• Title/Summary/Keyword: Casting Speed

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Mechanical Properties of 7000 Series Aluminium Alloys with Scandium Addition (스칸듐을 첨가한 7000 계열 알루미늄 합금의 기계적 특성)

  • Lee, Kyong-Hwan;Cho, Soo-Youn
    • Journal of Korea Foundry Society
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    • v.32 no.4
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    • pp.181-189
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    • 2012
  • The microstructures of self-designed 7000 series Aluminium alloys added with Sc are observed. Moreover, the mechanical properties of the Sc-added Aluminium alloys are evaluated as a function of tensile temperature to establish the conditions of a following extrusion process. New casting conditions in the aluminium alloys added with Sc could be established by changing the casting speed and stirring time in the existing casting conditions of Aluminium alloys. The Sc addition results in $Al_3(Sc,Zr)$ precipitates in the cast alloys, and leads to the formation of equal-axed grains and fine grains. After homogenization heat treatment at $450^{\circ}C$, the Sc-added Aluminium alloys showed the highest elongation values in the temperature ranging from $300{\sim}400^{\circ}C$.

Thermal Behavior Analysis in Continuous Bloom Casting Mold (Bloom용 연속주조 몰드의 열거동 해석)

  • 정영진;김성훈;김영모;강충길
    • Transactions of Materials Processing
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    • v.13 no.4
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    • pp.319-325
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    • 2004
  • Continuous casting machine has been experienced a rapid development to increase productivity with high casting speed and to meet consumer's strict demands for high quality. However, because most of defects and cracks are initially formed in mold and grown into surface cracks during the post process, more specific and clear investigations upon heat transfer mechanism between mold and solidified shell are necessarily needed. In this study heat transfer coefficients which shows the characteristic of heat transfer mechanism are calculated with temperatures measured in bloom mold using optimal algorithm, and thermal analysis are investigated using the calculated heat transfer coefficients. Finally uniformity of solidified shell is investigated for high carbon steel, 0.187%C from thermal analysis.

A Study on Infiltration Limits in Forming Process of Metal Matrix Composites by Squeeze Casting (용탕단조법에 의한 금속복합재료의 성형공정에 있어서 함침한계성에 관한 연구)

  • Kang, C.C.;Ku, G.S.
    • Transactions of the Korean Society of Mechanical Engineers
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    • v.17 no.7 s.94
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    • pp.1751-1760
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    • 1993
  • The squeeze casting process is considered as an attractive way to form the primary product of near net shape metal matrix composites for wide use in automobile industry. To understand for infiltration limit in squeeze casting processes, the SAFFIL short fiber preform of volume fraction $10%{\sim}23%$ were fabricated by vaccum pumping and speed control press, and the optimal condition for fiber preform fabrication had been experimentally obtained. The composite materials were fabricated by forced infiltration of molten metals such as Al6061, Al7075, pure Al, AC8A, and Al2024. The infiltration distance and deformation of fiber preform are observed, and tensile strength were measured from at the room temperature.

A Study on Manufacturing Process of Hypereutectic Al-Si Alloy via Horizontal Continuous Casting (수평연속주조에 의한 과공정 Al-Si합금 제조에 관한 연구)

  • You, Bong-Sun;Ji, Mu-Sung;Park, Won-Wook
    • Journal of Korea Foundry Society
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    • v.16 no.2
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    • pp.116-123
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    • 1996
  • The equipment for the horizontal continuous casting was built to produce hyper-eutectic Al-Si bars with a small cross-section of 25mm in diameter. The manufacturing processes including withdrawal cycle and secondary cooling methods were modified to refine the primary and the eutectic Si. The longitudinal casting speeds varied over the ranges of 670-1100mm/min for pure Al, and 200-350mm/min for Al-17wt%Si alloy. Due to the difference of cooling rate in the mould, microstructural asymmetry between the lower and the upper part of bar was observed. Thus, manufacturing processes such as cooling and withdrawal method were optimally combinated to get the homogeneous cast structure. With the increase of casting speed, the primary Si size was refined down to $30{\mu}m$ near the surface, and $80{\mu}m$ in the center of the bar.

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Unidirectionally Solidified Cu Rod Fabrication Using Continuous Casting Apparatus with Cooled Mold (냉각주형식 연속주조장치에 의한 일방향응고 Cu 선재의 제조)

  • Cho, Hoon;Cho, In-Sung
    • Journal of Korea Foundry Society
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    • v.29 no.5
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    • pp.198-203
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    • 2009
  • In order to manufacture copper ultra fine wire used for bonding wire in integrated circuit package, continuous casting process, which can produce high purity copper rod with small cross section, and wiredrawing process have to be optimized to prevent wire brakeage during entire manufacturing process of fine wire. The optimum condition for producing copper rod with mirror surface has to established by investigation of the effects of several parameters such as withdrawal speed, superheat and rod diameter on grain morphology of the cast rod and on its drawing characteristics to fine wire. The purpose of this study is to propose the optimized process parameters in continuous casting process in order to produce cast rod without internal defects, and to predict microstructure orientation suitable for wire drawing process.

Microstructures and Mechanical Properties of Al-Ni Eutectic Composite by Upward Continuous Casting (상향식 연속주조법으로 제조한 Ai-Ni 공정복합재료의 응고조직 및 기계적 성질)

  • Kwon, Kee-Kyun;Hong, Chun-Pyo;Lee, Kye-Wan
    • Journal of Korea Foundry Society
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    • v.10 no.1
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    • pp.50-56
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    • 1990
  • Continuous casting of the $Al-Al_3Ni$: eutectic composite was carried out by the upward continuous casting process. The morphology of the eutectic growth and the stability of solid-liquid interface were investigated under various growth conditions in an upward continuous casting. The effect of growth conditions on the mechanical properties of the $Al-Al_3$ Ni eutectic composit was also investigated, and the results were compared with those by the Bridgman method. As for the results, it was possible to get the planar solid-liquid interface at the condition of $G_L/R$$1.04{\times}10^3^{\circ}Csec/mm^2$. And the inter-rod spacing of $Al-Al_3Ni$ eutectic composite was decreased with the increase of pulling speed. The reduction of inter-rod spacing & value of $G_L/R$ caused the increase of ultimate tensile strength in $Al-Al_3Ni$: eutectic composite. The ultimate tensile strengths of $Al-Al_3Ni$ by the upward continuous casting were higher then those by the Bridgman method.

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Vacuum Die Casting Mold Design of Fuel Cell Bipolar Plate using Die Filling Simulation and Experimental Verification (금형 충전 해석을 이용한 연료전지 분리판 진공 다이캐스팅 금형 설계 방안 및 실험 검증)

  • Jin, Chul-Kyu;Jang, Chang-Hyun;Kang, Chung-Gil
    • Journal of Korea Foundry Society
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    • v.32 no.2
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    • pp.65-74
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    • 2012
  • In this paper, we present the results of our studies on optimal die design towards development of a vacuum die casting process to fabricate fuel cell bipolar plate with micro-channel array. Cavity and overflow shape is designed by computational filling analysis of MAGMA soft. Optimal die design consists of seven overflows at the end of cavity and three overflows at each side wall of cavity. The molten metal that passed the gate and reached the side wall flowed into the side overflow, no turbulent flow occurred, and the filling behavior and velocity distribution were uniform. In addition, partially solidified molten metal passing through the channel was perfectly eliminated by overflow without back-flow. When vacuum pressure, injection speed of low and high region was 300 mbar, 0.3 m/s and 2.5 m/s respectively with Silafont 36 die casting alloy, sound sample without casting defects was obtained. The experimental results are nearly consistent with simulation results.

A Study on the Occurrence of the Striation Defect during the Continuous Casting with the Heated Mold (가열주형 연속주조시 발생되는 줄무늬 결함에 관한 연구)

  • An, Ki-Sung;Song, Tae-Seck;Ji, Tae-Gu;Jo, Hyung-Ho;Kim, Myung-Han
    • Journal of Korea Foundry Society
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    • v.17 no.2
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    • pp.145-150
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    • 1997
  • The striations parallel to the casting direction are the characteristic defects occurring during the unidirectional solidification of nonferrous metals such as pure Al and Sn. It has been known that the defects affect the recrystallization temperature as well as the mechanical and electrical properties of Al. However, it has not been still known about the effect of casting factors such as the casting speed, rod diameter of cast metals, and alloying elements on the occurrence of striations. In the present study, these casting factors affecting the occurrence of striation were investigated by adopting the quantitative examination of striations. Also, the relation between striation defects and feathery grain, which are very similar to the striation defects, was studied.

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A Deformation Behavior Analysis of Dynamic Bulging in the Mini-Mill Continuous Casting System (Mini-Mill 연속주고기의 동적 Bulging해석 Model(I) -주편의 변형거동을 중심으로-)

  • 한성욱;정영진;강충길
    • Proceedings of the Korean Society for Technology of Plasticity Conference
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    • 1998.03a
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    • pp.138-143
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    • 1998
  • The continuous casting process has been adopted increasingly in recent years to save both energy and labor. It has experienced a rapid development in the production of semi-finished steel products, replacing the conventional route of ingot casting plus rolling. To achieve this good merit, however, more studies about a heat transfer mechanism between roll and slab are needed. So this paper shows the results of the deformation behavior of steel cast slabs, which are about the solidification and heat transfer. This study is used to prevent internal cracks of a slab in a bending and unbending zone. The value of moving strand shell bulging between two supporting rollers under ferrostatic pressure and slab-self weight has been computed in terms of creep and elastic-plasticity. The high strand distributions in solidified shell undergoes a series of bulging are calculated with boundary condition a very closed to continuous steel cast slabs productions.

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