• Title/Summary/Keyword: 구상흑연 주철

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Comparative Test of the End Fitting Materials of Polymer Insulators (폴리머 애자의 금구재질에 따른 비교 시험)

  • Hwang, K.;Park, Y.C.;Lee, S.K.;Oh, Y.W.;Jung, S.Y.;Kim, B.K.
    • Proceedings of the KIEE Conference
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    • 2001.11a
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    • pp.93-95
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    • 2001

  • 현재 폴리머 애자의 금구 재질로 사용되고 있는 구상 흑연 주철품(FCD450). 기계 구조용 탄소강(SM20C) 및 알루미늄 합금(A2024)의 압착에 따른 인장파괴하중의 값과 재질고유의 인장시험 등을 통하여 가장 우수한 특성을 보이는 재질을 선정하고자 하였다. 본 실험 결과 기계구조용 탄소강(SM20C)이 압착조건에서는 기계적 특성에서 우수한 재질로 판정이 되었으며, Qs(품질관리지수)를 계산한 결과도 만족한 값을 보였다. 향후 전철용 고분자 장간애자에서는 구상 흑연 주철품(FCD450)으로만 규정되어 있는 금구 재질을 동등 이상의 재질로 규정하는 것이 특성향상에 바람직할 것으로 보여진다.

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Effect of Cu on the mechanical Properties and damping capacity of austempered ductile cast iron (오스템퍼링 처리한 구상흑연주철의 기계적 성질 및 감쇠능에 미치는 Cu의 영향)

  • Lee, K.H.;Kang, C.Y.
    • Journal of Power System Engineering
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    • v.12 no.3
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    • pp.72-77
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    • 2008

  • This study was investigated to know the effect of Cu addition on austempered ductile cast iron at various temperatures and times. Test results showed that the volume fraction of retained austenite and the carbon contents of retained austenite showed the greatest value at $400^{\circ}C$. Also, in case of specimens having more Cu contents, the volume fraction of retained austenite and the carbon contents of retained austenite showed the lower value. After austempering treatment, tensile strength and Impact value increased, but elongation decreased. With increasing austempering treatment temperature, tensile strength, elongation, and impact value decreased. In case of specimen having more Cu contents, tensile strength showed the higher value, but elongation showed the lower value. Damping capacity was decreased by austempering treatment and was not affected on austempering temperature and time. In case of specimen having more Cu contents, damping capacity showed the higher value.

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A Study on the Mechanical Properties and Fatigue Limit of the Austenitizing Treatment Conditions in Austempered Ductile Iron (오스템퍼링처리한 구상흑연주철의 오스테나이트화 조건에 따른 기계적 성질 및 피로한도에 관한 연구)

  • Kim, Min-Gun;Lim, Bok-Kyu
    • Journal of Industrial Technology
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    • v.24 no.A
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    • pp.3-8
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    • 2004

  • This study was performed to investigate the effect of two step austenitized treatment on the mechanical properties and fracture characteristic of the ductile cast iron and austempered ductile cast iron(ADI). The obtained results of this study were as follows. The matrix structures of specimens were changed differently by austenitizing heat treatment. Microstructure of austempered ductile cast iron obtained by two step austenitized treatment was bainitic ferrite and retained austenite. With two step austenitized treatment, vield strength, tensile strength and hardness decreased, while the elongation increased.

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The Study on Interrupted Cutting Tool Life of Cermet and CBN in Ductile Cast Iron(FCD500) (구상흑연주철(FCD500)의 단속가공에서 서멧과 CBN의 공구수명에 관한 연구)

  • Oh, Sung-Hoon
    • Journal of the Korean Society of Manufacturing Process Engineers
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    • v.11 no.5
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    • pp.8-12
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    • 2012

  • Recently, a wide range of industrial production area has a competitive advantage through cost reduction. Moreover with the development of industrial technology, base material and cutting tool help the machining technology. But most of the machining enterprises have not hold the R&D facilities and human resources. This mainly disturbs the industrial development and th increase of production efficiency. Especially in the interrupted machining process, it showed different behavior with continuous machining process. So it needs to research and develop the tool life and tool wear mechanism analysis.

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