• Journal of the Korea Institute of Information and Communication Engineering
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• v.20 no.8
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• pp.1546-1552
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• 2016

In addition, because it uses preheating to dissolve an alloy in general, it is hard to regulate the appropriate melting temperature of the alloy and brewing time and shows the defect of the supplementation thing due to the super-heating. Once the alloy is molten and then most of the casting by attaching a sight glass or non-contact temperature sensor is suitable casting temperature the operator pressing a button to generate a centrifugal force to inject the molten alloy into a crucible in the casting ring. These results, and most of the cast temperature is too high or too low to generate a lot of casting defects do not get into a uniform cast body. In this paper, we developed a dental casting machine for high frequency using a single temperature sensor which can measure the actual temperature of the alloy than the temperature of the external non-contact measurement using a temperature sensor.

• Journal of Korea Foundry Society
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• v.43 no.2
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• pp.95-101
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• 2023

• Journal of the Korean Society of Fisheries and Ocean Technology
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• v.17 no.2
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• pp.85-91
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• 1981

An equation was derived which describes the slip force that occurs at the casting of initial state due to unequilibrium with support bar weight, liquid metal, casting velocity, thickness, control roller, hydraulic motor and etc. The slip force equations are solved on the basis of velocity, gravity and thickness in casting ingot. In this paper the auther assumed that the other mechanisms are normal. The behaviour of slip force in many characteristics is calculated as a function of velocity, gravity and thickness with variation. The conclusion with this phenomena is reached that the present theory realistically predicts the growth of slip force in a flat plate ingot continuous casting machine.

• Journal of Korea Foundry Society
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• v.2 no.1
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• pp.27-34
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• 1982

• Journal of Korea Foundry Society
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• v.13 no.1
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• pp.17-24
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• 1993

• Journal of Korea Foundry Society
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• v.6 no.1
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• pp.63-67
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• 1986

• Journal of Korea Foundry Society
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• v.43 no.6
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• pp.313-318
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• 2023

• Proceedings of the Materials Research Society of Korea Conference
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• 2011.05a
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• pp.55.1-55.1
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• 2011

의료용 고속 에어터빈 핸드피스는 주로 치과에서 치아 절삭 및 치료에 사용하는 도구로써 치의학 분야에서 가장 폭넓게 사용되는 의료장비 중 하나이다. 핸드피스용 소재는 황동 혹은 스테인레스 강이 주로 사용되었으나, 최근 고내식성, 인체친화성이 높은 티타늄을 사용한 가벼운 재질의 핸드피스 제품들이 개발되어 독일 및 일본을 중심으로 출시되고 있다. 티타늄으로 제조되는 부분은 헤드와 바디로써, 본 연구에서는 에어터빈의 케이스에 해당하는 헤드부 제조에 있어서 정밀주조 공정 적용의 타당성을 조사하였다. 티타늄은 특히 용융점이 높고 유동성이 좋지 않을 뿐만 아니라 주형과의 반응성이 높기 때문에 주조 시 제품 내/외 부에 결함발생 빈도가 높다. 이와 같은 주조결함 제어를 위하여 상용 유한요소 프로그램인 ProCASTTM을 사용하여 핸드피스 헤드 제조 시 유동 및 응고해석을 수행하였다. 또한 헤드 부 형상에 따른 주조성을 조사하여 이를 바탕으로 최적 주조방안 도출을 위한 정밀주조 공정해석 연구를 수행하였다.

• Journal of Biomedical Engineering Research
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• v.24 no.5
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• pp.375-380
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• 2003

In this study. we have intended to control the properties of surface reaction zone generated between pure titanium and oxide investment moulds. Commercially pure titanium was centrifugally casted and silica$.$alumina based phosphate bonded investment was used as the mould material. The effect of cooling methods after casting on the surface reaction zone and mechanical properties of casts were investigated. The resulting casts showed the multilayered surface reaction zone regardless of cooling method. Especially. water cooling method produced the titanium casts with thinner surface reaction zone. weaker strength. and higher elongation properties compared to air cooling. It can thus be known that the resulting casts had satisfactory mechanical properties as dental materials. From these results, the cooling rate dependence of interfacial and mechanical properties can be attributed to the diffusion of oxygen from casting environment, which control the reaction of titanium and mould.

• Journal of Korea Foundry Society
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• v.18 no.4
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• pp.334-339
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• 1998