• 제목/요약/키워드: Metal Foundry

검색결과 227건 처리시간 0.023초

금속기복합재료의 부품 제조공정에 관한 함침제어알고리즘 개발 및 평가 (Algorithm Development for Infiltration Control in Component Fabrication Process of Metal Matrix Composites and Their Evaluation)

  • 강충길;윤광식
    • 한국주조공학회지
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    • 제16권6호
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    • pp.523-536
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    • 1996

  • This paper relates to fabrication processing analysis of metal matrix composites by the injection of liquid metal into a fibrous preforms. One dimensional heat transfer analysis during squeeze infiltration process of aluminum base composites has been studied. An analysis method was investigated for the temperature distribution, infiltration velocity and melt infiltration characteristics with the commercial preform with short fiber array. When molten metal is infiltrated in a fibrous preform with random orientation, phase transformation will be occurred in a region such as molten metal, solidified region, preform region and infiltration composites region. a mathematical modelling for a solidification phenomena in fabrication process of metal matrix composites using a squeeze infiltration technique was investigated by the basic relations for liquid metal into a fibrous preform. The temperature distribution of theoretical results was compared with experimental data.

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알루미늄청동의 합금성분 및 냉각속도에 따른 특성변화에 관한 연구 (A Study on the Change of Properties of Al-bronze Due to Alloy Elements and Cooling Rate.)

  • 정운재;김헌주;김동옥;윤의박
    • 한국주조공학회지
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    • 제8권3호
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    • pp.271-281
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    • 1988

  • Al-bronze has a good mechanical property, corrosion resistance and castability, so being highlighted for the new copper alloy. So, effects of alloy composition and cooling rate in the mechaincal properties and solidification behavior have been investigated. The results obtained are as follows; 1) Change in volume on solidification is larger in metal mold casting than in sand mold casting. And it decreases by the addition of Al. 2) The mechanical property in metal mold casting is superior to the one in sand mold casting, and the inclination is obvious up to 9% Al, after heat-treatment ($885^{\circ}C$, $1.5hrs\;{\rightarrow}\;W\;{\cdot}\;Q\;{\rightarrow}\;540^{\circ}C$, 3hrs) 3) By adding Al, the mechanical property is slightly increased up to 9% Al, Above 9% Al, it is increased rapidly, and is accelerated by adding Fe. 4) Cooling rate and hardness, and grain size and cooling rate are related as follows in the range of $1100^{\circ}C$ to $1200^{\circ}C$ pouring temperature. Grain size(${\mu}m$)=$929.6422{\times}cooling\;rate(^{\circ}C\;/\;sec)^{-0.51537}$ Hardness(BHN)=$765.45713{\times}grain\;size({\mu}m)^{-0.31058}$.

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용탕청정기능을 부여한 고품질 다이캐스팅 기술의 개발 (Development of High Quality Die Casting Technology with Function to Purify Molten Metal)

  • 파다야지지;고목박기;도원삼차
    • 한국주조공학회지
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    • 제24권1호
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    • pp.3-9
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    • 2004

  • Die casting is "a process in which molten metal is injected at high velocity and pressure into a mold(die) cavity". Casting with smooth surfaces, high dimensional precision, complicated shapes, and reduced weight can be obtained using this process. But this process is susceptible to casting defects such as porosities, scattered chilled layers, hard spots, etc. For preventing casting defects, we developed "low-velocity high pressure die casting technology", "squeeze die casting technology", "heat insulating sleeve lubricant technology", and "direct pouring technology". The "direct pouring technology" is useful for producing molten metal without oxide contamination. It consists of a pumping system which supplies pure molten metal to the die casting machine. By using this technology, we have successfully reduced oxide contamination in castings to 1/20 of that of our previous castings.

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금형주조 구상흑연주철의 칠 형성 경향에 미치는 화학조성 및 열처리의 영향 (Effects of Alloying Elements and Heat-Treatment on the Tendency of Chill Formation of Ductile Cast Iron Produced by Metal Mold Cast)

  • 김석원;박진성;김기곤
    • 한국주조공학회지
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    • 제27권1호
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    • pp.24-30
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    • 2007

  • The effects of C, Si and RE additions on the tendency of chill formation of ductile cast iron obtained from metal mold casting were investigated. In case of metal mold cast, the ductile cast iron with 2.5%Si had pearlitic matrix, and specimens with 2.9%Si had bull's eye type regardless of C contents. As-cast specimen with a large amount of fine graphites could be obtained by adding 0.2% RE. Normalizing process was necessary to remove carbide and form a large amount of spheroidal graphites for the as-cast specimens. Good mechanical properties could be obtained by heat-treatment of as-cast specimens with pearlitic matrix. Normalizing the specimens with RE caused the reduction in mechanical properties.

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