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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.
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.
안동규(Dong-Gyu Ahn),송동한(Dong-Han Song),노경보(Gyung-Bo Noh),한길영(Gil-Young Han) 한국기계가공학회 2009 한국기계가공학회지 Vol.8 No.2
The objective of this paper is to design stamping die of inner reinforcement panel with DL 950 advanced high strength steel as stamping materials through numerical analyses and experiments. The stamping process was designed as bending dominant process consisting of 1 step of notching and 4 steps of bending processes. In order to obtain a proper design of the stamping die, various three-dimensional elasto-plastic finite element analyses were performed using a commercial code AUTOFORM V4.2. Design parameter of stamping die was chosen as the corner radius of the stamping die for each step. From the results of the FE analysis, feasible corner radii of the stamping die, which can minimize the deviation of corner angle of the stamped part from design data, and forming load for each part were estimated. Stamping experiments were carried out using the manufactured stamping die according to the proposed die design. The results of experiments were shown that the stamping die can successfully manufacture the inner reinforcement panel with DL 950 advanced high strength steel as base stamping material.
고정형 경계조건에서의 0.7 ㎜ SUS304H 판재의 충격에너지 흡수 특성
안동규(Dong-Gyu Ahn),문경제(Kyung-Je Moon),문형철(Hyung-Chul Moon),한길영(Gil-Young Han),정창균(Chang-Gyun Jung),양동열(Dong-Yol Yang) 한국기계가공학회 2007 한국기계가공학회 춘추계학술대회 논문집 Vol.2007 No.-
The objective of this paper is to investigate into characteristics of the impact energy absorption of SUS304H sheet with thickness of 0.7 ㎜ 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 experiments, the absorption rate of the impact energy and the deformation characteristics of the specimen have been quantitatively examined. From the results of the experiments, it has been shown that the diameter of the impact head does not affect the absorption energy of the SUS304H sheet. It is also found that the absorption rate of impact energy decreases with increasing of impact energy. In addition, it has been shown that the SUS304H sheet is fractured at the impact energy of 106.6 J when the diameter of the impact head is 10 ㎜.
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.
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.