• Title/Summary/Keyword: 병렬공작기계

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Analytical Prediction of Chatter for Parallel Machine Tool (병렬형 공작기계의 채터 예측)

  • Kim, Taek-Soo;Hong, Dae-Hie;Choi, Woo-Chun;Song, Jae-Bok
    • Proceedings of the KSME Conference
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    • 2001.06c
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    • pp.202-206
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    • 2001
  • Machine tool chatter is the self-excited vibration generated by chip thickness variation and severely degrades the quality of machined surface. The incidence of chatter is greatly affected by the dynamic characteristics of machine tool structure. Therefore, the cutting dynamics in the parallel machine tool is to be carefully studied considering the dynamic characteristics of parallel mechanism. In this paper, the vibration model of parallel machine tool is derived, in which the legs of the parallel mechanism are considered as spring-damper systems. The chatter stability charts for various machining parameters are examined with the example of the cubic parallel mechanism that is specially designed for machine tool use.

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Interpolator Design for Cubic Parallel Manipulator (육면형 병렬공작기계의 보간기 설계)

  • Kim, H.;Hong, D.;Choi, W. C.;Song, J.-B.
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • 2001.04a
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    • pp.492-495
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    • 2001
  • In order to utilize a parallel machine tool for CAM system, the development of adequate interpolator is necessary. This paper presents a quintic B-spline interpolator with algorithm of limiting maximum interpolation error. The favored property of near arc-length parametrization in the curve representation is used in the implementation of the reference command generation. Then, this interpolator is applied to cubic parallel manipulator to show its validity.

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Contour Control Algorithm for Parallel Machine Tool (병렬형 공작기계를 위한 윤곽제어 알고리즘)

  • 이승환;홍대희;최우천;송재복
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • 2002.10a
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    • pp.1003-1006
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    • 2002
  • In machining free-form curves with a machine tool equipped with parallel device, improving contouring accuracy is very important. In this paper, we present contouring control algorithm far parallel machine tool. The relation between the error in Joint space and the error in catesian space is evaluated, and we estimate contouring error vector which efficiently determines the variable gains for the cross coupled control. To show the validity of the algorithm, the contouring control is simulated for free form contour trajectory in cubic parallel machine tool model.

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Development of a Parallel-Typed CNC Machine (병렬기구형 CNC 공작기계의 개발)

  • Lee, Min-Ki;Choi, Byung-Oh;Kim, Tae-Sung;Park, Kun-Woo
    • Proceedings of the KSME Conference
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    • 2000.11a
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    • pp.535-540
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    • 2000
  • This paper presents the development of a Parallel-Typed CNC Machining Tool. It is specially designed to machine a complex shaped workpiece by controlling the orientation of the tool. The inverse/direct kinematics of a parallel mechanism is derived and implemented in a PC based controller. With graphics icons, the GUI (Graphic User Interface) program is developed for the CNC programing. The calibration is accomplished by geometric constraint motion, which is a parallel motion of the platform with respect to a table. The calibration result is introduced and the future study is proposed.

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Study on Development of Parallel-Typed Tilting Table and RAD Tool Program (병렬기구형 틸팅 테이블 및 RAD Tool 프로그램 개발에 관한 연구)

  • 김태성;박성민;원동희;이민기;박근우
    • Proceedings of the Korean Society of Machine Tool Engineers Conference
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    • 2002.04a
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    • pp.284-289
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    • 2002
  • In this paper, we develop a six-axes machining center tool(MCT) and CAD/CAM system based RAD Tool Program. The MCT consists of two mechanical parts, i.e., a X-Y-Z Cartesian coordinate typed MCT and a parallel-typed tilting table. Kinematics and singularity are accomplished to design the parallel-typed tilting table, and RAD Tool Program Is developed for the six-axes MCT, which requires the commands of position as well as orientation for machining of complex shape. In RAD Tool, the CAD/CAM system has a tool path generator, NC code generator and a graphic simulator. This paper designs the parallel-typed tilting table to meet the desired specification and presents the results of CAD/CAM system based RAD Tool Program.

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Design of a Machine Tool containing a 3-strut Parallel Kinematic Structure (병렬구조 머시닝센터 설계기술)

  • Kim, Tae-Jung;Kim, Suk-Il;Nah, Seung-Pyo;Kim, Ki-Tae
    • Journal of the Korean Society for Precision Engineering
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    • v.28 no.8
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    • pp.878-885
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    • 2011
  • A kinematically-hybrid 5-axis machine tool is analyzed from the perspective of machine tool design. Its kinematic characteristics are pointed out, which should be considered during the conceptual design process. A result of the structural analysis of the machine is presented, which is performed during the detailed design process. It is also presented how we improve the thermal characteristics of the machine tool by changing the installation position of the actuators.

Analysis on Kinematic Characteristics of a Machine Tool Parallel Manipulator Using Neural Network (신경망을 이용한 공작기계 병렬 매니퓰레이터의 기구학 특성 분석)

  • Lee, Je-Sub;Ko, Jun-Bin
    • Transactions of the Korean Society of Machine Tool Engineers
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    • v.17 no.3
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    • pp.1-7
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    • 2008
  • This paper describes the kinematics which is a new type of parallel manipulator, and the neural network is applied to solving the forward kinematics problem. The parallel manipulator called it as a Stewart platform has an easy and unique solution about the inverse kinematics. However, the forward kinematics is difficult to get a solution because of the lack of an efficient algorithm caused by its highly nonlinearity. This paper proposes the neural network scheme of an Newton-Raphson method alternatively. It is found that the neural network can be improved its accuracy by adjusting the offset of the obtained result.