• 제목/요약/키워드: Shape deposition manufacturing

검색결과 60건 처리시간 0.02초

Direct Laser Melting 공정시 분말 형태가 적층 품질에 미치는 영향 (Effect of Powder Morphology on the Deposition Quality for Direct Laser Melting)

  • 이성훈;길태동;한상욱;문영훈
    • 소성∙가공
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    • 제25권3호
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    • pp.195-202
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    • 2016
  • Direct laser melting(DLM) is an additive manufacturing process that can produce parts by solidification of molten metallic powder layer by layer. The properties of the fabricated parts strongly depend on characteristics of the metallic powder. Atomized powders having spherical morphology have commonly been used for DLM. Mechanical ball-milling is a powder processing technique that can provide non-spherical solid powders without melting. The aim of the current study was to investigate the effect of powder morphologies on the deposition quality in DLM. To characterize the morphological effect, the performances of spherical and non-spherical powders were compared using both single- and multi-track DLM experiments. DLM experiments were performed with various laser process parameters such as laser power and scan rate, and the deposition quality was evaluated. The surface roughness, cross-section bead shape and process defects such as balling or non-filled area were compared and discussed in this study.

FDM에서 단면오차법을 이용한 표면예측 (An Estimation on Area Error For Surface Roughness Advancement of Rapid Prototype by FDM)

  • 전재억;김수광;황양오;박후명;하만경
    • 한국정밀공학회:학술대회논문집
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    • 한국정밀공학회 2003년도 춘계학술대회 논문집
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    • pp.1869-1872
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    • 2003
  • As SLA(Sterealithography), SLS(Selective Laser Sintering), LOM(Laminated Object Manufacturing), FDM(Fused Deposition Modeling) etc. The FDM system the heart of a study and is developed by Stratasys co. ltd, in US., is small and cheap R.P. The material filament is heated until the material reaches a near-liquid state, it is pumped through a nozzle and become hand with a shape required, and this nozzle move pumping on the previously deposited material. Such FDM system that choice deposition type with X-Y plouter obtain in the thin continue layer by decreasing amount of extrusion or to central the injection amount when the head slow down at the corner, but in the process that fusion wax or resin become hand, deformation occur and it will affect the shape accuracy and the surface roughness. Such effect will depreciate quality and reliability of the product. Therefore, when the product made in actuality, the fundamental study on the basis geometry(surface, volume, line, angle) must be preceded and it have been research by many Free Form Fabrication. So, this basic object study purpose to obtain the fundamental geometry data and to enhance the surface roughness of the shape. And an operant can use the data for the progress of the surface roughness. This study research the estimation and application of the prototype surface roughness by adjustment the injection amount. And basie of this research, describe the pattern of prototype surface roughness and also used the result to estimate the surface of prototype.

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미소가속도계 센서의 제조공정에서 잔류응력 해석 (Analysis of Residual Stresses at Manufacturing Precesses for Microaccelerometer Sensors)

  • 김옥삼
    • Journal of Advanced Marine Engineering and Technology
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    • 제25권3호
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    • pp.631-635
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    • 2001
  • The major problems associated with the manufacturing processes of the microaccelerometer based on the tunneling current concept is the residual stress. This paper deals with finite element analysis of residual stress causing pop up phenomenon which are induced in micromachining processes for a microaccelerometers sensor using silicon on insulator(SOI) wafer. After heating the tunnel gap up to $100^{\circ}C$and get it through cooling process and the additional beam up to $80^{\circ}C$get it through the cooling process. We learn the residual stress of each shape and compare the results with each other, after heating the tunnel gap up to $400^{\circ}Cduring$ the Pt deposition process. The equivalent stresses produced during the heating process of focused ion beam(FIB) cut was also to be about $0.02~0.25Pa/^{\circ}C$and cooling process the gradient of residual stresses of about $8.4\{times}10^2Pa/{\mu}m$ still at cantilever beam and connected part of paddle. We want to seek after the real cause of this pop up phenomenon and diminish this by change manufacturing processes of microaccelerometer sensors.

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3D 프린팅 방식의 적층방향에 따른 시제품의 기계적 특성 비교에 관한 연구 (A Study on the Comparison Mechanical Properties of 3D Printing Prototypes with Laminating Direction)

  • 박찬;김명훈;홍성무;고정상;신보성
    • 한국생산제조학회지
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    • 제24권3호
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    • pp.334-341
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    • 2015
  • This paper summarizes the results of an investigation into the environmental factors that have an indirect impact on parts quality, as well as those process variables and modeling information that have a direct impact. The effects of strength, surface hardness, roughness, and accuracy of shape, that is, qualities that users generally need to know, were evaluated with laminating direction experimentally. The 3D printing methods used in this experiment were fused deposition modeling (FDM), stereolithography apparatus (SLA), selective laser sintering (SLS), 3D printing (3DP) and laminated object manufacturing (LOM). The goal was to achieve a high standard of quality control and product quality by optimizing the fabrication process.

채우기 조건에 따른 3D 프린팅 TPU 샘플의 압축 특성 (Compressive Properties of 3D Printed TPU Samples with Various Infill Conditions)

  • 정임주;이선희
    • 한국의류학회지
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    • 제46권3호
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    • pp.481-493
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    • 2022
  • This study investigated process conditions for 3D printing through manufacturing thermoplastic polyurethane (TPU) samples under different infill conditions. Samples were prepared using a fused deposition modeling 3D printer and TPU filament. 12 infill patterns were set (2D: grid, lines, zigzag; 3D: triangles, cubic, cubic subdivision, octet, quarter cubic; 3DF: concentric, cross 3D, cross, honeycomb), with 3 infill densities (20%, 50%, 80%). Morphology, actual time/weight and compressive properties were analyzed. In morphology: it was found that, as infill density increased, the increase rate of the number of units rose for 2D and fell for 3DF. Printing time varied with the number of nozzle movements. In the 3DF case, the number of nozzle movements increased rapidly with infill density. Sample weight increased similarly. However, where the increase rate of the number of units was low, sample weight was also low. In compressive properties: compressive stress increased with infill density and stress was high for the patterns with layers of the same shape.

집속이온빔의 전류변화에 따른 미세가공 특성분석 (FIB Machining Characteristic Analysis according to $Ga^+$ Ion Beam Current)

  • 강은구;최병열;홍원표;이석우;최헌종
    • 한국공작기계학회논문집
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    • 제15권6호
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    • pp.58-63
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    • 2006
  • FIB equipment can perform sputtering and chemical vapor deposition simultaneously. It is very advantageously used to fabricate a micro structure part having 3D shape because the minimum beam size of ${\Phi}10nm$ and smaller is available. Since general FIB uses very short wavelength and extremely high energy, it can directly make a micro structure less than $1{\mu}m$. As a result, FIB has been probability in manufacturing high performance micro devices and high precision micro structures. Until now, FIB has been commonly used as a very powerful tool in the semiconductor industry. It is mainly used for mask repair, device correction, failure analysis, IC error correction, etc. In this paper FIB-Sputtering and FIB-CVD characteristic analysis were carried out according to $Ga^+$ ion beam current that is very important parameter for minimizing the pattern size and maximizing the yield. Also, for FIB-Sputtering burr caused by redeposition of the substrate characteristic analysis was carried out.

ESD 전극을 이용한 분무코팅 균일도 개선에 관한 연구 (Improvement of Spray Coating Uniformity using ESD Electrodes)

  • 당현우;양성욱;도양회;최경현
    • 한국기계가공학회지
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    • 제15권2호
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    • pp.118-124
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    • 2016
  • In this study, experiments are conducted to improve spray coating uniformity by using second and third electrodes based on the electrospray atomization mechanism. The uniformity of fabricated thin films can be improved by adjusting the design of the second electrode. The implementation of the second electrode with an elongated hole and a bending angle of $90^{\circ}$ results in highly uniform films. In addition, induced area to substrate is increased by lowering the applied voltage using the third electrode with a round rod shape. A linear correlation between applied voltage and induced area is confirmed. Thin film thickness and surface roughness are measured after the fabrication of thin films through the electrospray process. It is confirmed that a thin film is formed having an average thickness of 273.44 nm, a thickness uniformity of less than 10%, and a surface roughness of 3 nm.

임의 형상 제작 기법을 이용한 3차원 세포지지체 제작에 관한 연구 (A Study on the Fabrication of 3D Scaffolds Using the Solid Freeform Method)

  • 최도현;김현철
    • 한국기계가공학회지
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    • 제18권2호
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    • pp.44-51
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    • 2019
  • With the goal of tissue regeneration for organs damaged through an accident or a disease, research on tissue engineering has been conducted to produce 3-D scaffolds that can support the cells in the attachment and growth for the cell proliferation and differentiation. A scaffold requires a suitable pore size and porosity to increase the nutrient circulation or oxygen supply for the attachment and growth of cells. The existing production methods such as solvent-casting particulate leaching, phase separation, and fiber bonding have certain disadvantages. With these methods, it is difficult to obtain a free desired shape. In addition, certain pore sizes and interconnectivities among the pores may not be guaranteed. To solve these problems, this study has fabricated a scaffold with a 3-D shaped nose using Alginate, which is a natural polymer obtained through Fused Deposition Modeling (FDM), one of the CAD/CAM-based Solid Freeform Fabrication (SFF) methods.

메니스커스 제어를 위한 정전기력 헤드용 공압 잉크공급장치 개발 (Development of Pneumatic Ink Supply System for Electrostatic head on Meniscus control)

  • 양영진;고정범;당현우;김형찬;최경현;조경호
    • 한국정밀공학회지
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    • 제29권4호
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    • pp.455-460
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    • 2012
  • The Electrostatic Inkjet system has many applications in cost and time effective manufacturing of printed electronics like RFIDs, OLEDs and flexible displays etc. This paper presents pneumatic ink supply system for an electrohydrodynamic deposition (EHD) setup for the precise pressure control to produce a small amount of discharge at the end of the capillary. The meniscus shape depends upon the applied pneumatic pressure to the ink supply system. Furthermore, this paper also compares meniscus shapes at different applied pneumatic pressures. It is concluded that patterning of constant line-width can be achieved better by controlling the meniscus shape using this technique.

마이크로가속도계의 열응력에 대한 유한요소해석 (Finite Element Analysis for Thermal Stresses of Microaccelerometers)

  • 김옥삼
    • 한국마린엔지니어링학회:학술대회논문집
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    • 한국마린엔지니어링학회 2000년도 춘계학술대회 논문집(Proceeding of the KOSME 2000 Spring Annual Meeting)
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    • pp.100-104
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    • 2000
  • This paper deals with finite element analyses of residual stresses causing popping up which are induced in micromachining processes of a mcroaccelerometers. After heating the tunnel gap up to 100 degree and get it through the cooling process and the additional bean up to 80 degree and get is through the cooling process. We learn the thermal internal stress of each shape and compare the results with each other after heating the tunnel gap up to 400 degree during the Pt deposition process. We want to seek after the real cause of this pop up phenomenon and diminish this by change manufacturing processes of microaccelerometer by electrostatic force.

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