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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 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.
BEM 해석을 통한 PBT 계열 제품 제작용 사출 성형 금형 설계
안동규(Dong-Gyu Ahn),김대원(Dae-Won Kim),백호현(Ho-Hyun Baik) 한국기계가공학회 2008 한국기계가공학회 춘추계학술대회 논문집 Vol.2008 No.-
The objective of this paper is to design the injection mould for PBT series part using BEM analysis. The influence of the mould temperature and the design of the runner system, including the runner, the gate and the sprue, on the clamping force was investigated to obtain a proper design of the mould and an appropriate condition of the injection molding. The results of the analysis showed that the clamping force of the product decreases with increasing the runner diameter. In addition, it was found that the clamping force is minimized at the 120℃ of the mould temperature. From the results of the analysis, it was shown that the clamping force of the product was minimized as the runner design was directly connected from the sprue to the gate and the diameter of the runner and the sprue was nearly 35 mm and 40 mm, respectively.
3차원 BEM 해석을 통한 박벽 구조 제품용 사출 성형 금형 설계
안동규 ( Dong Gyu Ahn ),김대원 ( Dae Won Kim ),박상오 ( Sang Oh Park ) 조선대학교 공학기술연구원 2008 공학기술논문지 Vol.1 No.1
The objective of this research work is to optimally design the injection mould for thin walled parts and to investigate the influence of process parameters on the quality of the molded part using the BEM analysis. The type of the runner and gate is selected as a design parameter of the mould. The injection time, the injection pressure, the temperature of the injection material, and the cooling time are selected as process parameters to obtain an optimum injection condition. From the result of the analysis for each design condition of the mould, it has been shown that an insufficient filling does not occur when the mixed type of runner system with a hot runner and a cold runner is introduced. In addition, the nozzle type of1he hot runner and the optimum design of the cold runner have been found. The effects of process parameters on the shrinkage rate of the molding part has been performed using the result of analysis for each combination of process parameters. Finally, an optimum injection condition has been obtained using the Taguchi`s method.
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.