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강성린(Sung Lin Kang),김기영(Ki Young Kim),곽호영(Ho-Young Kwak) 대한기계학회 2004 대한기계학회 춘추학술대회 Vol.2004 No.4
The growth of the critical size bubble by diffusion process in viscoelastic medium was treated by an integral method for the concentration boundary layer adjacent to the bubble wall. In this study, we obtained a set of the first order time dependent equations to obtain bubble radius and gas pressure inside the bubble simultaneously. The calculated final cell sizes depending on the initial saturation pressure are in close agreement with the observed ones. The governing equations developed in this study may be used in polymer processing of microcellular foams.
강성린(Sung Lin Kang),김기영(Ki Young Kim),곽호영(Ho-Young Kwak) 대한기계학회 2003 대한기계학회 춘추학술대회 Vol.2003 No.11
The molecular cluster model for the homogeneous bubble nucleation was extended to predict the bubble<br/> nucleation events in elastomers, polymers and polymer solutions. For the bubble nucleation in elastomers<br/> and polymers, the strain energy overcome by a critical bubble was also considered. The calculation results<br/> for the number of bubbles nucleated are in good agreement with observed ones.
첨가제가 포함된 PMMA 내에서 초임계 이산화탄소에 의한 초미세 폼의 생성
김기영(Ki Young Kim),강성린(Sung Lin Kang),곽호영(Ho-Young Kwak) 대한기계학회 2005 대한기계학회 춘추학술대회 Vol.2005 No.11
Decompression experiments from a PMMA compound saturated with CO₂ at high pressure were performed to investigate the heterogeneous effect of the additives on the microcellular foam structure generated. The observed results were compared with the calculation results by using the molecular cluster model. Uniform distribution of foams was obtained at lower temperature of 20℃ but heterogeneous effect due to the additives occurred at the solution temperature of 40℃, which is quite different from the results obtained in PMMA/CO₂ solution where homogeneous nucleation occurs at the temperature range between 40℃ and 70℃. Experimental results obtained in this study may be applied to the injection-molding process of PMMA compounds.
이현무,안소미,안성민,서정환,정병조,강성린 한국융합학회 2023 미래기술융합논문지 Vol.2 No.4
파워인덕터 생산용 표면 UV 인쇄장치 성능 연구는 원기둥 자석의 자력 형성이 상, 하로 형성되게 제작함으로써 제품 고정 시 제품이 뒤집히거나, 세워지는 현상을 방지하는 기술을 적용하여 인쇄 진행 시 품질 소모성 자재(제판, Squeegee)의 파손을 방지하고, 인쇄 품질을 향상시킬 수 있다. 자력의 방향을 바꾼 원기둥 자석의 개발로 파우더 압축으로 제작한 메탈 소재 제품에 대한 고정 방법이 안정화 되어 소형 제품에 대한 생산 능력이 증대할 것이다. 최종적으로 원기둥 자석을 활용한 파워인덕터 표면 UV 인쇄 장치를 연구함으로써, 기존 작업 진행하던 스프레이, Deeping 방식과 차별성을 둘 수 있고, 생산량이 크게 향상될 것이며 결과적으로는 인원 감축으로 원가절감 및 경쟁력 있는 제품 생산을 할 수 있을 것이다. Research on power inductor surface UV printing equipment using cylindrical magnets can prevent damage to quality consumable materials (making plates, Squeegees) during printing and improve printing quality by applying technology to prevent product from flipping or standing up when fixing the product by making the magnetic formation of cylindrical magnets form up and down. The development of cylindrical magnets that changed the direction of magnetic force will stabilize the fixing method for metal products made by powder compression, increasing the production capacity for small products. Finally, by studying the power inductor surface UV printing device using cylindrical magnets, it can be differentiated from the spray and deeping methods that were being worked on, production will be greatly improved, and as a result, cost reduction and competitive production will be possible.