• Title/Summary/Keyword: Paddle Shift

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A Study of Wire Sweep, Pre-conditioning and Paddle Shift during Encapsulation of Semiconductor Chips (반도체 칩 캡슐화 성형 공정에 있어서 와이어 스윕 및 패들 변형에 관한 연구)

  • Han, Se-Jin;Heo, Yong-Jeong;Lee, Seong-Cheol
    • Journal of the Korean Society for Precision Engineering
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    • v.18 no.2
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    • pp.102-110
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    • 2001
  • In this paper, methods to analyze wire sweep and paddle shift during the semiconductor ship-encapsulation process have been studied. The analysis of wire sweep includes flow-field analysis in a complicated geometry, drag-force calculation for given flow of fluid, and wire-deformation calculation for given loads. The paddle-shift analysis is used to analyze the deformation of the paddle due to the pressure difference in two cavities. the analysis is done using either analytical solutions or numerical simulation. The analytical solution is used for rough but fast calculation of wire sweep. The numerical solution is used for more accurate calculation of wire-sweep. The numerical results of wire sweep show good agreements with the experimental ones.

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Paddle Shift Analysis During Semiconductor Encapsulation (반도체 캡슐화 성형 공정에 있어서 패들 변형 해석)

  • Han, Se-Jin;Huh, Yong-Jeong
    • Journal of the Korean Society for Precision Engineering
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    • v.18 no.5
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    • pp.147-156
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    • 2001
  • 본 연구에서는 칩 캡슐화 성형 공정 중의 패들 변형을 해석하기 위한 방법론이 연구되었다. 헬레쇼오 근사 모델에 근거한 유한요소법이 칩 캐비티에서의 유동 해석을 위해 사용되었다. 리드 프레임 상의 구멍을 통한 통과 유동해석을 위한 근사모델이 제안되었다. 본 연구에서 제시된 해석모델에 의해 계산된 값과 실험 값은 잘 일치하였다. 유동해석을 통하여 리드프레임과 패들에 의해 경계를 이루고 있는 상, 하 캐비티간의 압력차가 계산되었다. 최종적으로 패들 변형이 압력차 계산 값을 이용하여 계산되게 된다.

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Design and Manufacture of a Hand-made Vehicle Based on a Formula (포뮬러 형태의 자작자동차 설계 및 제작)

  • Lee, Soo Jin;Jeong, Wonsun;Kim, Geunbi;Kim, Seong Keol
    • Journal of the Korean Society of Manufacturing Technology Engineers
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    • v.24 no.5
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    • pp.568-575
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    • 2015
  • A hand-made vehicle with a formula (VF-1) was designed and manufactured with the aim of realizing a lightweight and high-performance vehicle. The driver's body weight and stiffness of the frame were considered. The vehicle was equipped with a one-cylinder Exiv 250 engine with intake manifold potting for realizing weight reduction, high performance, and low cost. The suspension system for the formula was designed through the analyses and tests of vehicle motion and equipment. In a steering system, anti-Ackerman geometry was introduced to increase the transverse force during cornering. A full electric paddle shift system was adopted to decrease the braking distance. For protection against the distortion and warping of the frame, tungsten inert gas (TIG) welding technology was used.