• Proceedings of the Korea Contents Association Conference
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• 2019.05a
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• pp.371-372
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• 2019

금속 3D 프린팅의 응용분야는 자동차, 우주항공, 의료/헬스, 전자기기, 금형 등으로 분류할 수 있다. 최근 들어 선진국을 중심으로 아크 용접기반 금속 3D 프린팅 기술의 연구개발이 활발히 진행되고 있다. 3D 프린팅 기술은 CAD 설계 정보를 이용한 적층 제조방식이기 때문에 내부 형상이 아무리 복잡하여도 제작이 가능하고, 디자인이 변경되더라도 별도의 금형 제작 없이 제작이 가능하다는 장점이 있다. 와이어 아크기반 금속 3D 프린팅 기술은 차세대 생산제조 핵심기술로 발전할 전망이다. 금속 3D 프린터의 기술경쟁력 제고를 위해서 적층패턴, 와이어정밀 송급 및 적층품질 실시간 모니터링 등의 시스템 제어 기술과 대형 금속부품의 고생산성을 위한 적층가공 시스템 기술개발이 진행될 것으로 예상된다. 금속 와이어 아크를 이용한 대형 3D 프린팅 시스템의 지식재산권 확보 전략을 수립하기 위해 대형 3D 프린터 기술, 금속 와이어 3D 프린터 기술, 아크 3D 프린터 기술의 세 가지 분야에 대한 특허동향 분석을 수행하였다.

• Journal of Digital Convergence
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• v.18 no.11
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• pp.187-194
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• 2020

This study present to Framework & R&D direction of the 3d printing Integrated Control & Monitoring System. To ensure this purpose, we developed integrated 3d printing control system Framework for DED & PBF and we introduce 4 monitoring system include photo diode, gas flow, acoustic and spectrometer sensors. For this study, we utilize metal 3d printing system from Conception., OKE Tech and DE&T who are still developing Metal 3D Printing Technology since 2017. In the result, we represent the latest 3D Printing Control and Monitoring System for the next 3D Printing researcher and we hope this study will be used as a basic reference and data for Cooperation between mechanic, electronic and material fields.

• Proceedings of the Korean Institute of Surface Engineering Conference
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• 2018.06a
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• pp.21-21
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• 2018

다양한 소재(금속, 세라믹, 고분자 소재 등)들이 3차원 형상기반 적층제조법에 적용되고 있는데, 금속 소재를 이용하여 3D 프린팅 법으로 치과용 수복물을 제조하는 연구가 많이 보고되고 있다. 하지만, 티타늄 또는 티타늄 합금 분말을 이용하여 3D 프린팅 법으로 제작한 치과용 보철물에 관한연구 보고는 많지 않다. Kanazawa 등 (2014)은 Ti-6Al-4V 합금분말을 이용하여 SLM법으로 총의치 용 framework를 제작하여 주조법으로 제작한 것과 비교 평가하였고, Mangano 등(2013)은 Ti-6Al-4V 합금분말로 지름이 작은 일체형 (1-piece narrow-diameter) 임플란트를 SLS법으로 제작하여 16명의 환자에게 식립한 다음, 2년간 관찰하였고, Mangano 등 (2014)은 cone-beam computed tomography (CBCT) data를 3D이미지로 변환시켜 DLMS법으로 치근 형상의 임플란트를 제작하여 15명의 환자에게 식립한 다음, 1년간 관찰하였다. 또한 서울대학교 및 연세대학교 치과생체재료과학교실 (2016)에서는 3D 프린팅 법으로 제작한 티타늄 시편과 기계 가공한 티타늄 시편의 물성을 비교하였다. 그러나 티타늄 합금 분말을 이용하여 3D 프린팅 법으로 제작한 치과용 보철물을 실제 임상에 적용하는 단계에서 기존 기계가공 방식으로 제작한 티타늄 보철물과 3D 프린팅 법으로 제작한 티타늄 보철물의 물성과 표면특성을 다양하게 비교 평가하는 것이 필요하여 본 연구에서는 3D 프린팅 법으로 제작한 티타늄 시편과 기계 가공한 티타늄 시편의 물성특성과 표면특성을 비교하여 조사하였다.

• Proceedings of the Korean Society of Propulsion Engineers Conference
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• 2017.05a
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• pp.872-876
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• 2017

Laser Based 3D Printing is an recently advance manufacturing technology for making complex shape comopnent such as automobile and aerospace. So in this article, stainless steel 316L was manufactured by Selective Laser Melting (SLM) and Laser Melting Deposition (LMD) method. SLM is an additive manufacturing process that allow for the manufacture of small and complex component by laser melting and solidification of powder in bed using a high intensity laser beam. The results showed that the laser scanning speed and laser power affects the defect, microstructure and the hardness of the components.

• Journal of the Korean Society of Radiology
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• v.17 no.1
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• pp.25-30
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• 2023

As 3D printing technology is used in the medical field, interest in metal materials is increasing. The Department of Radiation Oncology uses a shielding block to shield the patient's normal tissue from unnecessary exposure during electron beam therapy. However, problems such as handling of heavy metal materials such as lead and cadmium, reproducibility according to skill level and uncertainty of arrangement have been reported. In this study, candidate materials that can be used for metal 3D printing are selected, and the physical properties and radiation dose of each material are analyzed to develop a customized shielding block that can be used in electron beam therapy. As candidate materials, aluminum alloy (d = 2.68 g/cm³), titanium alloy (d = 4.42 g/cm³), and cobalt chromium alloy (d = 8.3 g/cm³) were selected. The thickness of the 95% shielding rate point was derived using the Monte Carlo Simulation with the irradiation surface and 6, 9, 12, and 16 energies. As a result of the simulation, among the metal 3D printing materials, cobalt chromium alloy (d = 8.3 g/cm³) was similar to the existing shielding block (d = 9.4 g/cm³) in shielding thickness for each energy. In a follow-on study, it is necessary to evaluate the usefulness in clinical practice using customized shielding blocks made by metal 3D printing and to verify experiments through various radiation treatment plan conditions.

• Proceedings of the Korean Society of Propulsion Engineers Conference
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• 2017.05a
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• pp.849-855
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• 2017

The development of a staged combustion cycle engine with higher perfomance is essential to provide higher transport capability of space launch vehicles. The combustor head of engine has a cone-shaped head and its manifold of combustor has a very complicated structure. The head and manifold have been manufactured by casting or machining methode. Metal 3D printing technologies are recently known as one of promising methods to improve manufacturing process for them because they are possible to over come limitations of the two methods. In this paper, a selective laser sintering method is used to make test materials and their physical properties are studying by changing its operation parameters to establish the better processing conditions. It is found that the 3D printing method is acceptable to manufacturing the head or manifold of combustor for staged combustion cycle engine.

• Transactions of the Korean Society of Mechanical Engineers A
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• v.41 no.2
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• pp.103-109
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• 2017

Metal 3D printing, which is an additive metal manufacturing (AMM) process, enables the development of full-density metallic tools and parts using metal powders that are precisely delivered and controlled for deposition with no powder bed. However, some unknown geometric defects and irregular geometric features on an STL model can possibly result in incorrect metal part fabrication after the build. This study first proposes a methodical approach for verifying the build part, including the missing facet problems in an STL model, by defining some irregular features that possibly exist on the part. Second, 2D tool paths on each build layer were investigated for detecting any singular region inside the layer. The method was implemented for building two sample STL models using a direct energy deposition process, and finally, it was visually simulated for diagnosis.

• Journal of the Korean Society of Radiology
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• v.15 no.5
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• pp.697-704
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• 2021

It is hard to get Filaments which are materials of the 3D printing Fused Deposition Modeling(FDM) method as radiation shielding in Korea. and also related research is insufficient. This study aims to provide basic data for the development of radiation shields using 3D printing by evaluating the physical properties and radiation shielding capabilities of filaments containing metal particles. after selecting five metal filaments containing metal particle reinforcement materials, the radiation shielding rate was calculated according to the Korean Industrial Standard's protective equipment test method to evaluate physical properties such as tensile strength, density, X-ray Diffraction(XRD), and weight measurement using ASTM's evaluation method. In the tensile strength evaluation, PLA + SS was the highest, ABS + W was the lowest, and ABS + W is 3.13 g/cm³ which value was the highest among the composite filaments in the density evaluation. As a result of the XRD, it may be confirmed that the XRD peak pattern of the particles on the surface of the specimen coincides with the pattern of each particle reinforcing material powder metal, and thus it was confirmed that the printed specimen contained powder metal. The shielding effect for each 3D printed composite filament was found to have a high shielding rate in proportion to the effective atomic number and density in the order of ABS + W, ABS + Bi, PLA+SS, PLA + Cu, and PLA + Al. In this study, it was confirmed that the metal particle composite filament containing metal powder as a reinforcing material has radiation shielding ability, and the possibility of using a radiation shielding filament in the future.

• JOURNAL OF ELECTRICAL WORLD
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• s.465
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• pp.87-87
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• 2015

• Journal of the Korea Academia-Industrial cooperation Society
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• v.16 no.4
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• pp.2585-2592
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• 2015

The purpose of this study was to evaluate the shear bond strength between metal core fabricated by 3D printing and dental porcelain. Thirty metal cores were fabricated(cast 15ea, 3D printing 15ea). The porcelain for each group was builded to the metal core. Sample was loaded to shear force(crosshead speed 1mm/min) in a universal material testing machine. The fracture samples were analyzed failure aspect. The means were statistical analyzed using by Mann-whitney test(${\alpha}=0.05$). The period of experimental(metal cores fabrication, dental porcelain build up, data analysis, statistical analysis, failure aspect analysis and others) for this study took six months. The $mean{\pm}SDs$ of shear bond strength was $50.14{\pm}1.60MPa$ for the cast group, and $54.36{\pm}3.18MPa$ for the 3D printing group(p=0.035). The failure aspect showed mixed failure. As a results, metal cores fabricated by 3D printing method were clinically acceptable range.