• Title/Summary/Keyword: Paper Casting

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Comparison of the Microstructure and Mechanical Property between Gravity Casting Forging and Rheo-diecasting Forging using A356 Alloy (A356 합금의 중력 주조/단조와 Rheo-diecasting/단조의 미세조직 및 기계적 특성 비교)

  • Lee, Jun-Young;Lim, Jae-Yong;Lee, Seung-Yong;Moon, Seoug-Won;Hong, Chun-Pyo
    • Journal of Korea Foundry Society
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    • v.33 no.5
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    • pp.210-214
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    • 2013
  • Recently, the automotive industry has replaced cast iron to lightweight materials like aluminum for engine efficiency of automobiles and an emission control by government. In this paper we studied two auto parts manufacturing methods using an alloy of A356. That is gravity casting and H-NCM Rheo-diecasting forging. We analyzed the microstructure and mechanical properties for this method. In Microstructure analysis results, H-NCM Rheo-diecasting forging has more finer microstrucre and better forging effect. Resulting in better mechanical properties than gravity forging.

A Study on Rheology Forming Process of Al-7%Si Alloy with Electromagnetic Application (전자교반을 응용한 Al-7%Si 알루미늄 소재의 레올로지 성형공정에 관한 연구)

  • Ko J.H.;Seo P.K.;Kang C.G.
    • Transactions of Materials Processing
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    • v.15 no.3 s.84
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    • pp.195-205
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    • 2006
  • This paper focuses on a rheo-forming of am part fabricated by electromagnetic stirring system (EMS). This forming process take place under high pressure of high pressure die casting and thin walled casting is possible. Furthermore, the productivity is better than low pressure die casting because of shorter cycle time. The advantages of rheo-forming are performed in the semi solid state with laminar flow and the gas content is low, which makes welding possible. Therefore this research applies for arm part with EMS and has investigated the mechanical properties after T6 and T5 heat-treatment.

A Realization of the Process Chain from Reverse Engineering to Rapid Tooling (Reverse Engineering을 이용한 신속 기능성 시제품 제작)

  • 송용억;박세형;하성도
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • 1996.11a
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    • pp.841-845
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    • 1996
  • Reverse engineering enables a fast creation of CAD model from an existing part without any technical drawing or digital data. This method of data acquisition is necessary in several industrial applications when the modification of an existing product design has to be performed and verified afterwards. In this paper, the surface of an existing ship propeller was measured by a tactile measuring system and the acquired point data of the surface were used for modeling of a solid model in CAD system. By using LOM and casting processes, an aluminum propeller for functional test was manufactured and then its accuracy was measured by a laser scanner and compared with the origin릴 CAD data. As the results show, the use of LOM as a rapid prototyping process and casting as a secondary process delivers a functional prototype propeller which can be used for test purposes.

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Investigation of Interface Reaction between TiAl Alloys and Mold Materials

  • 김명균;김영직
    • Transactions of Materials Processing
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    • v.8 no.3
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    • pp.289-289
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    • 1999
  • This paper describes the investment casting of TiAl alloys. The effects of mold material and mold preheating temperature for the investment casting of TiAl on metal-mold interfacial reaction were investigated by means of optical micrography, hardness profiles and an electron probe microanalyzer. The mold materials examined were colloidal silica bonded ZrO₂, ZrSiO₄, A1₂O₃and CaO stabilized ZrO₂. When compared with conventional titanium a1loy, the high aluminum concentration of TiAl alloys helps to lower their reactivity in the molten state. The A1₂O₃mold is a promising mold material for the investment casting of TiAl in terms of the thermal stability, formability and cost. Special attention need to be paid to thermal stability and mold preheating when developing the investment calling of TiAl alloys.

Development of Arm Part by Indirect Press Process with Electromagnetic Stirring Application (간접가압방식에 의한 전자교반응용 암 부품 개발)

  • Ko J. H.;Seo P. K.;Kang C. G.
    • Proceedings of the Korean Society for Technology of Plasticity Conference
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    • 2005.10a
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    • pp.340-343
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    • 2005
  • This paper focuses on an rheo-forming of arm part fabricated by electromagnetic stirring system (EMS). This forming process take place under high pressure of high pressure die casting and thin walled casting is possible. Also the productivity is better than low pressure die casting because of shorter cycle time. The advantages of rheo-forming are performed in the semi solid state with laminar flow and the gas content is low, which makes welding possible. Therefore this research applies for arm part with EMS and has investigated the mechanical propriety after T6 and T5 heat-treatment.

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Thixoforging Process of Rheology Materials Fabricated by Spiral Mechanical Stirring Equipment (나선형 기계 교반 장비로 제조된 레오로지 소재의 Thixoforging 공정)

  • Jung, I.K.;Han, S.H.;Bae, J.W.;Kang, C.G.
    • Transactions of Materials Processing
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    • v.17 no.1
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    • pp.5-8
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    • 2008
  • As the semi-solid forming technology has a lot of advantages compared to the die casting, squeeze casting and hot/cold forging, it has been studied actively. This paper focuses on the thixoforging of the rheological materials fabricated by the spiral mechanical stirring equipment with A356 casting aluminum alloy and A6061 wrought aluminum alloy. Formability tests of rheological materials fabricated by spiral mechanical stirring were carried out and the microstructures of forged sample were observed. After thixoforging experiment, the heat-treated conditions of forged samples are investigated to improve the mechanical properties. These results are able to suggest the possibility of commercialization for rheological materials fabricated by spiral mechanical stirring.

Study on the Bond Mechanism of the Reinforcing Bars by Casting Direction of Recycled Coarse Aggregate Concrete using Acoustic Emission Method (음향방출기법을 이용한 순환굵은골재 콘크리트의 타설방향에 따른 철근의 부착메커니즘에 관한 연구)

  • Jeon, Su-Man;Yun, Hyun-Do;You, Young-Chan
    • Proceedings of the Korea Concrete Institute Conference
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    • 2006.11a
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    • pp.245-248
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    • 2006
  • The objective of this study is to take the first step in creating a user-friendly health monitoring system for recycled aggregate concrete structure using acoustic emission(AE). Each specimen was a cube, the edge of which was 150mm. For pull-out tests, a steel rebar, 13mm in diameter, was embedded in the center of each specimen and casting directions(i.e., vertical and horizontal) were considered in this paper. The AE parameters were analyzed for damage levels(i.e. internal cracking stage, pull-out stage) of all specimens. Results from this study show that event, duration versus amplitude of a signal, showed a clear difference for different loading stages depending upon the concrete casting directions.

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The Study of Efficiency and Characteristics Comparison between Aluminum and Copper Die Casting Induction Motor for Improving Efficiency (유도전동기 효율향상을 위한 알루미늄 및 동 다이캐스팅 적용 시의 동작특성 및 효율 비교연구)

  • Han, Pil-Wan;Lee, Ju
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.61 no.1
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    • pp.70-74
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    • 2012
  • Copper die casting motor (CDM) has a better design flexibility than aluminium die casting motor (ADM) because of the higher conductivity of copper. However, CDM has an economic and manufacturing weak point due to high copper price and high melting temperature compared to ADM. This paper describes a comparison of the design parameters, specifications, performances and material cost between CDM and ADM of 5.5kW_6P.

Load Sharing Control of Driven Roll in Continuous Caster (연속주조기에서 스트랜드 구동롤의 인발력 분배 제어)

  • 천창근;김철우
    • The Transactions of the Korean Institute of Power Electronics
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    • v.8 no.4
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    • pp.321-327
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    • 2003
  • As the continuous casting process is to product slab with high temperature liquid steel, the main role of strand driven roll is to withdraw slab from mold as operator set up casting speed pattern. The strand driven roll in old cast machine is controlled casting speed only. Due to inaccuracies in drive setting up, varying roll diameters, bulging in the product, withdrawal force was distributed irregularly. As a result, because of horizontal crack in slab comer, high casting speed can't be achieved. In this paper, the correlation between the distribution of withdrawal force and slab quality is investigated and the new control algorithm which can be distributed regularly the withdrawal force of strand driven roll is proposed. The principle of proposed algorithm is not to control motor torque directly but to control motor speed reference according to sharing ratio of withdrawal force which is set up in high level controller. The proposed algorithm implemented in POSCO Kwangyang 1-4 continuous casting plant.

A Micro Mobility Management Scheme in Wireless LAN Environments (무선 LAN환경에서 마이크로 이동성 지원 방안)

  • 고광신;차우석;김형준;조기환
    • Journal of KIISE:Information Networking
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    • v.31 no.2
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    • pp.158-170
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    • 2004
  • Mobile IP is a base protocol to support host mobility in IP-based wireless network. It is well known that the protocol contains two main delay factors on a handoff process; one is to detect a host movement, and the other is to register the host's current location to its home network. This paper examines Layer 2(L2) handoff procedure in the IEEE 802.11 Wireless LAN, and identifies these L2 triggers that can be usefully applied to Layer 3(L3) handoff. Then, the MCAA(Multiple-Casting using Anchor Agent) mechanism is proposed. It makes use of the L2 trigger and the network topology to construct an anchor agent dynamically, and the multiple-casting scheme to prevent an ongoing packet to be lost. Using a network simulator, the proposed mechanism has been evaluated the handoff delay and the packet lost point of view, in comparison with the regional registration protocol which is the most well known micro mobility support mechanism.