casting is designed and implemented in fabricating Fe-17wt%Cr steel (stainless steel). To increase cast-bonding ability, the surface of Fe- 17wt%Cr steel is electrochemical etched to have optimum pit size (above 0.2 mm) and pit density (above 30%). The implementation of vacuum die casting by using surface treated stainless steel (Fe-17wt%Cr Steel) produces good trial products having acceptable cast-bonding ability. The enabling conditions for cast-bonding are pouring temperature 690˚C, filling speed 30 m/sec and casting pressure 800 ㎏/㎠. The microscopic observation of cast-bonded Al/Fe-17wt%Cr steel does not show any evidence of intermetallic compounds. The bonding strength of trial products is 150-400 ㎏/㎠ and this is stronger than conventionally cladded metal having 30-70 ㎏/㎠. (Received September 3, 1999)