• Title/Summary/Keyword: Cutting Path

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A study of development of Rapid Foam Shaping process using hot tool (열 공구를 이용한 쾌속 폼 가공 공정 개발에 관한 연구)

  • 김효찬;이상호;송민섭;양동열;박승교
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • 2004.10a
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    • pp.55-59
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    • 2004
  • Recently, life cycle and lead-time of products have been shortened with the demand of customers. Therefore, it is important to reduce time and cost at the step of manufacturing trial molds. In order to realize three dimensional shape on CAD, the machining process has been widely used because it offers practical advantages such as precision and versatility. However, traditional machining process spends a lot of time in cutting product and the remained material causes trouble such as inconvenience for clean. In this work, a new machining process using the hot tool has been proposed to overcome those limitations. In the process, the hot tool moves the predetermined path and the heat of the tool decomposes the remained material. In order to set up the process, the hot tool to satisfy requirements is designed and the material thermal properties are obtained using the DSC and TGA machine. The relationships between process parameters and thermal radius of the tool are obtained through experiment.

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A Tendency of Prediction Technique for the Assessment of Railway Noise (철도소음 영향평가를 위한 예측기술 동향)

  • Cho, Jun-Ho;Park, Young-Min;Sun, Hyo-Sung;Hong, Woong-Gi
    • Journal of Environmental Impact Assessment
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    • v.16 no.1
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    • pp.99-105
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    • 2007
  • Since 1990s, the railway noise has been researched and developed in our nation. First of all, what's causing the noise and how to eliminate the cause of the noise must be found out. Secondly, cutting off the propagation path of the noise from the noise source to the receiving points. In this study the characteristics of prediction formula for the assessment of railway noise used in some nations including Korea were investigated. In order to develop the prediction formula of the railway noise, the noise radiated from railway vehicle, rails and sleepers, characteristics of noise barrier, velocity of train, ground effects, roughness should be analyzed and predicted. Especially, on the basis of acoustics, the characteristics of source are applied to acoustic power and directivity information.

Generation of 5-axis NC Data for Machining Turbine Blades by Controlling the Heel Angle (Heel angle 조정에 의한 터빈 블레이드의 5축 NC가공 데이터 생성)

  • 이철수;박광렬
    • Korean Journal of Computational Design and Engineering
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    • v.4 no.2
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    • pp.110-120
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    • 1999
  • In general, turbine blades are usually machined on 5-axis NC machine. The 5-axis machining of sculptured surface offers many advantages over 3-axis machining including the faster material-removal rates and an improved surface finish. But it is difficult and time-consuming to generated interference-free 5-axis tool path. This paper describes research on the algorithm for generation of an interference-free 5-axis NC data for machining turbine blades. The approach, using the section profile derived from the intersection of cutting planes with a triangulated-surface approximation, includes (1) CL-data generation by detecting an interference-free heel angle (2) the calculation method for finding a adaptive feed-rate value, and (3) the inverse kinematics depending on the structure of 5-axis machine.

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Graphic Simulation of Material Removal Process Using Bounding Box and Base Plane (기준평면과 경계상자를 이용한 NC 절삭과정의 그래픽 시뮬레이션)

  • 이철수;박광렬
    • Korean Journal of Computational Design and Engineering
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    • v.2 no.3
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    • pp.161-174
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    • 1997
  • In this paper, the techniques for graphic simulation of material removal process are described. The concepts of the bounding box and base plane are proposed. With these concepts, a real-time shaded display of a Z-map model being milled by a cutting tool following an NC path can be implemented very efficiently. The base planes make it possible to detect the visible face of Z-map model effectively. And the bounding box of tool sweep volume provides minimum area of screen to be updated. The proposed techniques are suitable for implementation in raster graphic device and need a few memories and a small amount of calculation. Proposed method is written in C and executable on MS-Windows95 and Window-NT.

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Modeling Cutter Swept Angle at Cornering Cut

  • Chan, K.W.;Choy, H.S.
    • International Journal of CAD/CAM
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    • v.3 no.1_2
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    • pp.1-12
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    • 2003
  • When milling concave corners, cutter load increases momentarily and fluctuates severely due to concentration and uneven distribution of material stock. This abrupt change of cutter load produces undesirable machining results such as wavy machined surface and cutter breakage. An important factor for studying cutter load in 2.5D pocket milling is the instantaneous Radial Depth of Cut (RDC). However, previous work on RDC under different corner-cutting conditions is lacking. In this different corner shapes. In our work, we express RDC mathematically in terms of the instantaneous cutter engage angle which is defined as Cutter Swept Angle (CSA). An analytical approach for modeling CSA is explained. Finally, examples are shown to demonstrate that the proposed CSA modeling method can give an accurate prediction of cutter load pattern at cornering cut.

Geometric error compensation of machine tools by geometry redesign (형상 재 설계에 의한 공작기계 기하오차 보정)

  • 서성교
    • Proceedings of the Korean Society of Machine Tool Engineers Conference
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    • 2000.04a
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    • pp.367-372
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    • 2000
  • Accuracy of a machined component is determined by the relative motion between the cutting tool and the workpiece. One of the important factors which affects the accuracy of this relative motion is the geometric error of machine tools. In this study, geometric error is modeled using form shaping motion of machine tool, where a form shaping function is derived from the homogeneous transformation matrix. Geometric errors are measured by laser interferometer. After that, the local positioning error can be estimated from the form shaping model and geometric error data base. From this information, we can remodel the part by shifting the design surface to the amount of positional error. By generating tool path to the redesigned surface, we can reduce the machining error.

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Multi-stage NC Milling of Uncut Volume caused by Gouging Interference at the Machining of Curved Surfaces (곡면가공시 공구간섭에 따른 미절삭체적의 다단계 NC가공)

  • 맹희영;차지경
    • Proceedings of the Korean Society of Machine Tool Engineers Conference
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    • 2004.10a
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    • pp.439-444
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    • 2004
  • A new efficient intelligent machining strategy named the Steepest Directed Tree method is presented in this study, which makes surface model discrete with triangulation meshes and the cutter paths track along the tree directions. In order to formulate these algorithms practically, it is deduced the multi-stage machining approach of uncut volume caused by cutter gouging in the course of milling using flat end mill. It is systematized the checking process the cutter interference by grouping the 6 kinds of gouging types, which yields the environment of connectivity data lists including CL-data, and then the multi-stage machining strategy, that minimizes uncut area by continuously sequencing the generative subsequent CL-paths, is shamed to determine the second tool path for the next uncut area and to compose the operating multi-stage cutting processes. The completed machining system of curved surfaces is evaluated by testing the practical machining experiments which have various kinds of shape conditions.

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A study of three dimensional reconstruction of medical images based on the Delaunay triangulation (Delaunay triangulation을 이용한 3차원 의료영상 재구성에 관한 연구)

  • Kwon, E.C.; Kim, D.Y
    • Proceedings of the KOSOMBE Conference
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    • v.1998 no.11
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    • pp.273-274
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    • 1998
  • We construct a volume whose boundary is a tetrahedron with triangular faces intersecting the cutting planes along the given contours. This volume is obtained by calculating the Delaunay triangulation slice by slice, mapping 2D to 3D as tetrahedron. Also, eliminate extra-voronoi skeleton and non-solid tetrahedron. In this paper, we propose new method to eliminate non-solid tetrahedron based on the modified extra-voronoi skeleton path. This method enable us to do a compact tetrahedrisation and to reconstruct complex shapes.

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A study on development of plastic intake manifold module (Plastic 흡기 매니폴드 모듈 개발에 관한 연구)

  • Lee, Jeong-Kyun;Kim, Young-Bok;Joo, Kyung-Jei
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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    • 2011.10a
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    • pp.833-838
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    • 2011
  • Future powertrain technologies will be developed focused on applications of eco-friendly technology for internal combustion engine, electric vehicle and Fuel Cell Electric Vehicle. But it is expected that these cutting edge technologies will not be applied immediately due to lack of infrastructure, technical and economical reasons. Therefore, numerous developments of internal combustion engine will be carried out for the time being. There have been many turbo engine developments undergoing to maximize the engine performance using turbo charger system in accordance with global trend-green technology and downsizing of engine which coincides with HMC's future development strategy. This study reviews the development process and result of plastic intake manifold module which is firstly developed for turbo engine. CAE simulation and experiments were implanted to evaluate design validity.

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A Study on Precision Machining Technology for Disk Cams using Bi-arc Method (Bi-arc법을 이용한 평면 캠의 정밀 가공 기술에 관한 연구)

  • Shin J.H.;Kwon S.M.;Cho I.Y.;Kim J.C.;Kang H.S.
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • 2006.05a
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    • pp.235-236
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    • 2006
  • The disk cam mechanism can produce a positive motion with relatively few components. This paper introduce a shape design of cam using the relative velocity method and a precision machining technology for using Bi-arc method. The paper gives a machining information at each point using the Bi-arc method and the analysis method of the cutting error due to the moving path of the cutter, so that we can lead to the optimum design in a disk cam mechanism.

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