• Title/Summary/Keyword: Squeeze Casting

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Effect of Casting Processes on the Microstructures and Mechanical Properties of B390 Aluminium Alloy (주조용 B390 알루미늄합금의 조직과 기계적 성질에 대한 각종 주조법의 영향)

  • Han, Yo-Sub;Lee, Ho-In;Kim, Sung-Su;Kim, Jung-Sik
    • Journal of Korea Foundry Society
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    • v.13 no.3
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    • pp.259-267
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    • 1993
  • The effects of casting processes-direct and indirect squeeze casting, permanent mold casting and die casting on the microstructure and mechanical properties were studied for the hypereutectic B390 aluminium alloy. The effects of T5 and T6 heat treatment were also examined. The direct and indirect squeeze casting showed no casting defects such as porosity and shrinkage were observed in permanent mold castings and die castings. The primary silicon phase was refined and homogeneously distributed in the order of indirect squeeze casting, diecasting, direct squeeze casting and permanent mold casting. Depletion of primary silicon phase in die casting surface was disappeared in indirect squeeze casting. Tensile strength of cast and heat treated specimens were increased in the order of direct squeeze casting, permanent mold casting, indirect squeeze casting and die casting. Hardness of indirect squeeze castings was larger than that of other castings. As indirect squeeze casting of B390 aluminium alloy, the time of T6 heat treatment to achieve high strength can be reduced.

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A study on Defect Control of Al-12%Si Alloy by Partial Squeeze Die Casting Method (스퀴즈 병용 다이캐스팅법에 의한 Al-12%Si 합금의 결함제어에 관한 연구)

  • Kim, Ok-Soo;Kim, Yong-Hyun;Lee, Kwang-Hak;Kim, Heung-Sik
    • Journal of Korea Foundry Society
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    • v.15 no.4
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    • pp.377-387
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    • 1995
  • Partial squeeze die casting is a special die casting process which combines squeeze technique to conventional die casting. The influence of squeeze pressure $(1500-3000kg/cm^2)$ and time-lags(0.5-2.0sec) on defect control, density and microstructure of ADC12 alloy die casts has been studied by appling partial squeeze die casting to air compressure front housing production. Defect free, maximum density of $2.736kg/cm^3$ with sound microstructure of ADC12 alloy die cast has been obtained by partial squeeze die casting technique at the pressure of $2000-2500kg/cm^2$ and time-lags of 1.0-2.0sec.

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Effect of Partial Squeeze on the Quality of Casting Products in the Vacuum Die Casting (진공다이캐스팅시 국부스퀴즈 효과가 주조품질에 미치는 영향)

  • 김억수;김성준;이광학;문영훈
    • Transactions of Materials Processing
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    • v.8 no.5
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    • pp.491-497
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    • 1999
  • The effect of partial squeeze on the quality of casting products in the vacuum die casting was investigated to make defect free casting products with excellent mechanical properties. The partial squeeze and vacuum die casting process was industrially implemented in making reaction shaft support which was made of a hypereutectic Al-15%Si alloy. To combine squeezing and vacuum effects, the plunger injection system was designed and attached on the chill vent type vacuum machinery system. The combination of vacuum effect before injection and partial squeezing effect after injection resulted in defect free die casting products. The uniform distribution of fine eutectic and proeutectic Si obtained from trial process also provided excellent mechanical properties.

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Computer Analysis of Heat Transfer in Squeeze Casting (용탕단조에 있어서의 열전달 해석)

  • Yoo, Seung-Mok;Han, Yo-Sub;Lee, Ho-In;Hong, Chun-Pyo
    • Journal of Korea Foundry Society
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    • v.10 no.6
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    • pp.495-502
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    • 1990
  • A basic heat flow model has been developed to estimate the heat transfer coefficient at the casting/mold interface during squeeze casting. Based on the measured temperature profiles in squeeze casting of Al-4.5%Si alloy, heat transfer coefficients which vary with time were calculated by numerical method. The influences of the load and the amount of fraction solid on the heat transfer coefficient have also been studied. Using the calculated heat transfer coefficient two dimensional solidification analysis in the squeeze casting process was carried out by the finite difference method, and the results were in good agreement with the experiments. It may be concluded that heat flow analysis in the squeeze casting process with accurate heat transfer coefficient at the casting /mold interface is important for a proper design of cooling in die and finally for improving productivity and die life as well.

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Effects of Pressure, Superheat and Si Content on the Fluidity of Al-Si Alloy during Squeeze Casting (Al-Si 합금의 용탕 단조시 유동도에 미치는 압력, 과열 및 규소 함량의 영향)

  • Lee, Hag-Ju;Jung, Ki-Hwan;Kwon, Hae-Wook
    • Journal of Korea Foundry Society
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    • v.26 no.3
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    • pp.133-139
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    • 2006
  • The effects of applied pressure, superheat and silicon content on the fluidity of Al-Si alloy during squeeze casting were investigated. The Fluidity of Al-7.0wt%Si alloy during squeeze casting was increased with applied pressure up to 60 MPa, meanwhile it rather decreased beyond that. Therefore, the optimum squeeze casting pressure was 60 MPa. The fluidity was increased with superheat up to $150^{\circ}C$. On the other hand, it rather decreased at the superheat of $200^{\circ}C$. The fluidity of Al-Si alloy during squeeze casting was decreased with silicon content in the range of $0.0{\sim}3.0\;wt%$, increased in the range of $3.0{\sim}13.0\;wt%$. The fluidity of Al-15.0 wt%Si alloy was lower than that of Al-13.0 wt%Si alloy.

A Study on the Development for the Vehicle Engine Mountion Bracket Using Squeeze Casting (스퀴즈 캐스팅 제조법에 의한 자동차 엔진 마운틴 브래킷 개발에 관한 연구)

  • Kim, S.H.
    • Journal of Power System Engineering
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    • v.7 no.4
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    • pp.44-48
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    • 2003
  • Alumium alloys casting are gaining increased acceptance in the automotive and electronic industeries and squeeze casting is the most efficient method of manufacturing such mass produced parts. This study has been investigated the microstructures and mechanical properties of Al-7.0Si-0.4Mg(AC4C)alloy fabricated by squeeze casting process for development of Engine Mountain Bracket. The microstructure of squeeze casted specimen were composed of eutectic structure Alumimim solid solution and $Mg_2Si$ precipitates. The tensile strength of as-solid solution treatment Al-7.0Si-0.4Mg alloy revealed 2985MPa. It was found that Al-7.0Si-0.4Mg alloy have good aging hardening effect results are presented to show the validity of the control method.

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A study on the squeeze casting of Al-7.0Si-0.4Mg alloy for fuel system parts

  • Kim Soon-Ho;Kim Seong-Soo
    • International Journal of Precision Engineering and Manufacturing
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    • v.6 no.3
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    • pp.56-59
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    • 2005
  • Aluminum alloy casting is gaining increased acceptance in automotive and electronic industries and especially, squeeze casting is the most efficient method of mass manufacturing of such parts. In this study, the microstructures and mechanical properties of Al-7.0Si-0.4Mg(AC4C) alloy fabricated by squeeze casting process for development of fuel system parts (fuel rail) are investigated. The microstructure of squeeze cast specimen was composed of eutectic structure aluminum solid solution and $Mg_2Si$ precipitates. The tensile strength of as-solid solution treatment Al-7.0Si-0.4Mg alloy was 298.5MPa. It was found that Al-7.0Si-0.4Mg alloy had good corrosion resistance in electrochemical polarization test.

Microstructure and Mechanical Properties of $SiC_p/6061$ Al Composites Fabricated by Indirect Squeeze Casting (간접 용탕단조법에 의하여 제조한 $SiC_p/6061$ Al 복합재료의 조직과 기계적 성질)

  • Seo, Young-Ho;Kang, Chung-Gil
    • Journal of Korea Foundry Society
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    • v.18 no.4
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    • pp.373-382
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    • 1998
  • Particulate reinforced aluminum alloys produced by indirect squeeze casting are difficult to shape by cutting or milling. Therefore near net shape forming of complex shapes is of high economic and technical interest. The complex shape products of $SiC_p/6061$ Al composites are fabricated by the melt-stirring and indirect squeeze casting process. The mold temperatures are $200^{\circ}C$ and $300^{\circ}C$ and applied pressures are 70, 100, and 130 MPa. The volume fractions of the reinforcements are in the range of 5 vol% to 15 vol%. The reinforcement dispersion state are observed using on optical microscope. By employing observed results systematically a correlation is demonstrated among the microstructure, particles behavior, mechanical properties and processing parameters for an optimum melt-stirring(compocasting) and indirect squeeze casting process of MMCs. A procedure to establish the optimum squeeze casting of Al-MMCs is proposed.

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A Study on Microstructures and Mechanical Properties of A356/coated SiC Composites Fabricated by Squeeze Casting (Squeeze Casting법에 의해 제조된 A356/coated SiC복합재료의 미세조직과 기계적 특성에 관한 연구)

  • Lee, Kyung-Ku;Lee, Doh-Jae
    • Journal of Korea Foundry Society
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    • v.14 no.5
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    • pp.429-437
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    • 1994
  • Influence of interfacial structure between matrix and particle in A356/coated SiC composite fabricated by squeeze casting method was studied. Experimental variables are types of coated metallic film on SiC particles such as Cu, Ni-P, and applied pressure for squeeze casting. It was found that coating treatment on SiC particles improves the wetting of liquid A356 alloy on SiC particles. SiC particle distribution is very homogeneous in A356 matrix alloy which is fabricated by squeeze casting. Analysing the surface morphology of fractured A356/coated SiC, it was concluded that metallic thin film by coating treatment on SiC particle improves the interfacial bonding between particle and matrix, and so does on mechanical properties such as tensile strength. However, there was on significant difference in hardness between those composite made of as-received SiC particle and coated SiC particle.

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A Study on the Squeeze Casting of Al-7.0Si-0.4Mg Alloy for Fuel System Parts (Al-7.0Si-0.4Mg 합금 자동차 연료계 부품의 스퀴즈 캐스팅에 관한 연구)

  • 김순호
    • Journal of the Korean Society for Precision Engineering
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    • v.20 no.12
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    • pp.48-54
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    • 2003
  • Alumium alloys casting are gaining increased acceptance in the automotive and electronic industeries and squeeze casting is the most efficient method of manufacturing such mass produced parts. This study has been investigated the microstructures and mechanical properties of Al-7.0Si-0.4Mg (AC4C) alloy fabricated by squeeze casting process for development of Fuel system Parts (Fuel rail). The microstructure of squeeze casted specimen were composed of eutectic structure Alumimim solid solution and $Mg_2$Si precipitates. The tensile strength of as-solid solution treatment Al-7.0Si-0.4Mg ahoy revealed 298.5MPa. It was found that Al-7.0Si-0.4Mg alloy have good corrosion resistance in electrochemical polarization test.