• 한국정밀공학회지
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• 제18권9호
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• pp.101-109
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• 2001

The simulated die casting process in which the traditional plaster casting process is combined with rapid prototyping technology is being used to produce Al, Mg and Zn die casting prototypes. Because of lower mechanical properties induced by the large grain structure and incomplete filling, conventional plaster casting is not suitable for the simulated die casting process. A plaster casting process with pressurized vibration was developed for the simulated die casting process[5]. In this paper, numerical simulation for the filling stage of the process has been performed to show the effect of the pressurized vibration for complete filling. Treatment of boundary condition based on the finite element method has been proposed for imparted pressurized vibration in the plaster casting process.

• 한국정밀공학회:학술대회논문집
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• 한국정밀공학회 2004년도 춘계학술대회 논문요약집
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• pp.264-264
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• 2004

1990년에 일본 혼다 기연공업의 고성능 스포츠카(NSX)는, 올 알루미늄합금보디등에 알루미늄을 이용, 대폭 경량화시켜 화제를 모았으며 90년 전후부터는 스포츠카나 스페셜리티카로 불리우는 고성능 승용차의 보디외판과 발주위부품에 알루미늄부품이 잇달아 채용되기 시작하였다. 알루미늄부품의 채용이 정착한 최근에 와서, 승용차의 알루미늄화 움직임에 변화가 생겼다. 90년 이전에는 승용차의 발주위부품은 알루미늄단조품으로 경량화하는 것이 보통이었는데, 91년 가을경부터, 이것을 알루미늄 주조품으로 대체하는 방향으로 흐름이 바뀌었다.(중략)

• 한국소성가공학회:학술대회논문집
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• 한국소성가공학회 2002년도 금형가공 심포지엄
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• pp.180-186
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• 2002

The simulated die-casting process in which the traditional plaster casting process is combined with Rapid Prototyping technology is being used to produce Al, Mg, and Zn die-casting prototypes. Unlike in the die-casting process, molten metal in the conventional plaster casting process is fed via a gravity pour into a mold and the mold does not cool as quickly as a die-casting mold. The plaster castings have much larger and grosser grain structure as compared as the die-castings and the thin walls of the plaster mold cavity may not be completely fillet Because of lower mechanical properties induced by the large grain structure and incomplete Idling, the conventional plaster casting process is not suitable for the trial die-casting Process. In this work, an enhanced trial die-casting process has been developed in which molten metal in the plaster mold cavity is vibrated and pressurized simultaneously. Patterns for the casting are made by Rapid Prototyping technologies and then plaster molds, which have runner system, are made using these patterns. Imparted pressurized vibration to molten metal has made grain structure of castings much finer and improved fluidity of the molten metal enough to obtain complete filling at thin walls which can not be filled in the conventional plaster casting process.

• 한국정밀공학회지
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• 제18권7호
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• pp.167-173
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• 2001

The simulated die-casting process in which the traditional plaster casting process is combined with Rapid Prototyping technology is being used to produce AI, Mg, and Zn die-casting prototypes. Unlike in the die-casting process, molten metal in the conventional plaster casting process is fed via a gravity pour into a mold and the mold does not cool as quickly as a die-casting mold. The plaster castings have much larger and grosser grain structure as compared with the normal die-castings and the thin walls of the plaster mold cavity may not be completely filled. Because of lower mechanical properties induced by the large grain structure and incomplete filling, the conventional plaster casting process is not suitable for the trial die-casting process to obtain quality prototypes. In this work, an enhanced trial die-casting process has been developed in which molten metal in the plaster mold cavity is vibrated and pressurized simultaneously. Patterns for the casting are made by Rapid Prototyping technologies and then plaster molds, which have a runner system, are made using these patterns. Pressurized vibration to imparted molten metal has made grain structure of castings much finer and improved fluidity of the molten enough to obtain complete filling at thin walls which may not be filled in the conventional plaster casting process..

• 한국산학기술학회논문지
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• 제16권4호
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• pp.2364-2369
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• 2015

본 논문에서는 고정밀 로터용 원심주조기 방식을 연구 및 개발함으로써 관련 업종의 생산성 향상을 위하여 로터의 충진율 해석을 통해 RPM에 따른 로터의 충진율을 비교해 최적의 RPM을 제시하였다. 회전속도가 600 rpm일 때 충진율 99.47%를 보여줌으로써 실제 작업현장에서의 결과와 비슷하므로 이를 토대로 추가적으로 수행하여 그 결과를 이용한다면 보다 정확한 공정설계를 할 수 있을 것으로 사료된다. 또한 소형 레이들의 전도율해석을 통하여 고품질의 주조제품이 생산될 수 있도록 적합한 소형 레이들의 온도를 분석하였다. 니크롬선을 이용한 가열장치가 없는 경우는 $427^{\circ}C$까지 급격히 떨어진 상태로 알루미늄용액이 급격히 굳어지기 시작했다. 그러나 니크롬선의 가열장치가 있는 경우에는 알루미늄 용액의 용융온도인 $660^{\circ}C$이상을 유지한 상태에서 작업을 할 수 있었으며 온도변화가 거의 없음을 알 수 있었다.