• Title, Summary, Keyword: STL

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A Slicer Development for CAFL$^{VM}$System (CAFL$^{VM}$ 시스템을 위한 단면정보 추출기의 개발)

  • 공용해;김기석;엄태준;방재철
    • Proceedings of the Korea Multimedia Society Conference
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    • pp.3-7
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    • 2001
  • 본 연구에서는 다종재료를 가공할 수 있는 RP(Rapid Prototyping)인 CAFL$^{VM}$의 구현을 위해 반드시 필요한 단면정보 추출기에 대하여 연구하였다. STL 3D 모형에서 단면정보를 추출하기 위해서, 패싯(facet)과 슬라이싱(slicing) 평면이 가질 수 있는 모든 경우를 고려한 알고리즘을 개발하였다. STL 파일의 구조적인 문제점 때문에 모호성과 처리량 증가 문제가 발생하지만, 본 연구에서는 창조 버퍼를 사용하여 이러한 문제점들을 효과적으로 해결하였으며, 이를 많은 STL 3D 샘플로 검증하였다.

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A Viewer Development for Various Material Agile Prototyping System (다중재료 쾌속가공시스템을 위한 뷰어 구현)

  • 천인국;김승우;안덕상;주영철
    • Proceedings of the Korea Multimedia Society Conference
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    • pp.307-311
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    • 2001
  • 신속조형시스템(RP : Rapid Prototyping)용 자료교환 표준인 STL의 자료구조는 단순하고, 조형용 2차원 단면 자료로의 전환이 용이하며, 생산 가공 기술로서의 현대적인 특성(신속성, 조형성, 경제성, 청정성 등)을 가지고 이는 장점이 있는 반면에, STL 3D 좌표값의 기준(좌표계의 원점)이 되는 크기 정보가 없다. 이런 문제를 구현된 STL 뷰어에서는, 스케일링(scaling) 기법과 선형적인 이동 기법을 사용하여 해결하였고, CAD 시스템으로 제작된 파일 자체의 문제점 패싯(facet) 중복, 정밀도, 법선 벡터 값의 오류 등도 검증기(verifier)와 오류 정정기(error corrector)글 구현하여 해결하였다. 제안된 방법으로 구현된 STL 뷰어는 시스템의 안정성과 확장성, 그리고 효율성 측면에서 우수한 성능을 보였으며, 슬라이싱(slicing), 경로 추적기(path tracer)의 전처리기의 역할을 한다.

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Delaunay triangulation for efficient reduction of measured point data (측정데이터의 효율적 감소를 위한 De Iaunay 삼각형 분할의 적용)

  • 허성민;김호찬;이석희
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • pp.53-56
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    • 2001
  • Reverse engineering has been widely used for the shape reconstruction of an object without CAD data and it includes some steps such as scanning of a clay or wood model, and generating some manufacturing data in an STL file. A new approach to remove point data with Delaunay triangulation is introduced to deal with the size problems of STL file and the difficulties in the operation of RP process. This approach can be used to reduce a number of measuring data from laser scanner within a specified tolerance, thus it can avoid the time for handing point data during modeling process and the time for verifying and slicing STL model during RP process. Developed software enables the user to specify the criteria for the selection of group of triangles either by the angle between triangles or the percentage of triangles reduced, and thus RP models with accuracy will be helpful to automated process.

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Reduction of processing time for concept printer with model splitting (모델 분할을 이용한 컨셉 프린터의 가공시간 단축)

  • Lee, In-Tak;Kim, Ho-Chan;Guen, Min-Hyung;Lee, Suk;Lee, Seok-Hee
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • pp.105-108
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    • 1997
  • To reduce design period, demands for rapid prototyping system is increasing. Among the rapid prototyping system, as a concept modeler, 3D Printer appears before the footlights. In spite of short production time and convenience, 3D Printer causes post processing problem. And that is too slow to adapt to the demand of workshop. In this research, we developed a system for reducing build time and roughness using splitting operation. Also, propose BFS(B-rep For STL) data structure to maintain model data, split STL model and implement Euler Operation for input and output.

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Development of Stereolithography system using X-Y robot (X-Y 로봇을 이용한 광조형시스템 개발)

  • 김준안
    • Journal of The Korean Society of Manufacturing Technology Engineers
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    • v.5 no.4
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    • pp.18-25
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    • 1996
  • In this study, we have developed the stereolithography system that supports the development of a products. This paper presents the development of the stereolithography system. The system is composed of hardware, software and control part. The software converts a STL file to NC data and displays the monitoring figure in control part. The hardware part deals with structure of machine. The most important theme in this paper is LG-SLCAM software. This software can generate NC data and scanning condition data from a STL file semiautimatically. On the basis of three diensional shapes, it makes data for support structure from STL file. The effectiveness of using out stereolithography system is confirmed by processes of good development.

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Measurement of sound Insulation of small-size windows (소형 창문의 차음성능 측정에 관한 고찰)

  • Kim, Sang-Ryul;Kang, Hyun-Ju;Kim, Jae-Seung;Kim, Hyun-Sil;Kim, Bong-Ki
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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    • pp.942-945
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    • 2006
  • In order to measure the sound transmission loss(STL) of a test specimen such as windows, which is smaller than the test opening, a special partition is built into the test opening and the specimen is placed in that partition. This paper discusses how the measured STL is changed by the partition when a small-size window of high sound insulation is mounted. Theoretical and experimental investigations are carried out to quantify the effect of the filler wall. The results reveal that the smaller the window size is, the higher sound insulation performance of the filler wall is required in order to measure the accurate STL of the specimen. It is found that the insufficient sound insulation of the filler wall leads to the lower measured value of the window's STL.

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A Tool for STL file modeling for 3D Printer (3D 프린터를 위한 STL 파일 모델링 도구)

  • Min, GaYoung;Choi, Sun-Hyeok;Kim, YoungGyun;Yoo, Kwan Hee
    • Proceedings of the Korea Information Processing Society Conference
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    • pp.966-969
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    • 2017
  • 3D프린터 기술의 발달로 인해 다가오는 3D프린터의 개인화 시대에 맞추어 개인이 자신이 원하는 출력물을 자유롭게 쉽게 디자인하여 물체를 출력할 수 있도록 도와주는 3D모델링 툴이다. 본 논문에서는 3D프린터 사용에 가장 일반적으로 사용되는 STL파일을 사용자가 별도의 변환과정없이 오브젝트를 바로 STL로 만들어 낼 수 있는 모델링 도구를 제시한다.

The study on the reducing of scanning path creation time using SLC file. (SLC파일을 이용한 주사경로 생성 시간 단축에 관한 연구)

  • 김태호;장성규;박정보;이준희;전언찬
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • pp.114-118
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    • 2004
  • This paper is compared the build time of scanning path as to laminate height of the SLC and STL file. The STL file improve the surface roughness according to slicing height. But it have the fault spending long time to the creation of scanning path by being lower slicing height. So we proposed the SLC file to improve this fault. Therefore this paper showed to the build time of scanning path by the increase of peace using the jewellery model.

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A Study on the Improvement of Form Accuracy Using the Length Strain of Rapid Prototype (쾌속조형장치의 길이오차를 이용한 형상정밀도 개선에 관한 연구)

  • Kim Tae Ho;Park Jae Duk;Kim Min Ju;Lee Seung-Soo;Lee Jun Hee;Jeon Eon-Chan
    • Journal of the Korean Society for Precision Engineering
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    • v.21 no.12
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    • pp.154-159
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    • 2004
  • This study is aimed to diminish the errors which created during transforming from 3D shape created with CAD program to STL file formation. The length strain which created on X-Y axises at STL file transforming is diminished by using the relation between common shape error and shrinkage rate. As the result of study, we have confirmed the length strain in accordance with facetres value. Also, the shape error is compensated with shrinkage rate by error of length strain. so, we could diminish to shape error by several tens micrometer.

Verification of Build Part and Tool Paths for Metal 3-D Printing Process (3차원 금속 프린팅 공정에서의 조형파트 진단 및 조형공구경로 검증)

  • Lee, Kyubok;Jee, Haeseong
    • 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.