• Title/Summary/Keyword: Strip Die-casting

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A Study on the Characteristics of Cast Bonding Aluminium Alloy and Fe-17wt%Cr Steel with Vacuum Die Casting (진공다이캐스트법에 의한 Al합금과 Fe-17wt%Cr 강의 주조접합 특성연구)

  • Kim, Yong-Hyun;Kim, Eok-Soo;Kim, Heung-Sik;Lee, Kwang-Hak
    • Journal of Korea Foundry Society
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    • v.19 no.5
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    • pp.410-418
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    • 1999
  • To overcome the undesirable deformation, peeling off and geometrical restrictions which were mainly caused by differences in thermal expansion coefficients during the cladding of aluminum strip and stainless strip, new processing method based on vacuum die casting is designed and implemented in fabricating Fe-17wt%Cr steel (stainless steel). To increase cast-bonding ability, the surface of Fe-17wt%Cr steel is electrochemical etched to have optimum pit size (above 0.2 mm) and pit density (above 30%). The implementation of vacuum die casting by using surface treated stainless steel (Fe-17wt%Cr Steel) produces good trial products having acceptable cast-bonding ability. The enabling conditions for cast-bonding are pouring temperature $690^{\circ}C$, filling speed 30 m/sec and casting pressure $800\;kg/cm^2$. The microscopic observation of cast-bonded Al/Fe-17wt%Cr steel does not show any evidence of intermetallic compounds. The bonding strength of trial products is $150-400\;kg/cm^2$ and this is stronger than conventionally cladded metal having $30-70\;kg/cm^2$.

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A Study on the Surface Characterization of Fe-17wt.%Cr Steel for Cast-bonding of Al and Stainless Steel (Al과 스텐레스강의 주조접합을 위한 STS430(Fe-17wt.%Cr)강의 표면처리 특성연구)

  • Kim, Eok-Soo
    • Journal of Korea Foundry Society
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    • v.25 no.3
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    • pp.134-141
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    • 2005
  • To overcome the undesirable deformation, peeling off and geometrical restrictions which were mainly caused by differences in thermal expansion coefficients during the cladding of aluminum strip and stainless strip, new processing method based on vacuum die casting is designed and implemented in fabricating Al/Fe-17wt%Cr steel(stainless steel). To increase cast-bonding ability, the surface of Fe-17wt%Cr steel is electrochemically etched to have optimum pit size and density. The optimum conditions to generate best pit are as follows: Solution: 1 M $Fecl_{3}$+1 M Nacl, Addition: $CuCl_{2}+HCl$, Current density: 80 $mA/cm^{2}$, Total current: 400 $coulomb/cm^{2}$, AC frequency :60 Hz.

Axial Pressing Method Using Pulse Magnetizing Field for the Preparation of Nd-Ee-B Sintered Magnets (펄스자장을 이용한 고이방화 Nd-Fe-B자석의 종축자장성형방법)

  • Kim, Dong-Hwan;Kang, Byung-Kil;Jang, Dong-Youl;Kim, Andrew S.;Kim, Sang-Myun;Jang, T.S.
    • Journal of the Korean Magnetics Society
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    • v.13 no.4
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    • pp.182-186
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    • 2003
  • A new axial pressing method using pulse magnetizing field was studied to improve the remanence of Nd-Fe-B sintered magnets. In order to make near-net shape green compacts of butterfly, disk, or coin magnets, conventional axial-type pressing has been normally used. However, compared to the transverse-type pressing, it is not possible to obtain higher remanence by this method because the magnetic alignment of powder begins to deteriorate when the density of green compacts increases over a critical value. On the other hand, we found that an axial pressing under pulse magnetizing field was very effective to increase the degree of magnetic alignment of powder, yielding remanences even higher than those obtained by the transverse pressing. In this study, it was revealed that appropriate tapping density and how to apply pulse magnetic held were important to improve the grain alignment and thus remanence of Nd-Fe-B sintered magnet.