• Title/Summary/Keyword: 클램핑 장치

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Implementation of the rotating tool clamping device using a shape memory alloy (형상기억합금을 이용한 회전공구 클램핑 장치 구현)

  • Chung, J.M.;Park, J.K.;Lee, D.J.;Shin, W.C.
    • Transactions of the Korean Society of Machine Tool Engineers
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    • v.17 no.1
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    • pp.16-20
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    • 2008
  • This paper presents the construction of micro tool clamping device using a Ni-Ti shape memory alloy(SMA) ring. Clamping force of the device is produced by elastic force of the SMA reverted to its original shape in normal temperature. Phase transformation of the SMA was realized by temperature control using a peltier element. Prototype of the SMA tool clamping device was fabricated and examined its clamping force and clamping/unclamping operation.

Investigation for Clamping Properties of the Tool Clamping Device Based on the Shape Memory Alloy for Application of a Micro Spindle System (소형 스핀들 시스템 적용을 위한 형상기억합금 기반 공구 클램핑 장치의 체결특성 고찰)

  • Shin, Woo-Cheol;Ro, Seung-Kook;Park, Jong-Kweon;Lee, Deug-Woo;Chung, Jun-Mo
    • Transactions of the Korean Society of Machine Tool Engineers
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    • v.16 no.6
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    • pp.9-14
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    • 2007
  • In this paper, a rotating tool clamping device was developed based on a shape memory alloy(SMA) and its feasibility as a tool holder was experimentally explored. The SMA-based device was able to alter clamping to unclamping through temperature control within 1 second. The means and repeatability(${\sigma}$) of the tool clamping force were 185.5N and 6N respectively and its drifts were less than 3% for an hour. Considering the temperature hysteresis of the SMA-based tool clamping device, it is necessary to heat the SMA ring to around $50^{\circ}C$ after tool change to obtain more clamping force.

Design of the Spacer Damper with Automatic Clamping Device for Transmission Line (자동클램핑 장치형 Spacer Damper 설계)

  • Park, Jong-Beom;Ahn, Yong-Ho;Yoon, Gi-Gab;Kim, Kwang-Woo
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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    • 2000.06a
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    • pp.1790-1795
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    • 2000
  • The purpose of this papery is to introduce a new spacer damper's design for the bundle transmission lines network. It has the design, the main characteristics and advantage of this new kind of spacer damper. To reply to this problems, France, Japan and other countries had developed through many years a spacer damper with an automatic system. While the automatic clamping device are free of maintenance such as fatigue Break and aeolian vibration, imported price are so high. Now it is necessary to design, manufacture and certificate these automatic clamping device spacer damper.

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Study on the Wedge Angle of Wedge Type Rail Clamp for Container Crane (컨테이너 크레인용 쐐기형 레일 클램프의 쐐기각에 대한연구)

  • Han, Geun-Jo;Lee, Ho;Sim, Jae-Jun;Han, Dong-Sub;An, Chan-Woo;Jeon, Young-Hwan
    • Journal of the Korean Society for Precision Engineering
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    • v.21 no.9
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    • pp.119-126
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    • 2004
  • In this paper, we design a wedge type rail clamp which can protect container crane from a sudden strong blast with constant clamping force regardless of the operating period. When we design wedge type rail clamp, it is important to determine the angle of wedge and analyze a contact condition of roller and wedge so that we might develop a wedge type rail clamp for parking devices of port cargo working system with variable capacity. Therefore, this paper suggests a process to decide wedge angles within feasible range which could be obtained using load analysis and FEA of wedge type rail clamp

Design of Tool Clamping Device Based on a Shape Memory Alloy (형상기억합금 기반 공구 클램핑 장치 설계)

  • Lee, Dong-Ju;Shin, Woo-Cheol;Park, Hyung-Wook;Ro, Seung-Kook;Park, Jong-Kweon;Chung, Jun-Mo
    • Transactions of the Korean Society of Machine Tool Engineers
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    • v.17 no.5
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    • pp.70-75
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    • 2008
  • This paper describes a tool-clamping/unclamping mechanism for application of a micro-spindle. The mechanism is based on one-way shape memory effect and interference-fit. The corresponding mathematical models and a few considerable design parameters are mentioned in this paper. Especially, necessary conditions for the clamping and unclamping operation are investigated through finite element analysis. The analysis results show that the differences between the diametral deformations of the tool holder in high temperature and that in low temperature are increased according to amounts of the interference. Thus the less interference between the tool-holder and the ring, the less tolerance to allow the clamping and unclamping operation because the inner diameter of the tool holder in high temperature should be smaller than the diameter of the tool shank, and that in low temperature should be larger than the diameter of the tool shank. In addition, the design for maximization of clamping force are investigated based on finite element analysis. The results show that the more amounts of the interference, the more clamping force. As the result, the interference should be considered as a important factor to maximize the tool clamping force.

Study for weight of wedge type rail clamp according to initial clamping force (레일클램프의 원활한 클램핑과 초기체결력 발휘를 위한 중추무게의 관계에 관한 연구)

  • Han, Geun-Jo;An, Chan-Woo;Kim, Tae-Hyung;Sim, Jae-Jun;Han, Dong-Sub;Lee, Ho;Jeon, Young-Hwan
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • 2003.06a
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    • pp.1517-1520
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    • 2003
  • In this paper, we design a wedge type rail-clamp which can protect container crane from wind with constant clamping force regardless of the operating period. When we design wedge type rail clamp, it is important to determine the weight for locker to descent smoothly with an initial clamping force of rail and pad. Therefor, this paper suggest a process to decide a wright within proper range which could be obtained using FEA of wedge type rail clamp.

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A Single Stage Isolated Power Factor Correction Power Supplies using Clamping Circuit (클램핑 회로를 이용한 단계층 절연 역률 보정 전원 공급장치)

  • Seo, Jai-Ho;Lee, Hee-Seung
    • Proceedings of the KIEE Conference
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    • 1998.07f
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    • pp.2021-2023
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    • 1998
  • In this paper we further propose to add a very simple regenerative clamping circuit to SSIPP to reduce the voltage stress and to recycle the energy trapped in the leakage inductance of the isolation transformer, thus eliminating the need for a lossy snubber circuit. In addition, this proposed clamping circuit also provides a mechanism to reset the magnetizing current of the output transformer of SSIPP employing a Forward converter as the output stage. Simulations and experimental results are reported to verify the operation and performance of the SSIPP with regenerative clamping.

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Preliminary Design of AC/DC Converters for ITER Superconducting Magnet (ITER 초전도자석 전원공급장치의 예비설계)

  • Choi, J.;Oh, J.S.;Suh, J.H.;Lee, S.;Jo, S.;Jung, W.;Park, H.;Chung, I.;Hwang, K.;Liu, H.
    • Proceedings of the KIPE Conference
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    • 2012.11a
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    • pp.245-246
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    • 2012
  • ITER 초전도자석 전원공급장치의 예비설계가 실제 크기 6펄스 R&D 컨버터의 제작 및 시험결과를 기반으로 수행되었다. ITER 컨버터는 자체적으로 지지되는 알루미늄 버스바 구조로 제작되며, 이 버스바에 양면 클램핑 방식으로 조립되는 Thyristor 스위치는 4인치 규격으로써 컨버터의 종류에 따라 한 개의 암 당 8 - 16 개의 소자가 병렬로 구성된다. ITER 컨버터 예비설계는 알루미늄 버스바 구조설계, 컨버터 냉각설계, 컨버터 전기회로 설계, 컨버터 고장해석 및 보호설계, 시험절차 및 요건 등을 포함하며, 본 논문에서 그 설계결과를 기술한다. ITER 컨버터는 예비설계 결과를 기반으로 상세설계 및 제작설계를 거친 후 제작된다.

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The Design of Supporter to Prevent Overclamping in Wedge Type Rail clamp (쐐기형 레일클램프의 과클램핑 방지를 위한 지지장치 설계)

  • 한근조;안찬우;전영환;심재준;한동섭;김병진
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • 2003.06a
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    • pp.1446-1449
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    • 2003
  • In this study we analyze operation principle of wedge type rail clamp using in the harbor and when wind force applies to container crane, we calculate deformation in each part of rail clamp. As a result of calculation, we will design rail clamp supporter that forbid overload to be applied at rail clamp according to adjust climbing wedge distance of roller. It would be adapted various container capacity and wind velocity.

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Inchworm-Like Robotic Colonoscope UsingLegs for Clamping (다리를 이용한 클램핑 방식의 자벌레 이동방식 대장내시경로봇)

  • Park, Hyun-Jun;Leem, Sang-Hyuck;Kim, Byung-Kyu
    • Transactions of the Korean Society of Mechanical Engineers A
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    • v.34 no.6
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    • pp.789-795
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    • 2010
  • For the reliable clamping of a robotic colonoscope inside the colon, we propose a clamping module consisting of six legs at the front and a trigger at the rear. In addition, a pneumatic-line based locomotive mechanism, which was developed previously for in-pipe inspection, is adopted to reduce the friction force between the pneumatic lines and the locomotion environment. In order to evaluate locomotion performance, a robot with a diameter of 15 mm and a length of 110.250 mm is used. Based on control signal from LabVIEW, it is tested in acrylic pipe and pig's colon. The proposed robot is able to move in the curved path which has a radius of over 25 mm. The speed of the robot is 33 mm/s in a straight path and 12.1 mm/s on a vertical path. The proposed robot, which has one pneumatic line and two clamping modules, conclusively shows reliable locomotion performance under in vitro condition.