• Title/Summary/Keyword: Machine Part

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Development of System for Measurement and Evaluation for Machine tool Spindle (공작기계 주축 스핀들 종합오차 측정 및 평가기술개발)

  • 신현장;이석원;박희재
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • 1995.10a
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    • pp.1005-1008
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    • 1995
  • The spindle is a very important part of machine tool. The evaluation of spindle motion is required for improving the performance of machine tools. The evaluation tools have been developed for precison spindle by the reversal technique, and 3D error map motion of spindle is proposed. This technique makes us understand the total movement of spindle more easily. The proposed technique has been successfully applied to practical machine tools, giving high potentials for the spindle performance measurement.

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The Design of a patch Sensor for Partial Discharge diagnosis in Rotating Machine Stator Windings (회전기 고정자 권선의 부분방전 진단을 위한 평면 Patch Sensor 설계)

  • Yang, Sang-Hyun;Lim, Kwang-Jin;Park, Noh-Joon;Park, Dae-Hee
    • Proceedings of the KIEE Conference
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    • 2008.10a
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    • pp.97-98
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    • 2008
  • In 6.6kV Rotary Machine Stator Windings, Corona Discharge, Discharge at Conductor Surface, Slot Discharge and Endwinding Discharge is happended by electronic degradation. Also, if Partial Discharge cause in inner-part of Rotary Machine Stator Windings, it will be happended voltage and current pulse. In case of discharge spark, RF electromagnetic wave, which transmits at discharge position, can happen. To detect this kind of RF electromagnetic wave efficiently, we have designed Planar Antenna Sensor with the CST MWS simulation program. Also we have confined the application possibility, which can analyzes the partial discharge in Rotary Machine Stator Windings. In the Future, sample of planar antenna sensor will be able to compare with the data of simulation by CST MWS program.

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A Clustering Method using Dependency Structure and Part-Of-Speech(POS) for Japanese-English Statistical Machine Translation (일영 통계기계번역에서 의존문법 문장 구조와 품사 정보를 사용한 클러스터링 기법)

  • Kim, Han-Kyong;Na, Hwi-Dong;Lee, Jin-Ji;Lee, Jong-Hyeok
    • Journal of KIISE:Computing Practices and Letters
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    • v.15 no.12
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    • pp.993-997
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    • 2009
  • Clustering is well known method and that can be used in statistical machine translation. In this paper we propose a corpus clustering method using syntactic structure and POS information of dependency grammar. And using this cluster language model as additional feature to phrased-based statistical machine translation system to improve translation Quality.

Implementation of the High Performance Unified PID Position Controller for Linear Motor Drive with Easy Gain Ajustment Part I - Feature of the Unified PID Position Controller (이득 설계가 간단한 선형전동기 구동용 고성능 통합 PID 위치제어기 구현 제1부: 통합 PID 위치제어기 특성)

  • Kim, Jun-Seok
    • The Transactions of the Korean Institute of Electrical Engineers B
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    • v.51 no.4
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    • pp.187-194
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    • 2002
  • Recently, the application of the linear machine far industrial field is remarkable increased, especially for the gantry machine, machine tool system and CNC. In these application fields, high dynamics position control performance Is essentially required in both the steady and the transient state. This pacer presents simple but powerful position control loop based on traditional PID controller. The presented position control algorithm, named 'Unified PID Position Controller'has great features for the linear machine drives such as no over-shoot phenomena and simple gain tuning strategy. Through the experimental results with commercial linear motors, it is shown that the proposed algorithm has excellent dynamics suitable fur linear motions.

A study on thermal characteristics of linear motor for high speed machining tools (공작기계 고속이송용 리니어 모터의 열 특성에 관한 연구)

  • 정일용;강은구;이석우;최헌종
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • 2001.04a
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    • pp.98-101
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    • 2001
  • Linear motor feature a direct connection to the machine tool, therefore a direct route for heat transfer. The heat dissipation of linear motor machine is affected by the maximum temperature rise of the primary part, coil and the cooling method. To minimize temperature induced dimension changes and decrements of performance, linear motor machine require effective cooling mechanism. To evaluate cooling performance of existing linear motor machine, some experiments about temperature profile are performed using thermocouple recorder. Due to the lack of information about internal structure, only some finite element modeling is prepared and analyzed.

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A study on thermal and driving characteristics of linear motor for high speed machining tools (공작기계 고속이송용 리니어 모터의 열특성 및 운동특성에 관한 연구)

  • 최헌종;정일용;강은구;이석우
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • 1997.10a
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    • pp.414-419
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    • 1997
  • Linear motor feature a direct connection to the machine tool, therefore a direct route for heat transfer. The heat dissipation of linear motor machine is affected by the maximum temperature rise of the primary part, coil and the cooling method. To minimize temperature induced dimension changes and decrements of performance, linear motor machine require effective cooling mechanism. 1'0 evaluate cooling performance of existing linear motor machine, some experiments about temperature profile are performed and evaluated using thermocouple recorder. Due to the lack of information about internal structure. only some finite element modelling is prepared and analyzed.

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Development of the Freeform Master I - a desktop RP machine based on a new sheet lamination process (정전기 방식을 이용한 박판 적층형 쾌속조형기술에 관한 연구)

  • 박정욱;이관행
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • 2000.05a
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    • pp.767-770
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    • 2000
  • A novel process is newly developed for building RP(Rapid Prototyping) parts using a sheet lamination technique. The build process of existing sheet lamination type RP machines consists of the following steps : feeding, lamination and cutting. In this process, the laminated part of an object is often scratched by a cutter or damaged by a laser beam due to the cutting operation preceded by lamination, In addition, decubing of the unused portion from the laminated block is difficult. In the new process, cutting operation is performed before lamination. The cutting operation takes place while a paper sheet is firmly attached on the plate using electrostatic force. Then liquid glue is applied to the calculated region of the given contour for lamination. The process aims to manufacture a $2k RP machine, what we call the Freeform Mater I, that can use A4 or latter-size used papers. A prototype machine that demonstrates the design concept is built and further research issues are discussed.

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A study on Processing technology of high-speed and high-accuracy for Metal Mold Cutting (금형가공을 위한 고속.고정도 가공기술의 연구)

  • 박희영
    • Proceedings of the Korean Society of Machine Tool Engineers Conference
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    • 1999.10a
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    • pp.221-226
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    • 1999
  • It can be acquired the high effective productivity through of high speed, precision of machine tools, and then, machine tools will be got a competitive power. Industrially advanced countries already developed that the high speed feed is 50m/min using the high speed ball screw. Also, a lot of problems have happened the feed and servo drive system. It is necessary to study about the character of positioning accuracy, heat generation and high speed/accuracy control for feed/servo drive system of high speed/accuracy. In this study, we make use of high performance vertical machine center with a ball screw of large-scale-lead. Also, we'll apply the high-speed/accuracy control technology in this part of feedforward control, multi-buffering block size, etc. Using the design of the mechanical element and high-speed precision control, the basic design concept can be established.

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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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Cam Design of Packer Holder in Egg Grading Machine (계란선별기 파커홀더 캠 개발)

  • Lee, Jang-Yong
    • Transactions of the Korean Society of Mechanical Engineers A
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    • v.32 no.10
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    • pp.897-904
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    • 2008
  • Egg grading machine is used in poultry raising industry to classify eggs by their weight and to pack up them. Packer holder mechanism is a main part of the egg grading machine, of which role is to take eggs fallen from conveyor belt, and afterward to transfer eggs vertically to mold tray. The vertical motion of packer holder is usually driven by slider-crank mechanism or cam. This paper describes development of the cam in packer holder based on kinematic analysis of packer holder mechanism and measurement of acceleration and noise of the cam to verify performance of it. Several cams that are designed and manufactured by the author of this paper according to different design specification are compared to determine the best solution for egg transfer in the packer holder mechanism.