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고세장비 연속주름을 갖는 박판구조물 제작을 위한 다단성형공정 개발
최성우(Sung-Woo Choi),박상후(Sang-Hu Park),정호승(Ho Seung Jeong),조종래(Jong-Rae Cho),민준기(June Kee Min),김현준(Hyun June Kim),폴 윌리암(Paul Willians) 대한기계학회 2009 대한기계학회 춘추학술대회 Vol.2009 No.11
Stamping process is widely used in the fabrication of various sheet-parts for vehicle, airplane, and electronic devices by the merit of low processing cost and high productivity. Among the sheet metal parts, in recent the use of thin sheets having corrugated structures is rapidly increased with relation to the energy devices; for instance, heat exchanger and fuel cell. However, it is very difficult to make the corrugated structures directly in the stamping process due to their geometrical complexity. To solve this problem, multistep stamping (MSS) process was proposed in this work; sequential lineup as the 1<SUP>st</SUP> stamping, heat treatment, and the 2<SUP>nd</SUP> stamping. By the MSS, we got successful results in the fabrication of very thin corrugated structures which can be applicable to a plate-type heat exchanger.
판형 열교환기에 적용 가능한 고세장비 연속주름 구조를 갖는 박판구조물 제작
최성우(Sung-Woo Choi),박상후(Sang-Hu Park),민준기(June Kee Min),정호승(Ho Seung Jeong),하만영(Man-Young Ha),조종래(Jong-Rae Cho) 대한기계학회 2010 대한기계학회 춘추학술대회 Vol.2010 No.5
Stamping process is widely used in the fabrication of various sheet-parts for vehicle, airplane, and electronic devices by the merit of low processing cost and high productivity. Among the sheet metal parts, in recent the use of thin sheets having corrugated structures is rapidly increased with relation to the energy devices; for instance, heat exchanger and fuel cell. However, it is very difficult to make the corrugated structures directly in the stamping process due to their geometrical complexity. To solve this problem, multistep stamping process was proposed in this work; sequential lineup as the 1<SUP>st</SUP> stamping, heat treatment, and the 2<SUP>nd</SUP> stamping. By multi-stamping, we got successful results in the fabrication of very thin corrugated structures which can be applicable to a plate-type heat exchanger.
고세장비 연속주름을 갖는 박판구조물 제작을 위한 다단성형공정 개발
최성우(Sung-Woo Choi),박상후(Sang Hu Park),정호승(Ho Seung Jeong),민준기(June Kee Min),정재헌(Jae-Hun Jeong),조종래(Jong-Rae Cho),김현준(Hyun June Kim),폴윌리암(Paul Willians) 대한기계학회 2010 大韓機械學會論文集A Vol.34 No.2
스탬핑 프로세서는 고생산성과 낮은 가격으로 인해 자동차 차제나 항공기 부품, 그리고 전자제품 등 다양한 장치에 널리 이용된다. 최근에 에너지 산업과 연관되어 연료전지 분리판, 열교환기 등에 사용되는 주름구조를 가지는 박판의 응용이 급속히 증가되고 있다. 그러나 복잡한 형상 때문에 주름구조물을 한번의 성형으로 만들기가 매우 어렵다. 따라서 본 연구에서는 다단성형공정을 이용하여 성형성을 향상시키는 방법을 제안하였다. 1 차 박판성형 후 열처리를 통하여 가공경화 부분을 제거하고 다시 성형하는 방법으로 복잡하고 실용성이 높은 박판구조물 제작이 가능하도록 하였다. 본 연구에서는 제안한 방법을 검증하기 위하여 판형 열교환기에 응용이 가능한 두께 100 ㎛를 가지는 박판주름구조를 제작하고 공정변수를 연구하였다. The stamping process is widely used in fabricating various sheet-parts for vehicle, airplane, and electronic devices due to its low processing cost and high productivity. Recently the use of thin sheets with corrugated structures has rapidly increased for the production of energy devices, e.g., heat exchangers and fuel cells. However, it is very difficult to make corrugated structures directly in the stamping process due to their geometrical complexity. To solve this problem, this paper proposes a multi-step stamping process with a combined heat treatment process: a sequence of the first stamping, heat treatment, and second stamping. By multi-stamping, we obtained successful results in fabricating very thin corrugated structures with thicknesses of 100 ㎛; these are applicable as part of a plate-type heat exchanger.
금속 적층제조를 통해 제작된 내부 구조물의 압축변형 및 파단에 관한 연구
진칭예(QINGYE JIN),정호승(Ho-seung Jeong),손용(Yong Son),연시모(Si-Mo Yeon),박상후(Sang-hu Park) 대한기계학회 2019 대한기계학회 춘추학술대회 Vol.2019 No.11
Developing of AM (Additive Manufacturing) process, lattice structures are fabricated with stable mechanical properties recently. Lattice structures have its potential performances after yield and during destruction. In this study, fracture characteristics of the lattice structures (BCC & FCC) fabricated by SLM process with optimized manufacturing condition were analyzed by FE-Analysis and Experiments. As a result, several fracture modes and preferential fracture area were found by FE-Analysis, comparing with result of compression experiment result. In addition, the lattice structures have great sacrificial prices rather than structural prices, because of its fracture characteristics that whose strength rises during destruction till final fracture. Lattice structures seem to have nice application value with disposable lightweight parts for impact, such as impact armor for defense or aerospace. Impact characteristics, which has high sacrificial price, of usual lattice structures will be studied as a future research.
항공기용 Air-to-Air 열교환기 고온고압 성능평가 설비구축 및 시험기법 연구
윤원근(Won Geun Yun),신성기(Sung Kee Shin),정호승(Ho Seung Jeong),김재민(JaeMin Kim),김귀순(Kuisoon Kim),하만영(Man Yeong Ha),손창민(Changmin Son) 한국추진공학회 2013 한국추진공학회 학술대회논문집 Vol.2013 No.12
발전 및 에너지 시스템 분야에서는 고효율, 친환경 시스템의 요구도 증가로 인해 열교환기에 대한 중요성이 증대되고 있는 실정이다. 이에 따라 실제 가스터빈 운전 조건을 구현하는 고온고압 성능평가 설비에 대한 중요성 또한 증가하여, 고온고압 환경에서 안정적으로 제어할 수 있는 설비와 시험기법에 대한 연구를 수행하였다. 시험설비는 관형 Air-to-Air 열교환기로 검증 시험을 수행하였고, 그 결과 CFD 결과값과 유사한 결과를 나타내었다. 본 연구의 고온고압 열성능시험설비는 향후 가스터빈 분야의 안정적인 시험평가 설비로 운용, 제공될 것이다. Growing demand for lower emissions and improved specific fuel consumption can be met by incorporating heat exchangers into the power and energy system. High pressure and high temperature(HPHT) heat exchanger test facility has been constructed in order to do thermal performance validation test of air-to-air heat exchanger at gas turbine working conditions. The commissioning test has been conducted using a compact tubular heat exchanger. The results show that test facility delivers stable operating and measured data is good agreement with predicted performance of the heat exchanger. This thermal performance test facility would serve as a test bed for the heat exchangers of the present and future gas turbine applications.
관형 열교환기의 기계적 건전성 확보를 위한 유체-고체 연성해석과 브레이징 접합부의 국부적 물성분포 분석
강석훈(Seok Hoon Kang),박상후(Sang Hu Park),민준기(June Kee Min),정호승(Ho Sung Jeong),손창민(Chang Min Son),하만영(Man-Young Ha),조종래(JongRae Cho),김현준(Hyun Jun Kim) 대한기계학회 2013 大韓機械學會論文集A Vol.37 No.1
최근 환경적 요인으로 친환경 에너지나 효율성이 높은 에너지관리 기술에 관한 많은 연구가 진행되고 있다. 그 중에서 열교환기는 역사가 오래된 기계장치 이지만 최근 온실가스 저감을 위해 항공기 등에 응용을 시도함에 따라 그 가치가 증가하고 있다. 또한 이러한 열교환기가 항공기 엔진에 적용될 경우 고온, 고압의 조건을 견디어야 함으로 기계적 건전성 평가는 매우 중요하다. 따라서 본 연구에서는 관형 열교환기의 취약부인 브레이징 접합부의 국부적인 물성분포 분석과 유체-고체 연성해석을 통하여 구조적 안전성을 평가하였다. U자형 단일 곡관을 제작하여 해석과 실험을 통하여 신뢰성을 검증하였고 브레이징 조건 변경을 통하여 재료 분포를 확인하였다. Recent years have witnessed a strong need for eco-friendly and energy-efficient systems owing to global environmental problems. A heat exchanger is a well-known mechanical rig that has long been used in many energy systems. The use of a heat exchanger in an airplane engine has been attempted. In this case, the heat exchanger should be redesigned to be compact, lightweight, and highly reliable, and the issue of mechanical integrity gains importance. Therefore, in this study, we proposed a method for evaluating the mechanical integrity of a tube-type heat exchanger. A U-shaped single tube was used as an example, and its behavior and stress distribution were studied using fluid-structure interaction (FSI) analysis.
조종래(Jong-Rae Cho),송상현(Sang-Hyun Song),전우진(Woo-Jin Jeon),박진성(Jin-Sung Park),정호승(Ho-Seung Jeong),김창수(Chang-Soo Kim),김현준(Hyun-Jun Kim) 한국마린엔지니어링학회 2010 한국마린엔지니어링학회 학술대회 논문집 Vol.2010 No.10
The objective of this study is to estimate the thermo-mechanical performance of cross corrugated plate with geometrical parameters in plate heat exchanger. Solid element needs a lot of elements and requires longer computational time, whereas shell element and sub model require less number of elements and computational time. For this reason, development of analysis technique is required. Based on the analysis technique, parametric analysis was performed applying parameters as plate thickness, pitch/height ratio and intersection angles. By the parametric analysis, we understand the characteristics for corrugated plate. in plate heat exchanger.
균일압력 유도에 의한 꺾임 구조를 가진 미세주름 박판구조물 성형을 위한 고무성형 공정연구
김민훈(Min Hoon Kim),박상후(Sang Hu Park),정호승(Ho Seung Jeong),조종래(Jong Rae Cho),하만영(Man Yeung Ha) 대한기계학회 2011 大韓機械學會論文集A Vol.35 No.8
주름구조를 가지는 박판구조물은 비행기, 자동차, 전자제품 등의 다양한 용도의 열교환기로 사용 된다. 이러한 주름구조를 가지는 박판구조물의 경우 대량생산을 위하여 박판소성가공 공정으로 제작하게 되는데 꺾임 각을 가지는 주름구조를 형성하는 것은 매우 어렵다. 이 문제를 해결하기 위해 본 연구 에서는 정확한 주름구조를 형성하기 위하여 일정한 압력을 박판의 전면에 효과적으로 미칠 수 있도록 새로운 고무성형공정을 제안한다. 본 연구에서 제안한 공정을 검증하기 위하여 우선 유한요소해석을 통해 고무성형공정 변수를 최적화하였다. 그리고 최적화한 고무성형공정을 이용하여 꺾임구조와 미세주름 구조를 가지는 박판을 제작함으로써 본 연구에서 제안한 공정이 목표로 하는 박판의 성형에 효과적인 공정임을 검증하였다. Thin sheets with a corrugated structure are generally used for the fabrication of heat exchangers for electronics, airplanes, and vehicles. However, it is difficult to fabricate corrugated structures, especially those with a bent angle, using the conventional stamping process because of its intrinsic formation mechanism. We propose a novel rubber-forming process for the effective pressing of the both tilted sides of a plate under the same pressure to form exact corrugated shapes. We use finite element analysis and experiments to study the rubber-forming process parameters, and we evaluate the maximum allowable bent angle for high-quality formation. We show that the proposed method is effective for the fabrication of bent plates with low cost.
레이저 기반 표면 열처리 및 클래딩을 이용한 SUS 316 판재 성형성 향상
조영관(Yeong-Kwan Jo),유재현(Jae-Hyun Yu),정호승(Ho-Seung Jeong),박상후(Sang-Hu Park) 한국기계가공학회 2020 한국기계가공학회지 Vol.19 No.2
We propose a practical method for increasing formability of a sheet metal plate using laser heat treatment (LHT) and cladding process. In this work, two kinds of process such as laser-induced heat treatment and cladding were utilized to evaluate the effect on formability of SUS316 sheets with different thickness of 1 and 3 mm. By using a vertically line-patterned tensile specimen that was LHTed or cladded on its surface, the process parameters of each surface treating method were studied and optimized. Through the basic test, we knew that the laser power of 900 W and scanning speed of 500 mm/min was the best condition for increase of formability. As the treatment results, ultimate tensile strength and elongation were increased as approximately 2.1 and 7.0%, respectively. To verify the usefulness of this work in industrial cases, we conducted a bulging test using with and without LHTed SUS316 sheet metal blanks. The results show that the bulging height of LHTed sheet was increased by 73% compared to that of the original one.