• Title, Summary, Keyword: Metal-based FDM

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Design and Analysis of Aluminum Melting Machine in Fused Deposition Modeling Method (압출 적층 방식의 알루미늄 용융기의 설계 및 해석)

  • Lee, Hyun-Seok;Na, Yeong-Min;Kang, Tae-Hun;Park, Jong-Kyu;Park, Tae-Gone
    • Journal of the Korean Society of Manufacturing Process Engineers
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    • v.14 no.4
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    • pp.62-72
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    • 2015
  • Interest in three-dimensional (3D) printing processes has grown significantly, and several types have been developed. These 3D printing processes are classified as Selective Laser Sintering (SLS), Stereo-Lithography Apparatus (SLA), and Fused Deposition Modeling (FDM). SLS can be applied to many materials, but because it uses a laser-based material removal process, it is expensive. SLA enables fast and precise manufacturing, but available materials are limited. FDM printing's benefits are its reasonable price and easy accessibility. However, metal printing using FDM can involve technical problems, such as suitable component supply or the thermal expansion of the heating part. Thus, FDM printing primarily uses materials with low melting points, such as acrylonitrile butadiene styrene (ABS) or polylactic acid (PLA) resin. In this study, an FDM process for enabling metal printing is suggested. Particularly, the nozzle and heatsink for this process are focused for stable printing. To design the nozzle and heatsink, multi-physical phenomena, including thermal expansion and heat transfer, had to be considered. Therefore, COMSOL Multiphysics, an FEM analysis program, was used to analyze the maximum temperature, thermal expansion, and principal stress. Finally, its performance was confirmed through an experiment.

Metallic FDM Process to Fabricate a Metallic Structure for a Small IoT Device (소형 IoT 용 금속 기구물 제작을 위한 금속 FDM 공정 연구)

  • Kang, In-Koo;Lee, Sun-Ho;Lee, Dong-Jin;Kim, Kun-Woo;Ahn, Il-Hyuk
    • Journal of The Korea Internet of Things Society
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    • v.6 no.4
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    • pp.21-26
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    • 2020
  • An autonomous driving system is based on the deep learning system built by big data which are obtained by various IoT sensors. The miniaturization and high performance of the IoT sensors are needed for diverse devices including the autonomous driving system. Specially, the miniaturization of the sensors leads to compel the miniaturization of the fixer structures. In the viewpoint of the miniaturization, metallic structure is a best solution to attach the small IoT sensors to the main body. However, it is hard to manufacture the small metallic structure with a conventional machining process or manufacturing cost greatly increases. As one of solutions for the problems, in this work, metallic FDM (Fused depositon modeling) based on metallic filament was proposed and the FDM process was investigated to fabricate the small metallic structure. Final part was obtained by the post-process that consists of debinding and sintering. In this work, the relationship between infill rate and the density of the part after the post-process was investigated. The investigation of the relationship is based on the fact that the infill rate and the density obtained from the post-processing is not same. It can be said that this work is a fundamental research to obtain the higher density of the printed part.

Structural Design of 3D Printer Nozzle with Superior Heat Dissipation Characteristics for Deposition of Materials with High Melting Point (고 용융점 소재의 압출적층성형을 위한 우수한 방열특성을 갖는 3차원 프린터 nozzle부 기구설계)

  • Kim, Wan-Chin;Lee, Sang-Wook
    • The Journal of the Korea institute of electronic communication sciences
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    • v.15 no.2
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    • pp.313-318
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    • 2020
  • Since the engineering plastics having a melting point of higher than 300 degrees have a high mechanical rigidity, chemical resistance, friction and abrasion performance, those are being highlighted as metal replacement materials in various industries. In this study, 3D printer nozzle with excellent heat dissipation characteristics are designed and analytically verified to form engineering plastics with high melting points in 3D printers based on the melt-lamination modeling method. In order to insulate between the heat block heated to a melting point of filament material and the upper part of the nozzle where the filament is transferred, the heat brake part with low thermal conductivity was designed to have two separate parts, and a cooling fin structure is further applied to the heat brake part to lower steady-state temperature by air convection. Optimized structural design on FDM nozzle part reduces the temperature at the heat sink and at the end part of heat brake by 50% and 14% respectively, compared to the conventional BCnozzle structure.

Immersive Visualization of Casting Solidification by Mapping Geometric Model to Reconstructed Model of Numerical Simulation Result (주물 응고 수치해석 복원모델의 설계모델 매핑을 통한 몰입형 가시화)

  • Park, Ji-Young;Suh, Ji-Hyun;Kim, Sung-Hee;Rhee, Seon-Min;Kim, Myoung-Hee
    • The KIPS Transactions:PartA
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    • v.15A no.3
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    • pp.141-149
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    • 2008
  • In this research we present a novel method which combines and visualizes the design model and the FDM-based simulation result of solidification. Moreover we employ VR displays and visualize stereoscopic images to provide an effective analysis environment. First we reconstruct the solidification simulation result to a rectangular mesh model using a conventional simulation software. Then each point color of the reconstructed model represents a temperature value of its position. Next we map the two models by finding the nearest point of the reconstructed model for each point of the design model and then assign the point color of the design model as that of the reconstructed model. Before this mapping we apply mesh subdivision because the design model is composed of minimum number of points and that makes the point distribution of the design model not uniform compared with the reconstructed model. In this process the original shape is preserved in the manner that points are added to the mesh edge which length is longer than a predefined threshold value. The implemented system visualizes the solidification simulation data on the design model, which allows the user to understand the object geometry precisely. The immersive and realistic working environment constructed with use of VR display can support the user to discover the defect occurrence faster and more effectively.