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- 저자 : 김주권(Joo-Kwon Kim) (검색결과 5 건)
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화학적 초미세 발포 사출성형을 이용한 에어컨 드레인 펜의 공정 최적화에 대한 연구
김주권,곽재섭,김준민,이준한,김종선,Kim, Joo-Kwon,Kwak, Jae-Seob,Kim, Jun-Min,Lee, Jun-Han,Kim, Jong-Sun 한국금형공학회 2017 한국금형공학회지 Vol.11 No.2
In this study, we applied microcellular foaming injection molding process to improve the performance of system air-conditioner drain fan which had been produced by injection molding process and studied the optimization of process conditions through 6-sigma process and response surface method (RSM) to reduce weight and deformation of products. Additive type, melt temperature, mold temperature, and injection screw shape were selected as the factor affecting the weight and deformation of the products by carrying out analysis of trivial many through ANOVA and design of experiment (DOE) method. Among the effect factor, we set the addictive type to Long G/F and screw shape to foaming screw which had the highest level of weight reduction and deformation reduction. The amount of foaming agent gas was set at 60 ml, which was the limit beyond which the weight of product did not decrease any more. For melt temperature and mold temperature, we studied the conditions where both weight and deformation were minimized using the RSM. As a result, we set the melt temperature to $250^{\circ}C$, fixed mold temperature to $20^{\circ}C$, and moving mold temperature to $40^{\circ}C$. The improvement effect was analyzed by appling the selected optimal conditions to the production process using the microcellular foaming injection molding. The results showed that the mean weight of product was measured to be 1,420g which was 19% lower than that measured in the current process. The standard deviations of the weights were found to be similar to those in the current process and it showed a low dispersion. The mean deformation was measured to be 0.9237mm, which represented a 57% reduction compared to the mean deformation in the current process, and the standard deviation decreased from 0.3298mm to 0.1398mm. Moreover, we analyzed the process capability for deformation, and the results showed that the short-term process capability increased from 2.73 to 6.60 which was even higher than targeted level of 6.0.
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휴대폰 후면 커버의 공정시간 단축에 따른 치수 편차의 최적화에 관한 연구
김주권(Joo-Kwon Kim),김종선(Jong-Sun Kim),이준한(Jun-Han Lee),곽재섭(Jae-Seob Kwak) 한국기계가공학회 2017 한국기계가공학회지 Vol.16 No.6
In this study, we investigated the optimization of process conditions by using the Six Sigma process, design of experiment (DOE) method and response surface method (RSM) to resolve dimensional deviation and appearance problems arising from the shortened process time of the mobile phone rear cover. The analysis of the trivial many was performed by 2-sample T-test and cooling time, and mold temperature and packing pressure were selected as the vital fews affecting the overall width of the product. The optimal conditions of the process were then studied using the DOE and the RSM. We analyzed the improvement effects by applying the selected optimal conditions to the production process and the results showed that the difference between the mean value and target value of the overall width stood at 0.01 mm, an improvement of 88.89% compared to current process that fell within the range of standard dimension. The short-term process capability stood at 4.77σ, which implied an excellent technology level despite a decrease by 0.22σ compared to the current process. The difference in process capability decreased by 2.44σ to 0.41σ, showing a significant improvement in management capability. Ultimately, the process time of the product was shortened from 18.3 seconds in the current process to 13.65 seconds, resulting in a 34.07% improvement in production yield.
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A Study on the Process Optimization of Microcellular Foamed Ceiling Air-Conditioner 4-Way Panel
Joo-Kwon Kim(김주권),Jung-Hee Lee(이정희),Jong-Sun Kim(김종선),Jun-Han Lee(이준한),Jae-Seob Kwak(곽재섭) 한국기계가공학회 2018 한국기계가공학회지 Vol.17 No.6
Deflected 4-way panels of ceiling air conditioners produced by injection molding process have caused dew condensation at the edge of products. In order to prevent this drawback with reducing weight and deformation, this study proposed renovated process adopting microcellular foaming. According to results from 2-sample t-test and analysis of variance(ANOVA), the critical factors affecting weight were melt temperature and injection speed. In addition, the vital effects on deformation were structure at the edge, mold temperature and cooling time. Optimal conditions of these parameters were derived by regressive analysis with CAE and response surface method(RSM), and then applied to an actual design and process stage to analyze performance. As a results, it clearly showed that new process improved process capability as well as reduced both weight and deformation by 18.8% and 71.9% respectively compared to the conventional method.
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6시그마를 이용한 자동차 범퍼의 치수 최적화에 대한 연구
김주권(Joo-Kwon Kim),김종선(Jong-Sun Kim),이준한(Jun-Han Lee),곽재섭(Jae-Seob Kwak) 한국기계가공학회 2017 한국기계가공학회지 Vol.16 No.6
In this study, the optimization of the overall dimensions of an automobile bumper was investigated through CAE and experiment using the Six Sigma method and design of experiment (DOE) method, respectively. Injection pressure, injection speed, injection time, cooling time, holding time, injection temperature, and holding pressure were selected as the vital parameters affecting the overall width of product through analysis of trivial many using CAE. The optimal values were determined using the DOE method, and we analyzed the improvement by applying the optimal conditions to the production process. As a result, the mean value of the overall width was close to the target value, with a deviation of 0.05mm, and the processability and I-MR control were remarkably improved. Finally, the dimension pass rate of the product improved by 20%.
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마이크로 머시닝에서 공구 정렬과 가공정밀도에 관한 연구
진동현(Dong-Hyun Jin),안주은(Ju-Eun An),김주권(Joo-Kwon Kim),이성호(Sung-Ho Lee),손출배(Chul-Bae Son),곽재섭(Jae-Seob Kwak) 대한기계학회 2015 대한기계학회 춘추학술대회 Vol.2015 No.11
Micro end mill is one of the precise tools, which is used in machining of ultra-precision products such as micro channel, micro patterned mold, and so forth. To satisfy the required precision of these products, many studies were investigated on the cutting force, burr formation, and burr generation mechanism of micro end mill, but there are little studies on the alignment of micro tool even which is the foundation of machining. Hence in this investigation, a simulation on manufacturing of channel with misaligned micro end mill was carried out and its effect was evaluated.
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