• Title/Summary/Keyword: 쾌속조형

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Characteristics of Roughness of Inclined Surface Fabricated by Various Rapid Prototyping Processes (여러 가지 쾌속조형 방식의 경사면 거칠기 특성)

  • Kim, Gi-Dae
    • Transactions of the Korean Society of Machine Tool Engineers
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    • v.16 no.5
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    • pp.48-54
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    • 2007
  • Surface of rapid prototype has inevitably stair-stepping error, which is attributed to the continuous building process of 2 dimensional area. In this study, rounded edge model was established to estimate the roughness of inclined surface which has stair-stepping error. To investigate the roughness of rapid prototypes, specimens that have various surface inclinations were manufactured by various types of RP machines. As the surface inclination increased, the roughness of the specimens manufactured by SL, FDM, or LOM process decreased, which coincides with the simulation results. However, surface roughness of 3DP specimen was almost independent of the inclination. Furthermore, as the angle of surface increased, roughness of poly-jet specimen also increased, which is attributed to the frictional behavior between writing head and scanned area.

Benchmark Study of Rapid Prototyping Processes and the Development of Decision-support System to Select Appropriate RP Process and Machine (쾌속조형 공정 비교실험 및 공정 선정에 관한 연구)

  • Yi Il Lang;Chung Il Yong;Choi Byung Wook;Keum Young Tag
    • Journal of the Korean Society for Precision Engineering
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    • v.22 no.11 s.176
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    • pp.202-209
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    • 2005
  • In this paper, benchmark tests of Rapid Prototyping(RP) are presented to evaluate characteristics of various RP Systems and Processes, and several decision-support systems are developed to select RP Machine/Process suitable to user's requirements. Results of the RP benchmark tests are applied to the recently developed RP machines for the purpose of analyzing attributes such as dimensional accuracy, surface roughness, build cost, build time, and etc. Decision-making support systems are also developed, which contain not only new LCE (Linear Confidence Equation) algorithm but also modified PRES and MDS algorithm. Those algorithms are proved to be effective in that reasonably acceptable results are obtained on several cases of different inputs.

Development of Surface Finishing Methodology for the Laminated Pattern Removal of VLM-ST Parts (VLM-ST 시작품의 적층무늬 제거를 위한 표면처리 방법론 개발)

  • Lee Sang-Ho;Kim Hyo-Chan;Song Min-Sup;Yang Dong-Yol
    • Journal of the Korean Society for Precision Engineering
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    • v.22 no.2
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    • pp.202-209
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    • 2005
  • A new effective thick-layered RP process, Transfer-type Variable Lamination Manufacturing using expandable polystyrene foam (VLM-ST) has been developed with thick layers and sloped surfaces. VLM-ST has the innate advantages by virtue of its working principle: high building speed, low cost for introduction and maintenance of VLM-ST apparatus, little staircase surface irregularities of parts. Despite these advantages in VLM-ST, the surface roughness of VLM-ST parts is still inadequate to be used as RP master patterns for rapid tooling (RT). This paper describes the systematic and effective methodology to remove the laminated pattern and improve the surface roughness for VLM-ST parts. From the results of surface finishing of VLM-ST parts, it can be seen that the laminated pattern is completely removed and the surface characteristics such as surface roughness, surface hardness, and paintability are improved.

A Study on Rapid Prototyping using VRML Model (VRML 모델을 이용한 쾌속조형에 관한 연구)

  • 김호찬;이주호;반갑수;최홍태;이석희
    • Journal of the Korean Society for Precision Engineering
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    • v.17 no.7
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    • pp.63-73
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    • 2000
  • Internet becomes very common tool for communication and data sharing. Virtual reality(VR) on web browser, and virtual prototyping and virtual manufacturing is widely used in many engineering folds. The reduction of overall development process and error minimization during data conversion becomes very crucial where sharing data via Internet and VR. This paper deals with the advantage and disadvantage of VRML format used in RP(Rapid Prototyping), and a software for RP data preparation is developed. If VRML format as an international standard for VR, is replaced with STL format, the weak points of STL format can be overcome and the technique related to virtual prototyping and virtual manufacturing can be addressed more systematically by sharing the data. The system developed in this work shows a good window to get access to a more realistic observation of an object fur an RP system from a long remote sites in a more systematic way.

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The influence of surface roughness on injection interval and part angle at FDM (FDM장치에서 추사간격과 시작품의 경사가 표면거칠기에 미치는 영향)

  • 하만경;전재억;정진서
    • Transactions of the Korean Society of Machine Tool Engineers
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    • v.10 no.5
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    • pp.104-109
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    • 2001
  • Nowadays, Industrial competition power is depended on that rapidly produce the customized products. Therefor, it is necessary to reduce period of product development. Thus, concurrent engineering that work many process at a time was appeared and Rapid prototyping was appeared, it is method that rapidly produce the prototype. If the graphic model was made by CAD, the prototype can be made in short term. That provide what the part was directly tested by the worker. It provide a worker with believable data. We study on the influence of surface roughness on injection interval and part angle at FDM.

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Variations of Form Accuracy in the Process of Metal Cast Prototyping using Rapid prototype, Vacuum casting and Ceramic Mold (쾌속조형과 진공주형 및 세라믹 몰드를 이용한 금속 주조 시제품 제작 공정에서의 형상정밀도 변화)

  • Kim, Gi-Dae
    • Journal of the Korean Society for Precision Engineering
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    • v.24 no.6
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    • pp.131-137
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    • 2007
  • In metal casting process, it is very difficult to predict the form accuracy of cast part and reduce repeatability error. In this study, the variations of form accuracy were measured in the process of metal cast prototyping, where RP part is manufactured from CAD model in the first, and then, wax part is cast in the vacuum environment using the RP part as master model, and finally metal prototype is cast using ceramic mold and the wax part as pattern. To investigate the variations of form accuracy, the averages and standard deviations of error distribution of the parts measured by 3D scanner were compared. It was observed that the biggest shrinkage is generated during the extraction of wax part in the second step and the biggest deterioration of form accuracy is generated during the metal part casting in the last step.

A Benchmark Study on the Stereo-lithography-type Rapid Prototyping Apparatus using Transparent Materials (투명 재료를 사용하는 광조형 방식 쾌속조형 장비의 성능 비교 시험)

  • Kim, Gi-Dae;Sung, Joo-Hyung
    • Journal of the Korean Society for Precision Engineering
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    • v.24 no.6
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    • pp.138-145
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    • 2007
  • Among various rapid prototyping processes, stereo-lithography process which can manufacture transparent prototype is known to be the greatest in the form & dimensional accuracy and surface roughness. In this paper, bench mark tests of 4 stereo-lithography-type rapid prototyping apparatus were carried out using transparent materials. The test includes measurement of mechanical properties, form accuracy, building speed and manufacturing cost. It was observed that ViperPRO of 3D systems is advantageous in the mechanical properties and building speed, RM600011 of CMET in sub-milli scale form accuracy and manufacturing cost, and relatively economical Eden500V of Objet is great in tensile strength at room temperature.

Investigation into the development of deep drawing tools with small size for electronic parts utilizing the CAE and RP/RT technology (CAE 와 쾌속조형/쾌속툴링을 이용한 전자제품용 소형 금형의 개발에 관한 연구)

  • Ahn D.G.;Lee S.H.;Kim M.S.;Han G.Y.;Kim J.S.;Moon H.S.;Yoon Y.S.
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • 2005.10a
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    • pp.334-337
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    • 2005
  • The objective of this research works is to propose a rapid development methodology of small size deep drawing tools for electronic parts utilizing the technology combination of CAE and RP/RT. The technology is applied to the development of deep drawing tools with a drain shape. The final surface of tools is obtained from the evaluation of the formability using the CAE. In order to manufacture the physical prototype of tools fer try-out terming, several fabrication experiments are carried out for three types of rapid tool manufacturing technology. Through the fabrication experiments, the acceptable rapid manufacturing technologies of deep drawing tools with a small size have been proposed.

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A Tangential Cutting Algorithm for Rapid Prototype System using Genetic Algorithm (유전자 알고리즘을 이용한 쾌속조형 경사절단 알고리즘)

  • Lee, Hyo-Jin;Chun, In-Cook;Kong, Yong-Hae;Kim, Seung-Woo;Joo, Young-Cheol;Um, Tai-Joon;Bang, Jae-Cheol
    • Proceedings of the Korea Information Processing Society Conference
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    • 2003.11a
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    • pp.343-346
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    • 2003
  • 기존 쾌속조형시스템의 단점을 보완하기 위해 본 연구팀에서 개발한 쾌속조형시스템을 수직절단에 의해 층별 성형할 경우 가공된 물체의 표면에 계단형 표면과 같은 왜곡현상이 발생한다. 이러한 왜곡 현상을 보완하기 위해 수직절단이 아닌 경사절단하여 계단형 윤곽과 같은 표면 왜곡의 문제점을 보완하고자 한다. 최적의 경사절단선분을 구하기 위해 경사절단선분의 길이와 중간층 점의 거리를 정의하여 이를 최소화하는 에너지 함수를 구현하였다. 에너지를 최소화하기 위한 알고리즘으로 급강하법을 사용하였으나, 이 방법은 에너지가 작아지는 방향으로만 움직이기 때문에 물체의 윤곽이 복잡할 경우 최적이 아닌 다른 위치에 귀착하는 지역적 최적해가 발생한다. 본 논문에서는 이러한 지역적 최적해를 벗어나 최적의 경사절단선분을 찾기 위해 유전자 알고리즘을 사용하였다. 유전자 알고리즘을 사용할 경우, 급강하법에서 발생하였던 지역적 최적해 문제가 해결되어 최적의 위치를 찾을 수 있었다.

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Investigation of Thermal Characteristics and Skeleton Size Effects to improve Dimensional Accuracy of Variable Lamination Manufacturing by using EPS Foam (발포 폴리스티렌 폼을 이용한 가변적층 쾌속조형공정의 형상 정밀도 개선을 위한 열전달 특성 및 잔여 재료폭 영향에 관한 연구)

  • 안동규;이상호;양동열
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • 2001.04a
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    • pp.910-913
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    • 2001
  • Rapid Prototyping(RP) techniques have unique characteristics according to their working principle: the stair-stepped surface of a part due to layer-by-layer stacking, low building speed, and additional post-processing to improve surface roughness. A new RP process, Variable Lamination Manufacturing by using expandable polystyrene foam(VLM-S), has been developed to overcome the unfavorable characteristics. The objective of this study is to investigate the thermal characteristics and skeleton size effects as the hotwire cuts EPS foam sheet in order to improve dimensional accuracy of the parts, which is produced by VLM-S. Empirical and analytical approaches are performed to find the relationship between cutting speed and heat input, and the relationship between maximum available cutting speed and heat input. In addition, empirical approaches are carried out to find the relationship between cutting error and skeleton size, and cutting deviation and skeleton size. Based on these results, the optimal hotwire cutting condition and available minimum skeleton size are derived. The outcomes of this study are reflecting in the enhancement of VLM-S input data generation S/W.

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