• Title/Summary/Keyword: STL(Stereolithography)

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A Study on RP Part Production Using Intersecting Circle Approximation Method (교차다각형법에 의한 원 근사 방법을 적용한 RP Part 제작에 관한 연구)

  • 신근하
    • Journal of the Korean Society of Manufacturing Technology Engineers
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    • v.9 no.1
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    • pp.68-74
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    • 2000
  • The STL file format is an approximation of 3-D model with triangular facets. STL is a standard input file format of Rapid Prototyping(RP) equipment In computer graphics a circle has been approximated with an inscribed polygon which causes an error between the real and approximated circles. In this study an intersecting polygon has been used to approximate the circle and applied to produce more accurate RP part. The newly proposed method shows it's excellence in part accuracy.

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The Implementation of the Digital watermarking for 3D Polygonal Model (3차원 형상 모델의 디지털 워터마킹 구현)

  • Kim, Sun-Hyung;Lee, Sun-Heum;Kim, Gee-Seog;Ahn, Deog-Sang
    • The KIPS Transactions:PartD
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    • v.9D no.5
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    • pp.925-930
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    • 2002
  • This paper discusses techniques for embedding data into 3D polygonal models of geometry. Much researches of Watermarking had been gone as element technology of DRM (digital rights management). But, few research had gone to 3D polygonal model. Most research is limited at text document, 2D image, animation, music etc. RP system is suitable a few production in various goods species, and it is used much in industry to possible reason that produce prototype and find error or incongruent factor at early stage on design in product development childhood. This paper is research about method that insert watermark in STL ( stereolithography) file that have 3D shape model. Proposed algorithm inserts watermark in normal vector region and facet's interior region of 3D shape data. For this reason, 3D shape does not produce some flexure and fulfill invisibility of watermark. Experiment results that insert and extract watermark in normal netter region and facet's Interior region of 3D shape data by proposed algorithm do not influence entirely in 3D shape and show that insertion and extraction of watermark are possible.

Generating FE Mesh Automatically from STL File Model (STL 파일 모델로부터 유한 요소망 자동 생성)

  • Park, Jung-Min;Kwon, Ki-Youn;Lee, Byung-Chai;Chae, Soo-Won
    • Transactions of the Korean Society of Mechanical Engineers A
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    • v.31 no.7
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    • pp.739-746
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    • 2007
  • Recently, models in STL files are widely used in reverse engineering processes, CAD systems and analysis systems. However the models have poor geometric quality and include only triangles, so the models are not suitable for the finite element analysis. This paper presents a general method that generates finite element mesh from STL file models. Given triangular meshes, the method estimates triangles and makes clusters which consist of triangles. The clusters are merged by some geometric indices. After merging clusters, the method applies plane meshing algorithm, based on domain decomposition method, to each cluster and then the result plane mesh is projected into the original triangular set. Because the algorithm uses general methods to generate plane mesh, we can obtain both tri and quad meshes unlike previous researches. Some mechanical part models are used to show the validity of the proposed method.

A Study On the Boolean Operation Of STL Format (STL 포맷의 BOOLEAN 연산에 대한 연구)

  • Son, Beom-Soo;Jeon, Eon-Chan
    • Journal of the Korean Society for Precision Engineering
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    • v.22 no.9
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    • pp.194-201
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    • 2005
  • Recently, as Rapid Prototyping is attracting people's attention, many peoples are actively participating in the research on STL format. The STL files are transformed to be input for RP after modeling in CAD system. When the shape, however, needs to be changed or edited, it is impossible without the original data. So, if the original data is lost, new modeling is required. Therefore, this study suggests a way to edit the shape in STL format and to make the Boolean operation possible between the original and edited shapes. In addition, the reliability was confirmed after going over the errors of the edited data.

A Study on DB Construction for Error Modification of STL Format and Efficiency by Shape Restoration (STL 포맷의 오류수정을 위한 DB 구축과 형상복구에 의한 효율성 연구)

  • 손영지;박정보;김순경;김중완;전언찬
    • Journal of the Korean Society for Precision Engineering
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    • v.15 no.12
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    • pp.21-27
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    • 1998
  • This paper recommends the database construction for STL data and the new method of Delaunay's triangulation method in order to decrease volume errors by verifying STL file errors and modifying hole errors. Each vertex for the boundary coordinates of the verified hole errors was analyzed according to the following cases: planes or slow curves, edges, apexes, and rapid curves. In each case, a different modification process was adopted. With this method, most errors resulting from the conversion into the STL data as well as lots of volume errors arising from error modification were decreased.

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A Study on RP Part Production Using New Circle Approximation Method (새로운 원 근사방법을 적용한 RP Part 제작에 관한 연구)

  • 홍민성;신근하;박시준;최상련;오철호
    • Proceedings of the Korean Society of Machine Tool Engineers Conference
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    • pp.81-86
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    • 1999
  • The STL file format is an approximation of 3-D model with triangular facets. STL is a standard input file format of Rapid Prototyping(RP) equipment. In computer graphics, a circle has been approximated with an inscribed polygon, which causes an error between the real and approximated circles. In this study, an intersecting polygon has been used to approximate the circle and applied to produce more accurate RP part. The newly proposed method shows it's excellence in part accuracy.

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Development of 3D Printing System for Human Bone Model Manufacturing Using Medical Images (의료 영상을 이용한 인체 골 모형 제작의 3차원 프린팅 시스템 개발)

  • Oh, Wang-Kyun
    • Journal of radiological science and technology
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    • v.40 no.3
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    • pp.433-441
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    • 2017
  • The 3D printing selective laser sintering (SLS) and stereo lithography apparatus (SLA) method used for bone model production has good precision and resolution, but the printers are expensive and need professional knowledge for operation. The program that converts computed tomography digital imaging and communications in medicine (DICOM) file into STL (stereolithography) file is also expensive so requesting 3D printing companies takes a lot of time and cost, which is why they are not generally utilized in surgery. To produce bone models of fractured patients, the use of 3D imaging conversion program and 3D printing system should be convenient, and the cost of device and operation should be low. Besides, they should be able to produce big size bone models for application to surgery. Therefore, by using an fused deposition modeling (FDM) method 3D printer that uses thermoplastic materials such as DICOM Viewer OsiriX and plastic wires, this study developed 3D printing system for Fracture surgery Patients customized bone model production for many clinics to use for surgery of fracture patients by universalizing with no limit in printing sizes and low maintenance and production cost. It is expected to be widely applied to the overall areas of orthopedics' education, research and clinic. It is also expected to be conveniently used in not only university hospitals but also regular general hospitals.

STL mesh based laser scan planning system for complex freeform surfaces (STL 메쉬를 이용한 자유곡면의 레이저 측정경로 생성 연구)

  • 손석배;김승만;이관행
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • pp.595-598
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    • 2002
  • Laser scanners are getting used more and more in reverse engineering and inspection. For CNC-driven laser scanners, it is important to automate the scanning operations to improve the accuracy of capture point data and to reduce scanning time in industry. However, there are few research works on laser scan planning system. In addition, it is difficult to directly analyze multi-patched freeform models. In this paper, we propose an STL (Stereolithography) mesh based laser scan planning system for complex freeform surfaces. The scan planning system consists of three steps and it is assumed that the CAD model of the part exists. Firstly, the surface model is approximated into STL meshes. From the mesh model, normal vector of each node point is estimated. Second, scan directions and regions are determined through the region growing method. Also, scan paths are generated by calculating the minimum-bounding rectangle of points that can be scanned in each scan direction. Finally, the generated scan directions and paths are validated by checking optical constraints and the collision between the laser probe and the part to be scanned.

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Finite Element Analysis of Wrist Orthosis with 3D Printing (3D 프린트를 통해 제작된 손목 보조기의 유한요소해석)

  • Choi, Hyeun-Woo;Kang, Inyeong;Noh, Gunwoo;Seo, Anna;Lee, Jong-Min
    • Journal of the Korean Society of Radiology
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    • v.13 no.7
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    • pp.947-953
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    • 2019
  • The purpose of this study was to manufacture a wrist brace using a computerized tomography system, clinical design software (MediACE 3D Program), and 3D printer. After acquiring the Dicom file of the upper limb with a computed tomography, the wrist brace was designed using the MediACE 3D Program to create a "stereolithography" file. The designed wrist brace was printed using a 3D printer. To verify the effectiveness of wrist assistive device manufactured by 3D printing technology, the stress distribution of the pressure and orthosis applied to bone and skin is represented by finite element analysis. It is expected that the wrist brace can be manufactured by reinforcing the part where the damage caused by pressure and breakage of the brace frequently occurs with the result of finite element analysis when producing the wrist brace.

Implementation of 3D Animation using 3D Graphic SW(Blender) based on STL Files (3D 그래픽 SW(Blender)를 활용한 STL파일 기반의 3D 애니메이션 제작)

  • Kim, Jong-Jin;Kim, Jong-Seong
    • The Journal of the Korea Contents Association
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    • v.18 no.9
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    • pp.710-721
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    • 2018
  • In this study, we have suggested a method to create 3D animation based on STL files which are easily available on the internet using Blender, which is one of the most popular open-source 3D modeling SW. And the procedure of making 3D animation using STL file was compared with those for OBJ or FBX files as well. Contrary to OBJ and FBX, STL files do not contain information regarding hierarchy, material and texture which are very important in making 3D animation. Especially the absence of hierarchy may cause serious problems in rigging, which involves movement of unwanted parts of 3D object during rigging process. It is demonstrated that the weight painting feature of Blender could be a solution to tackle the faulty rigging due to attributes of STL files. The effect of the sampling frequency and the resolution on the rendering time is also investigated with respect to the 3D mantis animation. It is also seen that insect models by 3D printer could be used as a new type of pedagogical material in the elementary science education.