• Title/Summary/Keyword: NC Machining

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Surface Modeling and 5-axis NC machining of Automobile Tire Model (자동차 타이어 모델의 곡면 모델링 및 5축 NC 가공)

  • Lee, Cheol-Soo
    • IE interfaces
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    • v.9 no.2
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    • pp.129-141
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    • 1996
  • Recently, the tire mold of a passenger car is made almost via aluminum casting, and it is necessary to prepare a master model of the tire for the casting. Because of the geometrical feature of tire, as well known, the master model must be machined by a 5-axis NC machine. The paper proposes a procedure to model and machine the master model. The approach includes (a) transformation of 2D drawing of tire into 3D geometry, (b) modeling surfaces of tire, and (c) inverse kinematics of a 5-axis NC machine. An implementation of the proposed procedure is also presented.

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A CAD/CAM System for Plate Cams with Three CNC Interpolation Methods (세가지 보간방법을 이용한 평판 캠의 CAD/CAM 시스템)

  • 김찬봉;양민양
    • Transactions of the Korean Society of Mechanical Engineers
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    • v.15 no.3
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    • pp.869-879
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    • 1991
  • 본 연구에서는 여러가지 평판 캠 기구에 대하여 효율적이며 정밀한 설계 및 가공을 할 수 있도록 CAD/CAM 소프트웨어를 개발하는데 목적이 있다. 즉, 주어진 캠 곡선과 캠 기구의 구성조건을 바탕으로 포락선 이론에 의하여 캠 형상을 구하고, 원하 는 가공 방법을 선정하여 황삭가공과 정삭가공에 대한 NC 파트프로그램을 얻는 기능들 을 하나의 통합된 CAD/CAM 소프트웨어로 구성하여 생산성과 효율성 및 정밀성 향상에 기여하고자 한다.

Determining machining configuration for NC machining of free surfaces (자유곡면 가공을 위한 Machining configuration 결정에 관한 연구)

  • 강재관;서석환
    • 제어로봇시스템학회:학술대회논문집
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    • 1992.10a
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    • pp.1084-1089
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    • 1992
  • Process planning is a key feature that an intelligent CAD/CAM system should possess. In this paper, we address the problem of determinig process configuration to manufacture the free surfaces. For analyzing the surface, the method of surface subdivision is used. The developed algorithm evaluates the processability of the given surface by applying the three/four/five-axes procedures sequentially. To illustrate and test the developed algorithm, numerical simulations are presented.

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5축 NC 가공용 CAM 시스템 개발

  • 전차수;박세형;전용태
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • 1992.04a
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    • pp.317-322
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    • 1992
  • Developed in this reseach is a CAM system for 5-axis NC Machining of sculpture surfaces. We identify problems in generating 5-axis NC data and propose methods of overcoming them. Issues discussed in this report are; kinematic modelling of NC machines; Determination of cutter position(location and orientation); check of machine work-range; linear trajectory planning; calculation of feedrate number. The proposed system has been implemented in FORTRAN77 on the Personal IRIS EWS, and it also consitutes a module of the CAD/CAM system 'CASSETTE' developed in KIST CAD/CAM lab..

Blending between machining data of surfaces (가공데이터로 주어진 곡면 간의 블렌딩)

  • S.Y. Ju;C.S. Jun
    • Journal of the Korean Society for Precision Engineering
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    • v.10 no.1
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    • pp.108-113
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    • 1993
  • This paper proposes a method for obtaining blend surfaces between machining data of surfaces. This blending algorithm consists of trangation, detection, tracing, construction of blend surfaces, and generation of machining data for the blend surfaces. Inpus of the algorithm are a blend radius and machining data of surfaces to be blended. CL data as well as CC data can be applied as an input machining data of the algorithm.

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Development of polishing tool system for robot (로보트용 금형 연마 공구 시스템의 개발)

  • 박종오;이대엽
    • 제어로봇시스템학회:학술대회논문집
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    • 1990.10a
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    • pp.190-193
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    • 1990
  • Die finishing (polishing and lapping) after NC machining is characterized as one bottleneck process for reducing lead time. For automation of this typical manual work, a flexible polishing tool system using industrial robot has been developed. This tool system has three principal functions in order to achieve reduction of waviness, 3 D.O.F. compliance and constant pressure structure. This polishing tool shows that adaptability to free form surface is increased and programmability to various areas of die surface is also acquired.

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A Study on Tool Interference Avoidance Using Rectangular Surface Approximation (가각근사에 의한 공구 간섭 제거에 관한 연구)

  • 장동규;이희관;양균의
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • 1994.10a
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    • pp.188-192
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    • 1994
  • This paper presenta new method for tool interference acoidance using rectanguar approximation in NC machining of scuptured surface. The procedure of algorithm for approximation of sculptured surface to rectangular surface is described. Using this algorithm, we can check concave, convex, and side interference region and avoid these interferenes.

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A study on the development of computer assisted manual programming system CAMP (컴퓨터 원용 수동프로그래밍 시스템 CAMP의 개발에 관한 연구)

  • 이재원;조경태;이용표
    • 제어로봇시스템학회:학술대회논문집
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    • 1988.10a
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    • pp.285-288
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    • 1988
  • Despite of the low productivity, the manual programming for NC machining is still widly used because of it's economical reasons. In this study, the computer assisted manual programming system CAMP which assits the efficient verification of MCD(Machine Control Data) is presented. The system can detect sysntax errors, graphically display tool motions and eventually diagnose programming techniques. The case study is applied for the NC turning operations.

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A 5-Axis NC Machining Strategy Support System for an Impeller (임펠러 5축 NC가공을 위한 가공전략수립 지원시스템)

  • Cho, Min-Ho;Kim, Dong-Won;Heo, Eun-Young;Lee, Chan-Gi
    • IE interfaces
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    • v.21 no.4
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    • pp.411-417
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    • 2008
  • An impeller is a type of high-speed rotor that is used to compress or transfer fluid under high-speed and pressure at high temperatures. The impeller is composed of an axial hub and several blades attached along the hub. The weight and shape of an impeller must be balanced, because their imbalances can cause noise and vibration, which can lead to the breakage of the impeller blades during operation. Thus, the hub and blades of an impeller are commonly machined in a 5-axis NC machine to obtain qualified surfaces. The impeller machining strategy or process plan can not be easily obtained due to the complex, overlapped and twisted shapes of impeller blades. Skillful machining process planners may generate appropriate machining strategies based on their experiences and floor data. However, in practice most shop floor data for the impeller machining is not well-structured such that it does not effectively provide a process planner with information for machining strategies and/or process plans. This paper reports the development of a case-based machining strategy support system (CBMS) that employs case-based reasoning to obtain the machining strategy of an impeller by using the existing machining strategies of the shop floor. The CBMS generates impeller machining strategies through a stepwise reasoning process considering the similarity features between the blade shapes and machining regions. A case study is provided to demonstrate that CBMS can generate useful machining strategies facilitating process planners. The developed system can simulate the tool paths of impeller machining and runs on the web.

Estimating Recursion Depth for Loop Subdivision

  • Wang Huawei;Sun Hanqiu;Qin Kaihuai
    • International Journal of CAD/CAM
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    • v.4 no.1
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    • pp.11-17
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    • 2004
  • In this paper, an exponential bound of the distance between a Loop subdivision surface and its control mesh is derived based on the topological structure of the control mesh. The exponential bound is independent of the process of recursive subdivisions and can be evaluated without subdividing the control mesh actually. Using the exponential bound, we can predict the depth of recursion within a user-specified tolerance as well as the error bound after n steps of subdivision. The error-estimating approach can be used in many engineering applications such as surface/surface intersection, mesh generation, NC machining, surface rendering and the like.