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차용훈(Yong Hun Cha),성백섭(Back Sub Sung),김재열(Jae Yeol Kim) 한국생산제조학회 2011 한국생산제조학회지 Vol.20 No.1
In this paper, the computer simulation analyzed the effective plastic strain and temperature behaviors. The quantitative analyses which proposed the effective mold design of S/CAM shaft was executed. The parameters of forging shape that affected on the optimize conditions that was calculated with simple equation were investigated. it is expected that the developed analysis model and design technique would greatly contribute to the drum brake optimal design considering effective plastic strain and temperature affected behaviors. This development could save more than 20% of production cost and reduced failure rate to more than 30%. By improving the life span of mold from 15,000 to 25,000, financial difficulty of company imposed on a mold manufacture could be overcome.
차용훈(Cha Yong-Hun),이재희(Lee Jae-Hee),최지현(Choi Ji-Hyun),성백섭(Sung Back-Sub) 한국생산제조학회 2010 한국생산제조시스템학회 학술발표대회 논문집 Vol.2010 No.10
This study evaluates strength of surface treatment parts using the hard anodizing method to the Aluminum Alloy Brake Disk. In order to achieve weight reduction of vehicles, Eco-friendly cars parts of the high-quality and competitive price is to equip. Especially while pursuing parts of weight reduction, it has to maintain the strength of the surface of the brake by nature. To enhance surface strength of Aluminum alloy. we use hard anodizing technology in the surface treatment. This study is resulted of 3 times greater the hardness value of the hard anodized specimen than the Aluminum alloy specimen for the lightweight parts of EV brake disk.
하아드 아노다이징 EV 브레이크 디스크 표면 성능 시험
차용훈(Yong-Hun Cha),성백섭(Back-Sub Sung),박창선(Cang-Sun Park),이재희(Jae-Hee Lee),최지현(Ji-Hyun Choi),박용순(Yong-Sun Park) 한국자동차공학회 2011 한국자동차공학회 지부 학술대회 논문집 Vol.2011 No.9
In this research, the friction characteristic of coating materials of anodizing were investigated. The test was conducted in air and un-lubricated state using the Ball-on-disc friction experiment tester. The hard anodizing coating specimen was suggested to be more advantageous coating than no treatment test specimen of aluminum. it is concluded that the hard anodizing brake disk has the most improved frictional performance and corrosion characteristics environment.
차용훈(Yong-Hun Cha),박창선(Cang-Sun Park),성백섭(Back-Sub Sung),이재희(Jae-Hee Lee),최지현(Ji-Hyun Choi),박용순(Yong-Sun Park) 한국생산제조학회 2011 한국생산제조시스템학회 학술발표대회 논문집 Vol.2011 No.4
In this research, the friction characteristic of coating materials of anodizing were investigated. The test was conducted in air and un-lubricated state using the Ball-on-disc friction experiment tester. The hard anodizing coating specimen was suggested to be more advantageous coating than no treatment test specimen of aluminum. it is concluded that the hard anodizing brake disk has the most improved frictional performance and corrosion characteristics environment.
차용훈(Cha Yong-Hun),이재희(Lee Jae-Hee),최지현(Choi Ji-Hyun),성백섭(Sung Back-Sub) 한국생산제조학회 2010 한국공작기계학회 추계학술대회논문집 Vol.2010 No.-
This study evaluates strength of surface treatment parts using the hard anodizing method to the Aluminum Alloy Brake Disk. In order to achieve weight reduction of vehicles, Eco-friendly cars parts of the high-quality and competitive price is to equip. Especially while pursuing parts of weight reduction, it has to maintain the strength of the surface of the brake by nature. To enhance surface strength of Aluminum alloy. we use hard anodizing technology in the surface treatment. This study is resulted of 3 times greater the hardness value of the hard anodized specimen than the Aluminum alloy specimen for the lightweight parts of EV brake disk.
장훈(Jang Hun),성백섭(Back-Sub Sung),차용훈(Yong-Hoon Cha),김덕중(Duck-joong Kim),이연신(Youn-sin Lee) 한국생산제조학회 2005 한국생산제조시스템학회 학술발표대회 논문집 Vol.2005 No.5
In the super slow speed die casting process, the casting defects due to melt flow should be controlled in order to obtain sound casting products. The casting defects that are caused by molten metal were cold shut formation, entrapment of air, gas, and inclusion. But the control of casting defects has been based on the experience of the foundry engineers. The calculation of simulation can produce very useful and important results. The calculation data of die casting process condition from the computer simulation by the Z-CAST is made to insure that the liquid metal is injected at the right velocity range and that the filling time is small enough to prevent premature solidification. The parameters of runner shape that affected on the optimized conditions that was calculated with simple equation were investigated. These die casting process control techniques of automobile valve body mid-plate have achieved good agreement with the experimental data of tensile strength, hardness test, and material structure photographies satisfactory results.
부산광역시 도심부 수리지질 특성과 지하지질 발달상태의 관련성
류상훈 ( Sang Hun Ryu ),함세영 ( Se Yeong Hamm ),차용훈 ( Yong Hoon Cha ),장성 ( Seong Jang ),정재형 ( Jae Hyeong Jeong ),손문 ( Moon Son ),김기석 ( Ki Seok Kim ) 대한지질공학회 2007 지질공학 Vol.17 No.3
본 연구에서는 부산광역시 도심지역인 부산진구 양정동에서 동구 수정동까지의 주로 경부고속철도 터널 통과 예정지역 지반조사로부터 얻어진 시추공 자료, 지하수위 자료, 공내 유향·유속 자료 그리고 현장수리시험 분석 자료를 바탕으로 천부지층과 수리지질 특성의 관련성을 평가하였다. 지하수위(Y)와 지형고도(X)의 관계식은 Y = 0.75X - 7.00 이며, 상관계수는 0.78로서 비교적 높은 편이다. 매립층, 충적층, 풍화대의 두께와 지하수위의 상관성을 살펴본 결과, 풍화대의 두께(A)의 자연로그값과 지하수위(Y)의 상관성이 상대적으로 높게 나타났으며, 그 회귀식은 Y = exp(9.974A) - 14.155과 같다. 지하수 유향·유속 결과, 지하수 유향은 대체적으로 남쪽~남서쪽으로 향하고 있으며, 이는 지역적인 지하수위 분포와 대체로 일치한다. This study intended to evaluate hydrogeological characteristics in relation to subsurface geology data obtained from borehole, groundwater level, borehole flowmeter test, and field hydraulic tests. The regression equation of groundwater level (Y) versus ground elevation (X) is expressed by Y = 0.75X - 7.00 with quite high correlation coefficient of 0.78. Relationship between groundwater level and thickness of landfill, alluvium, and weathered zone results in higher correlation of groundwater level (Y) versus natural log value of weathered zone (A) than other correlations, with the regression equation Y = exp(9.974A) - 14.155. The result of groundwater flow measurement in the boreholes indicates that groundwater flows towards between south and southwest, and this approximately agree with regional distribution of groundwater levels.
방전플라즈마 소결법으로 제작된 순 마그네슘 분말 소결체의 특성평가
홍지민,손현택,장세훈,이재설,차용훈,오익현,Hong, Ji-Min,Son, Hyeon-Taek,Chang, Se-Hun,Lee, Jae-Seoul,Cha, Yong-Hun,Oh, Ik-Hyun 한국재료학회 2007 한국재료학회지 Vol.17 No.6
The pure Mg powder compacts were successfully fabricated using SPS process. The machined chip powder showed flake shaped morphology with coarse surfaces, while gas atomized powders were spherical in morphology with smooth surfaces. In this study, SPS process was used to consolidate the pure Mg powder because this process allows high density consolidation in a short time. The results showed that increased sintering temperature from $350^{\circ}C$ to $500^{\circ}C$ with pressure of 30MPa, the maximum values of the density was increased from 98.1% to 99.8% of theoretical density, respectively. However, density of the sintered chip powders was higher than that of gas-atomized powder due to larger contact areas between particles.
박창선(Chan Sun Park),차용훈(Yong Hun Cha),성백섭(Back Sub Sung),변진용(Jin Yong Byun),박세리(Se Ri Park),김아름(A Rem Kim),김학윤(Yoon Hak Kim),이경석,Yong Sun Park 대한기계학회 2010 대한기계학회 춘추학술대회 Vol.2010 No.5
자동차 부품 소재로 사용하고 있는 S45C는 상용차 브레이크 시스템의 S/CAM 샤프트 제품에 적용 생산하고 있다. 그러나 S/CAM 생산과정에서 여러 공정으로 인한 생산단가의 상승으로 경쟁력이 떨어지고 있어 이전의 생산 방식인 금형의 문제점을 파악하고, 개선하고자 컴퓨터 시뮬레이션을 실시하였으며, 개발된 금형을 이용한 열간단조 부품생산의 과정을 컴퓨터 시뮬레이션을 통하여, 제품의 정확한 성형상태를 예측하고, 단조품의 온도 분포도와 응력 분포도를 분석하였다. In this paper, the computer simulation analyzed the effective plastic strain and temperature behaviors. The quantitative analyses which proposed the effective mold design of S/CAM shaft was executed. The parameters of forging shape that affected on the optimize conditions that was calculated with simple equation were investigated. it is expected that the developed analysis model and design technique would greatly contribute to the drum brake optimal design considering effective plastic strain and temperature affected behaviors. This development could save more than 20% of production cost and reduced failure rate to more than 30%. By improving the life span of mold from 15.000 to 25.000. financial difficulty of company imposed on a mold manufacture could be overcome.
방전플라즈마 소결공법을 이용한 Mg<sub>97</sub>Y<sub>2</sub>Zn<sub>1</sub> 합금 소결체의 특성평가
홍지민,손현택,장세훈,이재설,차용훈,오익현,Hong, Ji-Min,Son, Hyeon-Taek,Chang, Se-Hun,Lee, Jae-Seoul,Cha, Yong-Hun,Oh, Ik-Hyun 한국재료학회 2007 한국재료학회지 Vol.17 No.6
[ $Mg_{97}Zn_1Y_2$ ] alloy powders were prepared from gas atomization process, followed by consolidation using spark plasma sintering (SPS) process. The atomized $Mg_{97}Zn_1Y_2$ alloy particles were entirely spherical in shape and dendritic microstructure. The compacts sintered by SPS process had theoretical density more than 99%. The compressive yield strength was decreased as sintering temperature increased. It was found that the compressive strength showed the maximum value of 303MPa at the $Mg_{97}Y_2Zn_1$ specimen sintered under load of 255 MPa at $350^{\circ}C$.