• 제목/요약/키워드: 정밀주조

검색결과 132건 처리시간 0.025초

쾌속조형기를 이용한 정밀주조물의 쾌속제작에 관한 연구 (Study on the Rapid Manufacturing for Investment Casting)

  • 주영철;김태완
    • 한국산학기술학회논문지
    • /
    • 제3권2호
    • /
    • pp.136-140
    • /
    • 2002
  • 정밀하고 복잡한 형상의 금속 부품을 제작하는데 사용되는 정밀주조법은 왁스형을 만드는 과정을 수작업으로 진행하므로 많은 시간과 비용이 소요되었다. 왁스형 제작공정을 개선하기 위해 쾌속조형기를 이용하는 방법을 제안하였다. SLS 형 쾌속조형기를 이용하여 캐스트폼형을 제작하고 여기에 용융된 왁스를 함침시켜 왁스형을 완성한다. 이 방법을 이용하여 스텐레스 스틸 소재의 금속 주분을 제작하였는데, 시간과 비용이 크게 절감되었으며 정밀도도 향상되었다.

  • PDF

R/P 마스터 모델을 활용한 정밀주조 부품 및 쾌속금형 제작 공정기술의 개발 (Development of Rapid Tooling using Investment Casting & R/P Master Model)

  • 정해도;김화영
    • 한국주조공학회지
    • /
    • 제20권5호
    • /
    • pp.330-335
    • /
    • 2000
  • Functional metal prototypes are often required in numerous industrial applications. These components are typically needed in the early stage of a project to determine form, fit and function. Recent R/P(Rapid Prototyping) part are made of soft materials such as plastics, wax, paper, these master models cannot be employed durable test in real harsh working environment. Parts by direct metal rapid tooling method, such as laser sintering, by now are hard to get net shape, pores of the green parts of powder casting method must be infiltrated to get proper strength as tool, and new type of 3D direct tooling system combining fabrication welding arc and cutting process is reported. But a system which can build directly 3D parts of high performance functional material as metal park would get long period of system development, massive investment and other serious obstacles, such as patent. In this paper, through the rapid tooling process as silicon rubber molding using R/P master model, and fabricate wax pattern in that silicon rubber mold using vacuum casting method, then we translated the wax patterns to numerous metal tool prototypes by new investment casting process combined conventional investment casting with rapid prototyping & rapid tooling process. With this wax-injection-mold-free investment casting, we developed new investment casting process of fabricating numerous functional metal prototypes from one master model, combined 3-D CAD, R/P and conventional investment casting and tried to expect net shape measuring total dimension shrinkage from R/P pare to metal part.

  • PDF

Ti기 (TiC+TiB) 하이브리드 복합재료 반응생성합성 및 정밀주조 (In-situ Synthesis and Investment Casting of Titanium Matrix (TiC+TiB) Hybrid Composites)

  • 성시영;박근창;이상화;김영직
    • 한국주조공학회지
    • /
    • 제24권3호
    • /
    • pp.159-164
    • /
    • 2004
  • The aim of the present work is to investigate the possibility of in-situ synthesis and net-shape forming of the titanium matrix (TiC+TiB) hybrid composites using a casting route. From the scanning electron microscopy, electron probe micro-analyzer, X-ray diffraction and thermodynamic calculations, the spherical TiC and needle like TiB reinforced hybrid titanium matrix composites could be obtained in-situ by the conventional melting and casting route between titanium and $B_4C$. No melt-mold reaction occurred between the titanium matrix (TiC+TiB) hybrid composites and the SKK mold, since the mold is consisted with interstitial and substitutional metal-mold reaction products. Not only the sound in-situ synthesis but also the economic net-shape forming of the titanium matrix (TiC+TiB) hybrid composites could be possible by the conventional casting route.

A356합금을 이용한 정밀주조 Turbo Charger Wheel의 기계적 특성에 미치는 열처리의 영향 (Effect of Heat Treatment on the Mechanical Properties of Investment Casting Turbo Charger Wheel using A356 Alloy)

  • 김상미;우기도;김지영;김상혁;박상훈;강황진;박찬성
    • 한국주조공학회지
    • /
    • 제31권5호
    • /
    • pp.262-266
    • /
    • 2011
  • The aim of this study is to investigate aging behavior of A356 alloy for turbo charger part. The specimen was fabricated by investment casting. Solution heat treatment was performed at $525^{\circ}C$ for 8h and followed by aging treated at $160^{\circ}C$, $170^{\circ}C$ for 0.5~20h. And their microstructures and mechanical properties of the aged specimens were analyzed by scanning electron microscope and hardness tester, respectively. All the cast A356 alloy included eutectic Si particles. In the cast A356 alloy, eutectic Si phase mainly was formed along Chinese script phase. Vickers hardness of the cast was improved by aging treatment due to formation of ${\beta}$" phase and ${\beta}$' phase.

TiAl 합금의 CaO 도가니 유도용융 및 정밀주조 (CaO Crucible Induction Melting and Investment Casting of TiAl Alloys)

  • 김명균;성시영;김영직
    • 한국주조공학회지
    • /
    • 제22권2호
    • /
    • pp.75-81
    • /
    • 2002
  • The main objectives were to investigate the suitability of CaO crucible for melting TiAl alloys and to develop investment mold for investment casting of TiAl alloys. TiAl alloy specimen were prepared by plasma arc furnace under argon atmosphere. After melting of TiAl alloy using CaO crucible, the results showed that there is little contamination of oxygen in the TiAl bulk. Conventional vacuum induction furnaces can be readily adaptable to produce cast parts of TiAl without high skilled techniques. The determination of optical metallography and microhardness profiles in investment cast TiAl alloy rods has allowed the gradation of the relative thermal stability of the oxides examined. The molds used for the present study were $ZrO_2$, $Al_2O_3$, CaO stabilized $ZrO_2$ and $ZrSiO_4$. Even although high temperature of mold preheating, $Al_2O_3$ mold is a promising mold material for investment casting of TiAl alloys in terms of thermal stability, cost and handling strength. It is important to take thermal stability and preheating temperature of mold into consideration for investment casting of TiAl alloys.

CE형 원전연료 부품의 국산 시제품에 대한 구조강도 및 특성시험

  • 송기남;서정민
    • 한국원자력학회:학술대회논문집
    • /
    • 한국원자력학회 1996년도 춘계학술발표회논문집(3)
    • /
    • pp.33-38
    • /
    • 1996
  • 영광 3,4호기용 원전연료에 사용되는 구조용 부품들 중에서 coil형 Holddown spring을 포함한 Upper end fitting assembly, Lower end fitting 등을 국내에서 제조할 수 있는 제조공정이 대우 정밀(주)에서 개발되었다. 이 공정에서 제조한 시제품들에 대하여 기계/구조적인 설계 관점에서 요구되는 제 조건들의 만족 여부를 구조강도 및 특성시험을 통하여 검증하였다. 검증시험 결과 주조제품인 Holddown plate 및 Lower end fitting은 주조물에서 요구되는 제기준과 기계/구조적인 설계 관건에서의 구조적 강도요건을 만족하고 있었고 coil형 Holddown spring의 특성이 설계 요구범위내에 있음이 확인됨으로서 향후 생산될 원전연료에는 금번에 개발된 공정으로 제조될 부품들이 사용필 수 있으리라 전망된다.

  • PDF

산업부문 B2B 시범사업 소개 - 금형업종 -

  • 류병우
    • 한국전자거래학회:학술대회논문집
    • /
    • 한국전자거래학회 2001년도 International Conference CALS/EC KOREA
    • /
    • pp.105-109
    • /
    • 2001
  • 성형의 종류 ◈금속 성형 ㆍ 스탬핑(Stamping) ㆍ 정밀 블랭킹(Fine Blanking) ㆍ 딥 드로잉(Deep Drawing) ㆍ 다이캐스팅(Die Casting) ㆍ 인베스트먼트 주조(Investment Casting) ㆍ 분말 야금(Power Metallurgy) ㆍ 인발(Wire Drawing) ㆍ 압출(Extrusion) ㆍ 단조(Forging) ㆍ ㆍ코이닝(Coining) ㆍ... ◈비금속 성형 ㆍ 사출(Injection) ㆍ 압축(Compression) ㆍ 블로우 성형(Blow Molding) ㆍ 진공 성형(Vacuum Molding) ㆍ 발포 성형(Foam Molding) ㆍ 피복(Encapsulation) ㆍ 회전식(Rotational) ㆍ 주조(Casting) ㆍ 적층(Laminating) ㆍ 압출(Extrusion) ㆍ...(중략)

  • PDF

AC2A 합금의 양극 산화 피막 형성에 미치는 석출물의 영향 (Effect of second-phase particles on the formation of anodic oxide films on AC2A alloy)

  • 남윤경;문성모;김종화
    • 한국표면공학회:학술대회논문집
    • /
    • 한국표면공학회 2009년도 추계학술대회 초록집
    • /
    • pp.205-206
    • /
    • 2009
  • 다량의 석출물을 포함하고 있는 AC2A 합금을 $0^{\circ}C$에서 2.25M H2SO4에서 양극산화처리를 행하여 피막형성 거동을 관찰하였다. 주조용 알루미늄 합금은 다량의 석출물을 포함하고 있고 석출물들은 산화피막의 형성에 영향을 미치게 된다. 본 연구에서는 주조용 AC2A합금의 양극 산화 피막의 형성에 미치는 석출물들의 영향을 OM, SEM, LSCM을 사용하여 정밀하게 관찰해 보았다.

  • PDF

쌍롤형 박판주조공정에서 열박음을 고려한 열적 크라운해석 (The Effect of Shrink fit on the Thermal Crown Analysis in Twin Roll Strip Casting Process)

  • 박철민;박경진
    • 한국정밀공학회지
    • /
    • 제19권11호
    • /
    • pp.200-210
    • /
    • 2002
  • In twin roll strip casting process, coupled analyses of heat transfer and deformation for the cast roll are carried out by using the finite element program MARC to examine the thermal crown. Shrink fit effect and plastic deformation are considered. The results shows that the thermal crown is greatly influenced by shrink ft and that the thermal crown for POSCO Pilot Caster 2 Copper Roll has “M” shape. The effects of several factors on thermal crown are also investigated. The amount of thermal crown increases as heat flux, casting speed, steeve thickness and casting roll width increase and decreases as the casting roll diameter increases.

상변화와 접촉을 고려한 축대칭 주조 응고공정의 유한요소 해석 (Finite Element Analysis of Solidification Processes of Axisymmetric Castings Considering Phase Change and Contact)

  • Ghoo, B.Y.;Keum, Y.T.;Lee, J.K.
    • 한국정밀공학회지
    • /
    • 제14권1호
    • /
    • pp.126-141
    • /
    • 1997
  • The purpose of this research is to develope a FEM program for analyzing solidification processes of axisymmetric casting, considering phase changes and the contact between the metal and mold. Tempera- ture recovery method is employed fro considering the phase changes releasing the latent heat and the coin- cident node method is used for calculating the amount of heat transfer between the metal and mold. Tan- gent modulus algorithm is adopted for calculating flow stress and a gap element is employed for modeling the interface between the mold and metal in finding deformed shapes. In order to verify the developed program, axisymmetric aluminum and steel casting processes are simulated. Temperature distribution, phase front position, and shrinkage and porosity creation are compared with measurements, FIDAP results, and good agreements are examined.

  • PDF