• Title/Summary/Keyword: 적층조형

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Software Development for Automatic Generation of Unit Shape Part for Variable Lamination Manufacturing Process (가변 적층 쾌속 조형 공정 개발을 위한 단위형상조각 자동 생성 소프트웨어 개발 및 적용 예)

  • Lee, Sang-Ho;Kim, Tae-Hwa;An, Dong-Gyu;Yang, Dong-Yeol;Chae, Hui-Chang
    • Journal of the Korean Society for Precision Engineering
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    • v.18 no.8
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    • pp.64-70
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    • 2001
  • In all the Rapid Prototyping (RP) techniques, the computer-aided design (CAD) model of a three-dimensional part is sliced into horizontal layers of uniform, but not necessarily constant, thickness in the building direction. Each cross- sectional layer is successively deposited and, at the same time, bonded onto the previous layer. The stacked layers form a physical part of the model. The objective of this study is to develop a software for automatic generation of unit shape part(USP) for a new RP process, Variable Lamination Manufacturing using the linear hotwire cutting technique and expandable polystyrene foam sheet as part material(VLM-S). In order to examine the applicability of the developed software to VLM-S, USPs of general three-dimensional shapes, such as an auto-shift lever knob and a pyramid shape were generated.

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Development of a Photopolymer-based Flexible Tactile Sensor using Layered Fabrication and Direct Writing (적층조형과 직접주사방식을 결합한 광경화성 수지 기반의 신축성 촉각센서의 제작)

  • Woo, Sang Gu;Lee, In Hwan;Kim, Ho-Chan;Lee, Kyung Chang;Cho, Hae-Yong
    • Journal of the Korean Society of Manufacturing Process Engineers
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    • v.13 no.2
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    • pp.8-14
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    • 2014
  • Many kinds of robots and machines have been developed to replace human laborin industrial and medical fields, as well as domestic life. In these applications, the device sneed to obtain environmental data using diverse sensors. Among such sensors, the tactile sensor is important because of its ability to get information regarding surface texture and force through the use of mechanical contact. In this research, a simple tactile sensor was developed using the direct writing of pressure sensitive material and layered fabrication of photocurable material. The body of the sensor was fabricated using layered fabrication, and pressure sensitive materials were dispensed between the layers using direct writing. We examined the line fabrication characteristics of the pressure sensitive material according to nozzle dispensing conditions. A simple $4{\times}4$ array flexible tactile sensor was successfully fabricated using the proposed process.

Accuracy Improvement in Transfer-Type Variable Lamination Manufacturing Process using Expandable Polystyrene Foam and Experimental Verification (단속형 가변 적층 쾌속 초형 공정(VLM-ST)을 위한 정밀도 향상에 관한 연구 및 실험적 검증)

  • Choe, Hong-Seok;An, Dong-Gyu;Lee, Sang-Ho;Yang, Dong-Yeol
    • Journal of the Korean Society for Precision Engineering
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    • v.19 no.7
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    • pp.97-105
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    • 2002
  • The use of rapid prototyping (RP) has reduced time to market, cut total costs and improved product quality by giving design and manufacturing teams the opportunity to verify and fine tune designs before committing them to expensive tooling and fabrication. In order to improve their unique characteristics according to the working principles, Variable Lamination Manufacturing process (VLM-ST) and corresponding CAD/CAM software (VLM-Slicer) is developed. The objective of this study is to improve the accuracy of VLM-ST process, and it can be done by offset fur cutting error correction, cutting path overrun fur sharp edge and reference shape generation for off-line stacking. It has been shown that, through the verification experiments for given practical shapes, the proposed algorithms are effective for diverse categories of three-dimensional shapes.

생체의료용 다공성 타이타늄 특성평가 및 표면제어 연구

  • Hyeon, Yong-Taek;Kim, Seung-Eon
    • Proceedings of the Materials Research Society of Korea Conference
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    • 2009.05a
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    • pp.47.2-47.2
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    • 2009
  • 인체의 뼈와 같은 손상된 경조직을 치료 또는 대체하기위한 정형외과용 임플란트를 설계하는데 있어 뼈의 생체역학적 특성과 유사한 성질을 갖는 다공성 지지체에 대한 연구가 최근 관심을 끌고 있다. 다공성 지지체는 조직이 원활히 재생될 수 있어야 하며, 또한 주변 조직과도 생물학적인 고착이 잘 되도록 기공들이 상호 연결된 구조를 가져야 한다. 이와 같은 다공성 지지체용 소재를 제조하기 위하여 본 연구에서는 타이타늄 분말을 사용하여 3차원 적층조형공정으로 다공성 타이타늄 지지체를 제조하였다. 제조된 다공체의 물성 및 기계적 특성을 평가하기 위하여 압축시험과 변형해석을 수행하였으며, 아울러 제조된 지지체의 생체적합성 향상을 위하여 양극산화 공정 등의 표면처리를 수행하여 그에 대한 특성을 평가하였다. 분말야금 공정으로 제조된 지지체는 골조직의 성장에 적합한 약 $300\sim400{\mu}m$의 기공 크기를 갖도록 제어하였고, 기공도는 60~75%로 제어하였다. 아울러 다공성 타이타늄의 생체적합성을 부여하기 위하여 양극산화공정으로 지지체의 표면에 Ca 및 P을 포함하는 산화층을 형성시키는 표면처리를 수행하였다. 양극산화공정에 의하여 표면에 미세기공을 포함하는 산화층을 형성시킬 수 있었으나 이와 같은 표면구조는 조골세포의 부착과 영향에는 큰 영향을 미치지 않는 것으로 확인되었다.

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Three Dimensional Layering Algorithm for 3-D Metal Printing Using 5-axis (3 차원 금속 프린팅을 위한 다중 3 차원 적층 알고리듬(3DL))

  • Ryu, Sua;Jee, Haeseong
    • Transactions of the Korean Society of Mechanical Engineers A
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    • v.38 no.8
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    • pp.881-886
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    • 2014
  • The purpose of three-dimensional (3-D) metal printing using 5-axis is to deposit metal powder by changing the orientation of the deposited structure to be built for the overhang or undercut feature on part geometry. This requires a complicated preprocess functionality of providing three dimensionally sliced layers to cover the required part geometry. This study addresses the overhang/undercut problem in 3-D metal printing and discusses a possible solution of providing 3-D layers to be built using the DMT(R) machine.

Modeling of Cooling Channels of Injection Mould using Functionally Graded Material (기능성 경사 복합재를 이용한 사출금형의 냉각회로 모델링)

  • Shin, Ki-Hoon
    • Transactions of the Korean Society of Mechanical Engineers A
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    • v.35 no.12
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    • pp.1647-1653
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    • 2011
  • The cycle time in injection moulding greatly depends on the cooling time of the plastic part that is controlled by cooling channels. Cooling channels are required to facilitate the heat transfer rate from the die to the coolant without reducing the strength of the die. Employing layered manufacturing techniques (LMT), a die embedding conformal cooling channels can be fabricated directly while conventional cooling channels are usually made of straight drilled hole. Meanwhile, H13 tool steel is widely used as the die material because of its high thermal resistance and dimensional stability. However, H13 with a low thermal conductivity is not efficient for certain part geometries. In this context, the use of functionally graded materials (FGMs) between H13 and copper may circumvent a tradeoff between the strength and the heat transfer rate. This paper presents a method for modeling of conformal cooling channels made of FGMs.

Evaluation of Image Uniformity and Radiolucency for Computed Tomography Phantom Made of 3-Dimensional Printing of Fused Deposition Modeling Technology by Using Acrylonitrile Butadiene Styrene Resin (아크릴로나이트릴·뷰타다이엔·스타이렌 수지와 용융적층조형 방식의 3차원 프린팅 기술로 제작된 전산화단층영상장치 팬톰에서 영상 균일성 및 X선 투과성 평가)

  • Seoung, Youl-Hun
    • Journal of radiological science and technology
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    • v.39 no.3
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    • pp.337-344
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    • 2016
  • The purpose of this study was to evaluate the radiolucency for the phantom output to the 3D printing technology. The 3D printing technology was applied for FDM (fused deposition modeling) method and was used the material of ABS (acrylonitrile butadiene styrene) resin. The phantom was designed in cylindrical uniformity. An image uniformity was measured by a cross-sectional images of the 3D printed phantom obtained from the CT equipment. The evaluation of radiolucency was measured exposure dose by the inserted ion-chamber from the 3D printed phantom. As a results, the average of uniformity in the cross-sectional CT image was 2.70 HU and the correlation of radiolucency between PMMA CT phantom and 3D printed ABS phantom is found to have a high correlation to 0.976. In the future, this results will be expected to be used as the basis for the phantom production of the radiation quality control by used 3D printing technology.

A Study of 3D Printing of Self-Customization Cast by Using Fused Deposition Modeling Technique of ABS Resin (ABS 수지의 용융적층조형방식에 의한 자가 맞춤형 부목의 3차원 출력 사례 연구)

  • Seoung, Youl-Hun
    • Journal of the Korea Academia-Industrial cooperation Society
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    • v.16 no.9
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    • pp.6019-6026
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    • 2015
  • In this study, we have tried to use 3D-printing technology, which is very useful for small amount production and individual personalization manufacturing to produce a cast customized by individual. To do this, we have made casts by the 3D printer in the method of fused deposition modeling technique using ABS(acrylonitrile butadiene styrene) resin which is thermoplastic plastics. The computed tomography of human hand part was used as the modeling of the cast and it was designed to circulate air well. As a result, an individual personalized cast that fitted well with the model part was produced. In addition, we could get more excellent radiography from the cast than the existing cast. In conclusion, this study of 3D-printing could be used as basic data when a similar designed structure in fused deposition modeling technique by ABS resin is printed out.

고속 회전 공구를 이용한 보급형 폼 전용 가공 장치 개발

  • 김효찬;이상호;양동열;박승교;안동규
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • 2004.05a
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    • pp.242-242
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    • 2004
  • 다양하게 변화하는 소비자의 요구에 만족하기 위해 제품 디자인의 빠른 변화가 요구되며 이에 따라 빠르게 3차원 형상을 구현하는 기술이 필요하게 되었다. 일반적으로 사용되는 적층 방식의 쾌속 조형기술은 고가의 재료비 및 운영비, 기능성 파트 제작의 어려움, 표면에 적층 무늬가 존재 등의 문제점이 존재한다. 그러나 기계 가공 방식의 경우 다양한 재료의 가공이 가능하고 높은 형상 정밀도가 유지되는 장점이 있다. 특히, 폼을 이용하여 3차원 형상을 구현하는 방법은 현업에서 많이 사용되고 있다.(중략)

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Development of a Three Dimensional Control System for Implementing Rapid Prototyping Technology (쾌속조형기술의 구현을 위한 3차원 제어시스템 개발)

  • Cho, Sung-Mok
    • Journal of the Korea Academia-Industrial cooperation Society
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    • v.8 no.4
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    • pp.775-780
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    • 2007
  • Rapid Prototyping (RP) is a technology that produces prototype parts from 3D computer aided design model data without intermediate processing technology rapidly. CAD model data are created from 3D object digitizing systems but presented just as 2D data when they are printed as a hard copy or displayed on a monitor. However, Rapid Prototyping Technology fabricates 3D objects the same that CAD data because it transforms designed 3D CAD data into 2D cross sectional data, and manufactures layer by layer deposition sequentially. But most of all the small and medium scale companies which produce a toothbrush, a toy and such like provisions are in difficult situations to buy RP system because it is very expensive. In this paper, we propose a 3D control system adopting open source programs for implementing Rapid Prototyping Technology in order that RP system can be purchase at a moderate price.

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