• 한국정밀공학회:학술대회논문집
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• 한국정밀공학회 2003년도 춘계학술대회 논문집
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• pp.373-377
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• 2003

Recently, advanced manufacturing systems with high speed and intelligence have been developed for the betterment of machining ability. In this case, reliability prediction work with motion characteristic evaluation of sliding cover(C-plate, Bellows, etc) has also important role from design procedure to manufacturing and assembly process. Accordingly in this study, H/W test-bed system for reliability evaluation of sliding cover has been developed to obtain proper reference data for design of new model, prevention trouble (failure mode), and improvement of quality and lift cycle extremely for advanced mother machinery.

• 한국정밀공학회지
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• 제22권7호
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• pp.146-154
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• 2005

Recently, the high-speed and intelligence technology of machine tools are developed for the high efficiency of productivity Under the operating condition from the high-speed of machine tools, the various failure modes can occur in core units of manufacturing system. Therefore it is for the reliability concept of machine tool to be required in a design level. And the above-stated technology must be accommodated in the feeding and spindle subsystem, etc those are the core units of machine tools. In this study, we are developed the test-bed of sliding cover (C-plate) in order to evaluating reliability and estimating failure modes of feeding subsystem under operating conditions. The reliability experiment using the developed test-bed and the additional structural analysis executed on single and double structure. We found out the weak parts of sliding cover and were able to predict a life cycle from the experiment results. In this study, we propose the new C-plate model with double link structure to apply the high-speed machine tool in the fundamental guideline.

• 한국생산제조학회지
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• 제25권5호
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• pp.373-379
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• 2016

Low carbon steel is usually used as the outer panel with low base metal resistance compared to the inner reinforced panel made with high strength steel, which makes it difficult to form a robust nugget. To overcome welding problems of a dissimilar three-sheet combination made of SGACEN, DP980 and CP1180, a cover plate was inserted between the upper electrode and SGACEN. The quality of the nugget was analyzed by comparing the welding signals and cross sectional images under maximum heat input both with and without the cover plate. To analyze the mechanical of weld properties, a hardness test analysis was conducted. To enhance the reliability of experimental results, temperature distributions were obtained using a simulation program. The method of inserting a cover plate led to a change in the heat input, which induced a larger nugget size between SGACEN and DP980.

• 한국방재학회 논문집
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• 제7권1호통권24호
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• pp.11-20
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• 2007

본 연구에서는 H형 기둥-보 접합부에서 스캘럽 주변의 파단을 피하기 위해 스캘럽을 생략하고 보와 기둥의 쉬어탭을 볼트로 체결한 후 보 플랜지의 양면에 커버 플레이트와 리브로 보강하는 방법을 제안하였다. 스캘럽을 생략함으로써 스캘럽에서의 응력집중의 빈도를 줄이고 용접부 주위에서의 취성파괴를 방지하여 건축물의 내진성능을 향상시키는데 본 연구의 목적을 둔다. 본 목적을 위해 총 4개의 실험체를 제작하고 반복 가력 실험을 실시하였다. 주요 실험변수는 패널존 강도비이고 실험체의 항복강도, 초기강성, 총소성회전에 대한각 부재의 기여도, 에너지 소산능력으로부터 제작된 실험체들이 특수모멘트골조 내진규정에 만족을 하는지와 실험에 사용된 변수에 대한 여러 영향을 밝히고자 하였다. 그 결과 모든 실험체는 층간변위 4%, 총소성회전 0.03rad.에 충분이 도달하여 1997 AISC의 내진규정에 따라 특수모멘트골조에 만족할 것이라 판단된다.