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빠르고 안정된 소결 특성을 갖는 Core-Shell 구조로 이루어진 레이저 소결용 메탈 복합 분말의 개발
방영길(Young-Kil Bang),최기섭(Ki-Seop Choi),박창현(Chang Hyun Park),김형일(Hyung-Il Kim),임병석(Byung-Seok Lim),김동수(Dong-Soo Kim) 대한기계학회 2007 대한기계학회 춘추학술대회 Vol.2007 No.10
In this work, metal powder which has core-shell structure was developed for the laser sintering process. The metal core of powder was coated by the polymer resin that can be melted by laser. To improve powder fluidity and adhesion force of powders, various additives(antioxidant, anti-additive, nano-material etc.) was added to the powder. In addition, it has good physical/chemical stability in comparison with commericialized powder.
나노물질의 선택적 레이저소결을 이용한 유연전기소자 구현 연구현황
고승환(Seung Hwan Ko) 대한기계학회 2011 大韓機械學會論文集B Vol.35 No.5
대부분의 유연전기소자는 플라스틱, 옷감, 종이와 같이 고온에 민감한 물질이기 때문에 열에 민감한 기판 위에 금속을 증착하고 패터닝할 수 있는 저온 공정의 개발이 필요하다. 최근 기존의 광식각과 진공증착 방법을 이용하지 않고 액상으로 금속 나노입자의 박막을 형성하고 선택적 레이저 소결을 이용하여 플라스틱에 열적손상을 최소화하고 고해상도의 금속 패터닝을 방법이 많은 연구가 활발히 진행되고 있다. 본 논문에서는 본 연구실에서 활발히 수행중인 나노물질의 선택적 레이저소결법을 이용하여 유연 디스플레이와 유연태양전지와 같은 유연전기소자의 개발 동향에 대해 알아보고 앞으로의 발전방향에 대해 논의한다. A plastic-compatible low-temperature metal deposition and patterning process is essential for the fabrication of flexible electronics because they are usually built on a heat-sensitive flexible substrate, for example plastic, fabric, paper, or metal foil. There is considerable interest in solution-processible metal nanoparticle ink deposition and patterning by selective laser sintering. It provides flexible electronics fabrication without the use of conventional photolithography or vacuum deposition techniques. We summarize our recent progress on the selective laser sintering of metals and metal oxide nanoparticles on a polymer substrate to realize flexible electronics such as flexible displays and flexible solar cells. Future research directions are also discussed.
선택적 레이저 소결법을 이용한 기어박스의 정밀주조기술 개발
최상련,김천기,박근,오철호 韓國工作機械學會 2000 한국생산제조학회지 Vol.9 No.1
In this paper, rapid prototyping and precision castiong technology have been devloped for the manufacturing of inlet pear box of an airplane. Rapid prototyping is a new prototyping technology that produces complicated parts directly from threedimensional CAD data with a high efficiency, and has been extensively applied to various manufacturing processes. In the present work, Selective Laser Sintering(SLS) system is untilized in order to manufature prototype of the inlet gear box. Prototyping technology using SLS is also investigated from the viewpoint of accuracy. Using the SLS master, the casting products are manufactured through several processes such as: vacuum casting, lost wax shell casting and investment cast-ing. The shrinkage characteristics of wax and cast iron in the casting procedures are considered, and then reflected to the design procedure so that the accuracy of the product in improved consequently.
CO₂레이저를 이용한 산업용 임의형상제작 시스템의 온도 성능 및 소결실험
김동수(Dong-Soo Kim),안영진(Young-Jin An),백영종(Young Jong Baek) 대한기계학회 2005 대한기계학회 춘추학술대회 Vol.2005 No.5
Solid Freeform Fabrication (SFF) using CO₂ laser is one of the Rapid Pototyping It is used to fabricate in a short time any 3 dimensional shapes by layer-by-layer sintering of polymer, ceramic or metal powder. To develop this SFF system, it needs effective laser scanning path, temperature and z-axis control for lamination. This study has applied 3-axis Dynamic Focusing Scanner for scanning large area instead of the existing fθ lens using commercial Selective Laser Sintering (SLS). Also the structure analysis and the development of control algorithm for sintering process have performed. In this study, the temperature evaluation for sintering process has performed and the sintering test of polyamid is now in process.
SLS 공정을 이용한 산업용 SFF 시스템용 신소재 고분자분말 개발
방영길(Young-Kil Bang),최기섭(Ki-Seop Choi),박창현(Chang Hyun Park),김형일(Hyung-Il Kim),임병석(Byung-Seok Lim),김동수(Dong-Soo Kim) 대한기계학회 2007 대한기계학회 춘추학술대회 Vol.2007 No.5
Polymers for laser sintering were needed in order to fabricate the articles with the three-dimensional duplication equipment of SLS (selective laser sintering) process. The thermal properties, particle size, distribution, and shape of polymer powder had a close relation with the processibility of laser sintering. In this study, we prepared new polymer powders with uniform size and higher bulk density by wet process. Wet process consists of several finely-controlled steps such as dissolution, nucleation, propagation and crystallization. Several additives were added to improve the thermal, rheological, and flow properties.
SLS 공정에서 최적 공정 조건 도출을 위한 실험적 연구
배성우(Sungwoo Bae),김동수(Dong Soo Kim) 대한기계학회 2014 대한기계학회 춘추학술대회 Vol.2014 No.11
Selective Laser Sintering (SLS) system consists of various element technologies. Main components of the system include a position control system, a speed control system of the roller, and nitrogen atmosphere furtherance for the powdered sintering. Other systems which make the core of the SLS system are build room and the feed room for powder epitaxial, a temperature control system, and a scan path generator for the laser. The powder material for laser sintering is necessary to produce prototypes in 3D Printing (3DP) based on SLS process. This powder material is sintered in powder room using CO2 laser after spreading evenly using roller to reproduce mold via SFF. This study addresses an 3DP system by using the SLS process which applies single laser system to enable manufacturing of 3D shape. And to evaluate applicability of the single laser system, experiments were conducted with optimal fabricating process.
SLS 공정에서 최적 공정 조건 도출을 위한 실험적 연구
배성우(Sung-Woo Bae),유성연(Seong-Yeon Yoo),김동수(Dong-Soo Kim) 한국생산제조학회 2012 한국생산제조학회지 Vol.21 No.3
Selective Laser Sintering(SLS) system consists of various element technologies. Main components of the system include a position control system, a speed control system of the roller, and nitrogen atmosphere furtherance for the powdered sintering. Other systems which make the core of the SLS system are build room and the feed room for powder epitaxial, a temperature control system, and a scan path generator for the laser. The powder material for laser sintering is necessary to produce prototypes in Solid Freeform Fabrication(SFF) based on SLS process. This powder material is sintered in powder room using CO<SUB>2</SUB> laser after spreading evenly using roller to reproduce mold via SFF. This study addresses an SFF system by using the SLS process which applies single laser system to enable manufacturing of 3D shape. And to evaluate applicability of the single laser system, experiments were conducted with optimal fabricating process.
SLS 공정을 이용한 산업용 SFF 시스템의 개발 및 소결실험
조홍석(Hong-Seok Jo),조현택(Hyun-Taek Cho),백영종(Yung-Jong Baek),김동수(Dong-Soo Kim) 대한기계학회 2007 대한기계학회 춘추학술대회 Vol.2007 No.5
Selective Laser Sintering (SLS) is currently recognized as a leading process in the new field of solid freeform fabrication (SFF). It is used to fabricate in a short time any 3 dimensional shapes by layer-by-layer sintering of polymer, ceramic or metal powder. To develop this SFF system, it needs effective laser scanning path, temperature and z-axis control for lamination. Therefore, in this study, through the application of control algorithm for sintering process have performed, temperature evaluation for sintering process has performed and the manufacturing sample using SLS process.
SLS 공정에서의 Polyamide-6 파우더 소결과 그 영향에 관한 연구
배성우(Sung-Woo Bae),김동수(Dong-Soo Kim),김형일(Hyung-Il Kim),김충환(Chung-Hwan Kim),조정대(Jung-Dae Cho),최병오(Byung-Oh Choi) 한국기계가공학회 2006 한국기계가공학회 춘추계학술대회 논문집 Vol.2006 No.-
In the solid freeform fabrication (SFF) system using selective laser sintering (SLS), polyamide-12 powder is currently recognized as general material. In this study, some kinds of polyamide-6 powders with different shape and particlesize were fabricated to investigate the formability, the microstructure and mechanical properties. Also, to develop a more elaborate and rapid system, this study employs a new SLS device with a 3-axis dynamic focusing scanner system instead of the existing f θ lens used in commercial SLS. Polyamide-6 powders having the average size of 100 m were treated thermally in order to keep the spherical symmetry in shape. These polyamide-6 powders were mixed with polyamide-12 powders having the average size of 50 m to give the bimodal distribution of size. These mixed powders showed the better fabrication in the selective laser sintering processbecause the smaller particles of polyamide-11 played an important role in the compact packing of powders by filling the void space between the large particles of polyamide-6. Also, Experiments have performed to evaluate the effect of a scanning path and sintering parameters by fabricating the various 3D objects.