• Title, Summary, Keyword: cold isostatic pressing

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Rubber Isostatic Pressing and Cold Isostatic Pressing of Metal Powder (금속 분말의 고무 등가압 성형과 냉간 정수압 성형)

  • Kim, Jong-Kwang;Yang, Hoon-Chul;Kim, Ki-Tae
    • Transactions of the Korean Society of Mechanical Engineers A
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    • v.27 no.7
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    • pp.1076-1086
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    • 2003
  • The effect of a rubber mould on densification behavior of aluminum alloy powder was investigated under cold isostatic compaction. A thickness of rubber mould and friction effect between die wall and rubber mould were also studied. The hyperelastic constitutive equation based on the Ogden strain energy potential was employed to analyze deformation of rubber. The elastoplastic constitutive equation of Shima and Oyane and that of Lee on densification were implemented into a finite element program (ABAQUS) to simulate densification of metal powder for cold isostatic pressing and rubber isostatic pressing. Finite element results were compared with experimental data for densification and deformation of aluminum alloy powder under isostatic compaction.

Effect of friction between metal powder and a mandrel on densification during cold isostatic pressing (냉간 정수압 성형시 금속분말과 맨드렐 사이의 마찰이 분말의 치밀화에 미치는 영향)

  • Lee, Hui-Tae;Kim, Ki-Tae
    • Transactions of the Korean Society of Mechanical Engineers A
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    • v.21 no.7
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    • pp.1116-1126
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    • 1997
  • The effects of friction between powder and a mandrel on densification behavior of metal powder were investigated under cold isostatic pressing. The elastoplastic constitutive equations based on the yield function of Shima and Oyane were implemented into finite element program (ABAQUS) to simulate compaction responses of metal powders during cold isostatic pressing. The friction coefficients between powder and mandrels with different roughness were determined by comparing experimental data and finite element results. Density distributions in the powder compacts were also studied for different friction coefficients. Finite element results were compared with experimental data for pure iron powder under cold isostatic pressing.

Effect of rubber mold on densification behavior of metal powder during cold isostatic pressing (냉간정수압 하에서 금속분말의 치밀화에 미치는 고무몰드의 영향)

  • Jeong, Jin-Won;Kim, Gi-Tae
    • Transactions of the Korean Society of Mechanical Engineers A
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    • v.22 no.2
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    • pp.330-342
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    • 1998
  • The effect of rubber mold on densification behavior of pure iron powder was investigated under cold isostatic pressing. The thickness effect of rubber mold was also studied. The elastoplastic constitutive equation based on the yield function of Shima and Oyane was implemented into the finite element program(ABAQUS) to predict compaction responses of metal powder under cold isostatic pressing. The hyperelastic constitutive equation based on Moony-Rivlin and Ogden strain energy potentials was also employed to analyze deformation of rubber mold. The coefficients of the strain energy potentials were obtained from tension and volumetric compression data of rubber. Finite element results were compared with experimental data for densification of pure iron powder under cold isostatic pressing.

Effect of Ceramic Ball Inclusion on Densification of Metal Powder Compact (삽입된 세라믹 볼이 금속분말성형체의 치밀화에 미치는 영향)

  • Park, Hwan;Yu, Yo-Han;Kim, Gi-Tae
    • Transactions of the Korean Society of Mechanical Engineers A
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    • v.24 no.1
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    • pp.29-37
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    • 2000
  • The effect of a ceramic ball inclusion on densification behavior of a metal powder compact was investigated under cold isostatic pressing, pressureless sintering and hot isostatic pressing. To simulate those processes, proper constitutive models were implemented into a finite element program (ABAQUS). Measured density distributions of metal powder compacts were also compared with finite element results and showed the same trend with simulated results. Residual stress distributions were calculated by finite element analysis to study the effect of ceramic ball inclusions with different thermal expansion coefficients. The higher residual stress was observed in a metal powder compact when the difference between thermal expansion coefficients for a ceramic ball and metal powder became larger. Samples produced by Wing showed more uniform density distributions and lower residual stresses compared to those by sintering after cold isostatic pressing. For various sizes of ceramic ball inclusions, densification and deformation of powder compacts were also studied during hot isostatic pressing.

Near-Net-Shape Forming and Finite Element Analysis for Ceramic Powder Under Cold Combination Pressing and Pressureless Sintering (냉간 조합압축과 상압소결에 의한 세라믹 분말의 정밀정형과 유한요소해석)

  • Kim, Hong-Gi;Lee, Hyeong-Man;Kim, Gi-Tae
    • Transactions of the Korean Society of Mechanical Engineers A
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    • v.24 no.2
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    • pp.526-534
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    • 2000
  • Near-net-shape forming of zirconia powder was investigated under the combination of cold die and isostatic pressing and pressureless sintering. A novel combination pressing technique, i.e., die com paction under cold isostatic pressing, allowed to produce a complex shaped ceramic powder compact with the controlled dimensions and relatively uniform density distributions. The constitutive models proposed by Kim and co-workers for densification of ceramic powder under cold compaction and high temperature were implemented into a finite element program (ABAQUS). Experimental data for relative density distributions and deformations of zirconia powder compacts produced by cold combination pressing and pressureless sintering were compared with finite element results. Finite element results agreed well with experimental data.

Densification Behavior of Metal Powder under Cold Compaction (냉간 압축 하에서 금속 분말의 치밀화 거동)

  • Lee, Sung-Chul;Kim, Ki-Tae
    • Proceedings of the KSME Conference
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    • pp.652-657
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    • 2001
  • Densification behavior of aluminum alloy(A16061) powder was investigated under cold compaction. Experimental data were obtained under triaxial compression with various loading conditions. A special form of the Cap model was proposed from experimental data of A16061 powder under triaxial compression. The proposed yield function and several yield functions in the literature were implemented into a finite element program (ABAQUS) to compare with experimental data for densification behavior of A16061 powder under cold isostatic pressing and die compaction. The agreement between finite element calculations from the proposed yield function and experimental data is very good under cold isostatic pressing and die compaction.

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Densification Behavior of Metal Powder Under Cold Compaction (냉간 압축 하에서 금속 분말의 치밀화 거동)

  • Lee, Seong-Cheol;Kim, Gi-Tae
    • Transactions of the Korean Society of Mechanical Engineers A
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    • v.26 no.1
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    • pp.95-104
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    • 2002
  • Densification behavior of aluminum alloy(A16061) powder was investigated under cold compaction. Experimental data were obtained under triaxial compression with various loading conditions. A special form of the Cap model was proposed from experimental data of A16061 powder under triaxial compression. The proposed yield function and several yield functions in the literature were implemented into a finite element program (ABAQUS) to compare with experimental data for densifcation behavior of A16061 powder under cold isostatic pressing and die compaction. The agreement between finite element calculations from the proposed yield function and experimental data is very good under cold isostatic pressing and die compaction.

Application of cold isostatic pressing method for fabrication of SoG-Si powder compacts (태양전지급 폴리실리콘 성형체 제작을 위한 CIP법의 활용)

  • Lee, Ho-Moon;Shin, Je-Sik;Moon, Byung-Moon;Kwon, Ki-Hwan;Kim, Ki-Young
    • 한국신재생에너지학회:학술대회논문집
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    • pp.126-129
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    • 2009
  • In this study, it was aimed to develop the re-use technology of ultra-fine silicon powders, by-products during the current production process of high purity poly-Si feedstock. For this goal, the compacts of the silicon powders were tried to fabricate by CIP (Cold Isostatic Pressing) method using silicon rubber mold without chemical binder materials. The density ratio of the silicon powder compacts reached 74%. In order to simulate the actual handling and charging conditions of feedstock material in casting process, a shaking test was carried out and mass loss measured. Finally, the silicon powder compacts were melted using a cold crucible induction melting method and the purity assessment was conducted by Hall effect measurement.

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A Densification Model for Mixed Metal Powder under Cold Coompaction (냉간압축하에서 혼합금속분말의 치밀화 모델)

  • 조진호
    • Proceedings of the Korean Society for Technology of Plasticity Conference
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    • pp.112-118
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    • 2000
  • Densification behavior of mixed copper and tool steel powder under cold compaction was investigated. By mixing the yield functions proposed by Fleck et al. and by Gurson for pure powder in terms of volume fractions and contact numbers of Cu powder new mixed yield functions were employed for densification of powder composites under cold compaction. The constitutive equations were implemented into a finite element program (ABAQUS) to compare with experimental data for densificatiojn of mixed powder under cold isostatic pressing and cold die compaction. finite element calculations by using the yield functions mixed by contact numbers of Cu powder agreed better with experimental data than those by volume fractions of Cu powder.

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Densification Behavior of Aluminum Alloy Powder Mixed with Zirconia Powder Inclusion Under Cold Compaction (냉간압축 하에서 지르코니아 분말이 혼합된 알루미늄합금 분말의 치밀화 거동)

  • Ryu, Hyun-Seok;Lee, Sung-Chul;Kim, Ki-Tae
    • Transactions of the Korean Society of Mechanical Engineers A
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    • v.26 no.7
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    • pp.1324-1331
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    • 2002
  • Densification behavior of composite powders was investigated during cold compaction. Experimental data were obtained for aluminum alloy powder mixed with zirconia powder inclusion under triaxial compression. The Cap model with constraint factors was implemented into a finite element program (ABAQUS) to simulate compaction responses of composite powders during cold compaction. Finite element results were compared with experimental data for densification behavior of composite powders under cold isostatic pressing and die compaction. The agreements between experimental data and finite element calculations from the Cap model with constraint factors were good.