• Title, Summary, Keyword: STL

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Offset of STL Model Generated from Solid Model (솔리드 STL 모델의 옵셋 방법)

  • Kim, Su-Jin;Yang, Min-Yang
    • Journal of the Korean Society for Precision Engineering
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    • v.22 no.9
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    • pp.202-211
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    • 2005
  • This paper introduces and illustrates the results of a new method fer offsetting triangular mesh by moving all vertices along the multiple normal vectors of a vertex. The multiple normal vectors of a vertex are set the same as the normal vectors of the faces surrounding the vertex, while the two vectors with the smallest difference are joined repeatedly until the difference is smaller than allowance. Offsetting with the multiple normal vectors of a vertex does not create a gap or overlap at the smooth edges, thereby making the mesh size uniform and the computation time short. In addition, this offsetting method is accurate at the sharp edges because the vertices are moved to the normal directions of faces and joined by the blend surface. The method is also useful for rapid prototyping and tool path generation if the triangular mesh is tessellated part of the solid models with curved surfaces and sharp edges. The suggested method and previous methods are implemented on a PC using C++ and illustrated using an OpenGL library.

MIMS: Web-based Micro Machining Service (MIMS: 웹기반 마이크로 머시닝 서비스)

  • Chu W.-S.;Ahn S.-H.;Kim D.-S.;Jun C.-S.
    • Korean Journal of Computational Design and Engineering
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    • v.9 no.3
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    • pp.246-252
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    • 2004
  • Presented in this Paper is a Micro Machining Service .(MIMS) based on the World Wide Web technologies. In order to ensure easy access to the service, the web browsers are used as the user interface. The pan geometry as an STL file is uploaded with process parameter for 3-axis CNC milling. Depending on the predefined user level, novice or expert, the user interface requires different parameters for process planning. An STL-based CAM resides in the server and automatically provides NC codes upon user's request. Tool-paths for scanning and pencil-cut, which are interference-free and precise, are created by the curve-based polyhedral machining method. A couple of sample parts were fabricated by a micro endmill with 127 fm diameter. From the tests, the parts fabricated by scanning followed by pencil-cut resulted in less error(within 2%) than the parts machined only by scanning tool-path.

The Study on Manufacturing Process Improvement of Rapid Prototyping by using SLC File (SLC파일을 이용한 쾌속조형장치의 가공공정 개선에 관한 연구)

  • 김태호;김민주;이승수;이준희;전언찬
    • Proceedings of the Korean Society of Machine Tool Engineers Conference
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    • pp.293-297
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    • 2004
  • This paper is described manufacturing to jewelry by using rapid prototype. At that time, the SLC file is useful for solved generating errors to part build file. Then. we have reduced the time of manufacturing complicated three-dimensional form. Generally, it is used the STL file for rapid prototype that it is necessary to considerable time when complicated firm as jewelry generated pan build file. But the SLC file is solved to problem because it consists of configuration of a section. Neter the less, Generating Part build file hate had a lot of problem when the SLC file is used.

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Offset of STL Model Generated from Multiple Surfaces (열린 STL 모델의 옵셋 방법)

  • Kim Su-Jin;Yang Min-Yang
    • Journal of the Korean Society for Precision Engineering
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    • v.23 no.7
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    • pp.187-193
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    • 2006
  • This paper introduces and illustrates the results of a new method for offsetting the triangular mesh generated from multiple surfaces. The meshes generated from each surface are separated each other and normal directions are different. The face normal vectors are flipped to upward and the lower faces covered by upper faces are deleted. The virtual normal vectors are introduced and used to of feet boundary. It was shown that new method is better than previous methods in offsetting the triangular meshes generated from multiple surfaces. The introduced offset method was applied for 3-axis tool path generation system and tested by NC machining.

Comparison of Panel STLs for Ships Measured in Laboratory and Mock-up (선박용 판넬의 음향투과손실(STL)의 실험실법 측정과 Mock-up 측정값의 비교)

  • Kim, Hyun-Sil;Kim, Bong-Ki;Cha, Sun-Il;Kim, Young-Soo
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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    • pp.69-72
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    • 2005
  • In this paper, FSTL(field sound transmission loss) measured in the mock-up is studied and compared to the STL measured in laboratory. A mock-up is built by using 6t steel plate, and two identical cabins are made where 25t or 50t panel is used to construct wall and ceiling inside the steel structure. Various wall panels and ceilings are tested, where the effects of U/T, sealing, panel thickness, ceilings are studied. It is shown that the effect of ceiling thickness is negligible and FSTL is lower than STL by 5-7 dB due to several flanking paths.

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Development of Slicing Algorithm for Rapid Prototyping Building about Big Sized Objects (대형물의 RP 작업을 위한 절단 알고리즘의 개발)

  • 채희창;강희용;유상훈;이승현;문홍렬
    • Transactions of the Korean Society of Machine Tool Engineers
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    • v.11 no.2
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    • pp.30-35
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    • 2002
  • Nowadays, as the development period of new products becomes shorter and consumer's requirement is more various, the importance of Rapid Prototyping Technology has been rapidly increased. Rapid Prototyping makes prototypes or frictional parts directly using the 3D CAD data. But RP machines can make prototypes in limit size. For making large size prototype, we slice solid which is made of STL file, and then glue sliced solid. And if contact area of part is small, union solid will be easily destroyed for going down of adhesion. So we need to expand contact area, 1 suggest making a section into stair shape. This paper is concerned with slicing solid on STL file and improving on adhesion.

A Study on Rapid Prototyping using VRML Model

  • Kim, Ho-Chan;Park, Hong-Tae;Lee, Hyoung-Kook;Lee, Seok-Hee
    • International Journal of Precision Engineering and Manufacturing
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    • v.3 no.2
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    • pp.5-14
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    • 2002
  • Internet becomes very common tool far communication and data sharing. Virtual readily(VR) on web browser, and virtual prototyping and virtual manufacturing is widely used in many engineering fields. 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 formal 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 mare realistic observation of an object for an RP system from a long remote sites in a more systematic way.

An RP Data Exchange Model Based on STEP (STEP을 이용한 신속조형용 설계정보 변환체계)

  • 이병열;지해성
    • Korean Journal of Computational Design and Engineering
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    • v.6 no.1
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    • pp.48-58
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    • 2001
  • One of the biggest problems of rapid prototyping(RP) technologies lies in their standard file format for CAD data exchange. Current methods using the de facto industry standard 'STL'have at times resulted in problems such as accuracy, redundancy, and integrity. In this paper we propose a STEP based data exchange framework for rapid prototyping systems. In this paradigm of data exchange, STEP models can be imported and converted into faceted B-rep. solid models for visualization and 2-D layer data for RP. Also an STL model, on the other hand, can be converted into a faceted B-rep. STEP model and exported as a new data exchange model with RP information.

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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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Optimization of Build Parameters in SLS Process (SLS의 공정 파라미터 최적화에 관한 연구)

  • Heo, Seong-Min;O, Do-Geun;Choe, Gyeong-Hyeon;Lee, Seok-Hui
    • Transactions of the Korean Society of Mechanical Engineers A
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    • v.24 no.3
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    • pp.769-776
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    • 2000
  • RP(Rapid Prototyping) technology is gaining its popularity in building a prototype in all industries. SLS(Slective Laser Sintering) is one of RP technologies, which is focused on tooling processes as well as three dimension solid model. There are several factors, the length and the cross-sectional area of a part, that have an effect on build setup in SLS process. In this paper, the computation on geometrical relationship is used to slice STL file and to estimate these factors. Based on these values, the build setup parameters such as the heating temperature, the laser power, and the powder cartridge feed rate are determined by neural network approaches. The test results show that the computation time is saved and the neural network approach is able to apply to get the optimal parameters of build process within an acceptable error rate.