• 한국기계가공학회지
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• 제7권4호
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• pp.17-23
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• 2008

Development of die technology for holder and barrel dies is necessary according to minimization of lens assembly, image sensor, and connectors. In these cases, there are two technical problems arising from die design. One is determination of knock-out pin location in die set. Minimization of lens assembly size make it difficult to obtain ejecting space. The other is whether or not high-precision die technology is possible to reduce torque variation when holer and barrel products is assembled. In this study, multi-cavity die set was developed taking advantage of gear-driven ejecting method. In the developed technology, die manufacturing technology was guaranteed with a high-precision level.

• 대한기계학회논문집A
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• 제26권10호
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• pp.2008-2017
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• 2002

Joint structure of a transducer horn-holder assembly fur a wire bonder was examined through FEM contact analysis. A three dimensional modeling and analysis was carried out to survey the internal physics of this structure and to prove the accuracy of a computation compared to a measurement. After validation, a simple two dimensional model was built fur various parametric study considering the efficiency and speed of the computation. Several factors such as boundary conditions, a modeling boundary, mesh density and so on, were considered to obtain consistency with three dimensional analysis. An arc angle and a position of each holder boss were chosen as design parameters. A design of experiment was applied to find out an optimized design of the holder geometry. As a result, a guideline for holder boss design was suggested and main factors and their influence on stress concentration in the transducer horn were surveyed.

• 한국산학기술학회논문지
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• 제11권6호
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• pp.2013-2020
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• 2010

본 연구에서는 기존의 전형적인 토스터가 갖는 개방된 출입구로 인한 열손실 발생, 이물질의 투입, 빵을 구운 정도를 확인할 수 없음에 대한 소비자 불만족 등의 문제점을 해결하기 위해 새로운 방식의 토스터인 폴더형 캡을 갖는 투명 토스터에 대한 모델링을 연구하였다. 먼저 1차 모델링을 수행하였으며, 이어서 RP제작을 통하여 모델링에 서 확인하지 못한 문제점을 수정 및 보완하여 2차 모델링을 수행하였다. 2차 모델링에서는 메커니즘분석을 통해 홀더 간섭을 확인하여 수정하였고, 이어서 3D 모델링, 어셈블리, 시뮬레이션 분석을 통하여 폴더형 캡의 기능을 갖는 투명 토스터를 최종 모델링하였다. 본 연구에서 사용한 3D 모델링 툴은 Pro/Engineer 4.0이며, 설계된 모델링은 폴더형 캡 의 기능을 갖추어 열손실을 최소화하고, 투명한 외부케이스로 구성되어 빵 굽는 과정을 육안으로 확인하게 함으로써 심미적 만족도를 향상시키는 기능을 갖춘 폴더형 캡의 투명 토스터이다.