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고출력 CW Nd:YAG 레이저를 이용한 인코넬 718 판재 절단시 모서리부 절단 특성 분석
안동규,변경원,Ahn, Dong-Gyu,Byun, Kyung-Won 대한용접접합학회 2008 대한용접·접합학회지 Vol.26 No.5
The objective of this paper is to investigate the effects of the laser power, the material thickness, comer angles, and the loop size on the formation of the comer in the cutting of Inconel 718 super-alloy sheet using high-power CW Nd: YAG laser. In order to investigate the influence of comer angles and loop sizes on the melted area and the formation of comer in the sharp comer, angular cutting tests and loop cutting tests were carried out. The results of the angular cutting tests were shown that the melted area is minimized and the melting mode is changed from nose melting in the thickness direction to the secondary melting induced by the attached dross when the comer angle is $90^{\circ}$. Through the results of loop cutting tests, the variation of the melted area and the comer shape in the sharp comer according to the loop size were examined. In addition, it was shown that a proper loop size is approximately 3 mm. The results of above experiments will be reflected on the knowledge base to generate optimal cutting path of the laser.
고출력 CW Nd:YAG 레이저를 이용한 저탄소 냉연강판 절단시 모서리부 절단 특성 분석
안동규,유영태,Ahn, Dong-Gyu,Yoo, Young-Tae 대한용접접합학회 2006 대한용접·접합학회지 Vol.24 No.4
The objective of present research works is to investigate the effects of process parameters, including the power of laser, cutting speed, material thickness, and the edge angle, on the melted area in the sharp edge of the cut material fur the case of cutting of a low carbon steel sheet using high-power CW Nd:YAG laser. In order to investigate the influence of edge angle and size of loop on the melted area in the sharp edge, angular cutting tests and loop cutting tests have been carried out. From the results of angular cutting tests, the relationship between the edge angle and the melted area has been obtained. The results of the experiments have been shown that the melted area is rapidly reduced from $120^{\circ}$ of the edge angle and the melted area is nearly zero at $150^{\circ}$ of the edge angle. Through the results of loop cutting experiments, the relationship between the cutting angle on the melted area in the edge according to the size of loop have been obtained. In addition, it has been shown that a proper size of loop is nearly 3 mm as the corner angle is greater than $90^{\circ}$ and 5 mm as the comer angle is less than $90^{\circ}$. The results of above experiments will be reflected on the knowledge base to generate optimal cutting path of the laser.
고출력 CW Nd:YAG 레이저를 이용한 CSP 1N 냉연강판 절단시 공정변수가 모서리 절단특성에 미치는 영향
안동규(Dong-Gyu Ahn),김민수(Min-Su Kim),변경원(Kyung-Won Byun),박형준(Hyung-Jun Park),유영태(Young-Tae Yoo) 한국기계가공학회 2006 한국기계가공학회 춘추계학술대회 논문집 Vol.2006 No.-
The objective of present research works is to investigate the influence of process parameters including the power of laser, cutting speed, material thickness, and the corner angle on the melted area in the sharp corner of the cut material for the case of cutting of CSP 1N sheet using high-power CW Nd:YAG laser. The relationship between the edge angle and the melted area with respect to each cutting condition has been obtained to investigate the effects of the cutting angel on the melted area in the edge. The results of the experiments have been shown that the melted area is rapidly reduced from 120 o of the edge angle and the melted area is nearly zero at 150 o of the edge angle. The loop cutting experiments have been carried out to obtain the relationship between the cutting angle on the melted area in the edge with respect to the size of loop. From the results of the experiments, it has been shown that the melted area is greatly reduced when the size of loop is less than 5 ㎜.
Dong-Gyu Ahn(안동규),Humayun Hassan(하산 후마윤),Sun Ho Baek(백선호),Ho Kim(김호) 한국기계가공학회 2020 한국기계가공학회지 Vol.19 No.7
The geometry and the defect of the groove of the part provoke a sudden change of stress in a local region. The objective of this paper is to investigate the effects of the geometry and the imperfection of a small groove on stress distributions in the vicinity of the joined region for the ABS part with a thin wall using a three-dimensional finite element analysis (FEA). Several types of groove are designed to improve joining characteristics in the vicinity joined region. The imperfection model of the small-sized groove is obtained from observation of deposition characteristics of a fused deposition modeling process. Local stress distributions in the vicinity of the joined region are predicted by the FE model with refined meshes. The influence of the angle and the imperfection of the groove on appearance regions of the maximum stress and distributions of the defined principal stress for different loading conditions is examined using the results of FEAs. Finally, a proper design of the groove is proposed to improve joining characteristics between the substrate and the ABS part.
안동규(Dong-Gyu Ahn),김진석(Jin-Suck Kim),문경제(Gyoung-Jae Moon),한길영(Gil-Young Han),문현수(Hyun-Su. Moon),윤영석(Young-Seok Yoon) 한국생산제조학회 2006 한국공작기계학회 춘계학술대회논문집 Vol.2006 No.-
The objective of this research works is to develop back panel dies of PDP TV with a large size. In order to design the geometry of the dies and an initial size of blank optimally, the finite element analysis has been carried out using AUTOFORM V4.2. The conner radius of the upper trimming area and the distance from the outer line of the blank holder to the outer line of the blank have been selected as design parameters to remove the wrinkling of the trimming area. The results of the analyses have been shown that a feasible product without wrinkles and skid lines can be obtained when the conner radius ranges from 6㎜ to 8㎜ and the distance is greater than 20㎜. From the proposed design of the dies and an initial blank size, the final die set of the back panel has been successfully manufactured.
유한요소해석을 이용한 SPFC 780 판재의 충격 특성 연구
안동규(Dong-Gyu Ahn),남경흠(Gyeong-Heum Nam),한길영(Gil-Young Han),성대용(Dae-Yong Seong),양동열(Dong-Yol Yang),임지호(Jiho Lim) 대한기계학회 2009 대한기계학회 춘추학술대회 Vol.2009 No.11
The objective of this paper is to investigate the influence of impact conditions on the impact characteristics of the SPFC 780 sheet for the case of the free boundary conditions. In order to examine impact characteristics of the sheet, three-dimensional finite element analyses have been performed. High speed tensile tests have been carried out to obtain strain-stress relationships including the effects of the strain rate. Through the comparison of the results of FE analyses and that of impact tests, an accurate FE model has been developed. In order to reduce error range of load and displacement, the hyper-elastic model and the damping factor have been employed. From the results of FE analyses, the variation of stress and strain energy in the SPFC 780 sheet has been quantitatively examined.
안동규(Dong-Gyu Ahn),문경제(Kyung-Je Moon),정창균(Chang-Gyun Jung),한길영(Gil-Young Han),양동열(Dong-Yol Yang) 대한기계학회 2007 대한기계학회 춘추학술대회 Vol.2007 No.5
The objective of this paper is to investigate the influence of impact conditions on the impact characteristics of the stainless sheet for the case of the fixed boundary conditions. In order to examine impact characteristics of the sheet, three-dimensional finite element analyses and impact tests have been performed. High speed tensile tests have been carried out to obtain strain-stress relationships including the effects of the strain rate. In order to improve an accuracy of the FE analysis, the hyper-elastic model and the damping factor have been introduced. The results of the FE analyses and the impact tests have been shown that the diameter of the impact head does not affect the absorption energy of the stainless sheet. In addition, it has been shown that the absorption rate of energy maintains almost 82.5 - 83.5 % irrespective of the impact energy level and the diameter of the impact head. From the results of FE analyses, the variation of stress and strain energy in the stainless sheet has been quantitatively examined.
개발 도상국들을 위한 적층 제조 공정의 적정 기술 분야 적용성 고찰
안동규(Dong-Gyu Ahn) 적정기술학회 2021 적정기술학회지(Journal of Appropriate Technology) Vol.7 No.2
최근에 4차 산업 혁명을 견인하기 할 수 있는 다품종 소량을 위한 주요 제조 기술로써 적층 제조 공정이 부각 되고 있다. 적층 제조 공정의 층별 적층 특성은 상대적으로 저비용으로 3차원 형상과 기능성을 가진 실제 제품을 쾌속 제작할 수 있다. 이 논문의 목적은 개발 도상국들을 위한 적층 제조 공정의 적정 기술 분야 적용성에 대한 고찰이다. 적층 제조 공정의 적정 기술 적용 예들에 대한 조사/분석을 수행하여, 적층 제조 공정의 적정 기술 분야 실제 활용 가능성에 대하여 고찰하였다. 또한, 적층 제조 공정의 적정 기술 분야에 대한 주요 적용 예들을 소개하였다. 최종적으로 개발 도상국에서 적층 제조 기술을 이용한 실제적 제품 생산에 관련된 적정 기술 측면의 향후 발전 방향에 대하여 토론하였다. In recent years, additive manufacturing (AM) processes have emerged as an important manufacturing technology for a multi-item small sized production to lead the 4th industrial revolution. The layer-by-layer deposition characteristics of AM process can rapidly produce physical parts with three-dimensional geometry and desired functionality in a relatively low cost environment. The goal of this paper is to investigate the applicability of AM process to appropriate technologies for developing countries. Through the review of examples of appropriate technology of the AM process, the possibility of a practical usage of the AM process for the appropriate technologies is examined. In addition, significant applications of the AM process to the appropriate technology are introduced. Finally, future issues related to production of physical parts for developing countries using the AM process are discussed from the viewpoint of the appropriate technology.
자동차 범퍼 단면으로 정형 가공된 ISB판재의 충격 에너지 흡수 특성 분석
안동규(Dong-Gyu Ahn),남경흠(Gyeong-Heum Nam),한길영(Gil-Young Han),성대용(Dae-Yong Seong),양동열(Dong-Yol Yang) 한국기계가공학회 2008 한국기계가공학회 춘추계학술대회 논문집 Vol.2008 No.-
The objective of this paper is to investigate into characteristics of the impact energy absorption of ISB panel with a bumper sections of automotive for the case of the fixed boundary conditions. In order to examine into characteristics of the impact energy absorption, drop impact tests have been performed. Through the results of the impact tests, The absorbed impact energy per weight, the nose penetration and the deformation characteristics of the ISB panel have been quantitatively examined. The experimental results of the ISB panel have been compared to those of SPFC 780 panel. From the results of the experiments, it has been shown that ISB panel with a bumper section of automobile has an excellent crashworthiness in comparison with SPFC 780 at the impact energy of 26.1 J and 65.9 J.