• 제목/요약/키워드: 컵형

검색결과 20건 처리시간 0.031초

Comparison of Plasma Jets between Two Electrode-Structures of Cylindrical Needle and Cup

  • 정종윤;한상호;김동준;김정현;김윤중;김중길;조광섭
    • 한국진공학회:학술대회논문집
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    • 한국진공학회 2011년도 제40회 동계학술대회 초록집
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    • pp.228-228
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    • 2011
  • 바늘형 전극과 컵형 전극을 사용한 대기압 플라즈마 제트 장치의 플라즈마 분출 특성을 조사한다. 바늘형 전극은 원통형 주사기 바늘을 사용하였다. 컵형 전극은 냉음극 형광 램프의 전극을 사용하였다. 방전 가스는 Ar을 사용하고 가스의 유량은 3 lpm이다. 구동 전원은 DC-AC 인버터를 사용하고 구동 주파수는 40 kHz이다. 방전 전압-전류 특성과 전류별 플라즈마 방출 길이를 측정한 결과, 원통형 바늘보다 컵형 전극이 방전 개시 전압이 낮았으며 동일 전류에서 플라즈마 방출 길이가 더 길다.

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컵형 AMF 전극의 대전류 아크집중 예측 (Prediction of High-Current Arc Constriction in a Cup-Type AMF Electrode)

  • 안정호;이종철
    • 대한전기학회:학술대회논문집
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    • 대한전기학회 2015년도 제46회 하계학술대회
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    • pp.59-60
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    • 2015
  • 본 논문에서는 상용 CAE 프로그램인 ANSYS를 이용하여 전자기해석과 유동해석을 연계 계산하였고, 전류크기를 변수로 하여 접점 사이에 발생되는 온도분포를 분석함으로써 컵형 AMF 전극의 아크집중 현상을 예측하였다.

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유한요소해석을 통한 컵형상 대형단조품의 성형공법 설계 (Forging process design of cup shaped large forging using finite element method)

  • 강종훈;김현준;이형우
    • Journal of Advanced Marine Engineering and Technology
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    • 제39권7호
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    • pp.729-734
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    • 2015
  • 본 연구는 내경부에 깊은 구멍이 있는 컵형상의 대형단조품을 형단조와 자유단조 공법을 복합하여 성형하기 위한 단조공법 개발에 관한 것이다. 제안된 단조공법은 형단조를 이용하여 예비성형체를 성형하고 코깅 공법을 이용하여 후방압출 형상을 성형하는 방법이다. 유한요소해석에서 제안된 공법이 후방압출공법에 비하여 낮은 성형하중으로 더 높은 유효변형율을 나타내었다. 제안된 공법으로 시제품을 제작하여 내부품질이 양호한 제품을 적은 용량을 프레스로 성형할 수 있음을 확인하여 제안 공법의 타당성을 검증하였다.

컵형상 분말단조품의 예비성형체 형상에 따른 단조효과에 관한 연구 (A Study on Forging Effect of Cup-Shaped Powder Forging Product According to the Shape of Preforms)

  • 박종옥;김영호;조진래;이종헌
    • 한국정밀공학회지
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    • 제17권11호
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    • pp.63-68
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    • 2000
  • The purpose of this paper is to compare the forging effects according th the shape of preforms of cup shaped powder forging product, and extend the application of powder forging technology to more complicated cup-shaped products like pistons. In order to this, preforms are provided by compacting, sintering, and machining in various shapes, then forged to final shape of products. The workability for sintered aluminium powder material is examined. Density and strain loci of forged products are compared, and the most effective shape of preform is proposed. The preform for a piston of 50mm in diameter is provided and hot forged to final product.

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컵-컵형 축대칭 복합압출에 관한 실험적연구 (An Experimental Study for the CUP-CUP Axisymmetric Combined Extrusion)

  • 김영득;한철호
    • 한국소성가공학회:학술대회논문집
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    • 한국소성가공학회 1994년도 춘계학술대회 논문집
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    • pp.175-182
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    • 1994
  • Effect of some process variables including area reduction, stroke advance, materials on the extrusion load, plastic flow and height ratio of upper to lower extruded parts in the cup-cup axisymmetric extrusion were experimentally investigated and analyzed. Deformed pattern is visualized by grid-marking technique using half-cut billets splitted. The influence of using split specimen and original specimen on the extrusion load and height ratio is examined by experiment.

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연속섬유강화 플라스틱 복합재료의 컵형 압축성형성에 관한 연구 (A Study on the Cup-Type Compression Molding for Continuous Fiber-Reinforced Poymeric Composites)

  • 오영준;김형철;조선형;김이곤
    • 한국소성가공학회:학술대회논문집
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    • 한국소성가공학회 1997년도 추계학술대회논문집
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    • pp.176-181
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    • 1997
  • During a compression molding of continuous fiber reinforced composites, the separation of matrix and fiber is caused by the flow of the molding process. As the characteristics of the products are greatly dependent on the separation, it is very important to clarify the separation in relation to molding condition, degree of needle punching number on the degree of nonhomogeneity are studied.

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줄기가 강하고 밝은 화색의 절화용 안개꽃 '더블샤인' 육성 (A New Cultivar of Gypsophila paniculata 'Double Shine' with Bright Colored Flower and Strong Stem)

  • 정동춘;최창학;송영주;임회춘;김정만;이진재;이정수
    • 원예과학기술지
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    • 제30권1호
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    • pp.93-96
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    • 2012
  • 1999년 'Bristol Fairy' 유래의 결실되는 아조변이체인 'Gyp99' 계통을 선발하였고, 계통의 실생 중 선발을 거듭한 결과, 특성이 우수한 'Gyp08-63' 계통을 선발하여 2년간 특성검정을 통해 'Double Shine' 품종을 육성하였다. 'Double Shine' 품종의 초형은 개장형이고, 잎 모양은 둥근 피침형, 소화는 꽃잎수가 많고 암술이 2개인 밝은 백색 겹꽃으로 꽃잎은 주걱형, 꽃받침 모양은 컵형인 식물체 고유 특성을 가졌다. 또한 화경이 단단하고, 흰가루병과 충해에도 강한 편이다. 여름절화 작형에서 'Double Shine' 개화는 대조품종인 'Bristol Fairy'보다 16일 늦고 절간장과 화경장이 길었으며, 측지 분화가 많고 줄기가 굵고 분지각은 작았고, 기형화 발생이 없었다.

머시닝센터를 이용한 평면 연삭가공에 관한 연구 (II) (A Study on the Surface Grinding using the Machining Center (II))

  • 이승만;최환;이종찬;정선환
    • 한국정밀공학회:학술대회논문집
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    • 한국정밀공학회 2000년도 추계학술대회 논문집
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    • pp.880-883
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    • 2000
  • Temperature generated in the workpiece during grinding process can cause thermal damages. Therefore it is important to understand surface temperature generated during grinding process. In this paper, a theoretical and experimental investigation were performed for the grinding temperature. Grinding experiments were performed in machining center using vitrified bonded CBN cup-type wheel. The surface temperature was measured using thermocouple and calculated through a model of the partition of energy between wheel and workpiece. The residual stress and hardness of ground surface were measured. The experimental results indicate that the surface temperature was in good agreement with theoretical ones. Residual stress and hardness of ground surface were more affected by the change of table speed than the depth of cut.

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상하 컵형인 전후방압출공정에 관한 실험적 연구 (An Experimental Study in the Forward-Backward Extrusion for the Cup-Cup shape)

  • 김영득;한철호
    • 소성∙가공
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    • 제3권3호
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    • pp.291-301
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    • 1994
  • In the simultaneous forward-backward extrusion the effects of some process variables including area reduction, stroke advance, materials(Al 2024 and commercial pure copper) on the extrusion load, plastic flow and height ratio of upper to lower extruded parts are experimentally investigated and analyzed. Grid-marking technique is employed to visualize the plastic flow. The influence of using split and original specimen on the extrusion load and height ratio is evaluated by experiments. Experimental results show that the plastic flow if oriented to the part of lower area reduction in the begining but it is usually variated during the overall process. The configurations of plastic deformation and plastic flow are dependent on the working materials and the lubricational conditions.

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마이크로 V홈 연삭가공을 위한 다이아몬드숫돌의 V형상 트루잉에 관한 연구 (A Study on the Truing of Diamond Wheel for Micro V-shaped Groove Grinding)

  • 이주상
    • 한국정밀공학회지
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    • 제22권9호
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    • pp.27-33
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    • 2005
  • This study deals with the truing of diamond wheel fur the manufacture of micro v-shaped grooves with fine sharp edges in the grinding. Fine micro v-shaped grooves are key components to fabricate LGP(light guide plate), optical fiber connector and so on. Conventional v-shaped groove methods such as etching and lithography are difficult to make grooves with accuracy and cutting by lathe is difficult to select target materials. Therefore, as a preliminary stage to developing the grinding technology that will be expected fabrications for micro 3-dimensional structure of high effectivity and accuracy and freed up the restrictions of machinability to the materials for micro v-shaped grooves, truing is carried out with resin bond diamond wheel and electroforming diamond wheel using a cup-type truer. From the experimental results, it is found that the effects according to working direction of the cup-type truer and the restrainable methods of plastic deformation that is generated at wheel edge are examined. As a result, fine micro v-shaped diamond wheel was obtained, which are applicable to micro grinding for optical devices.