• Title, Summary, Keyword: Extrusion Conditioning

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Process analysis and prediction of die strength of condenser tube with 12 holes in hot extrusion (12홀 컨덴서 튜브의 열간 압출 공정해석 및 금형의 강도예측)

  • Lee S. H.;Jo H. H.;Kim B. M.
    • Proceedings of the Korean Society for Technology of Plasticity Conference
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    • pp.436-439
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    • 2005
  • Condenser tube has been used as a component of heat exchanger in automobile and air conditioning apparatus. In this paper, porthole die extrusion that is advantageous to form long hollow section tube is analyzed by direct extrusion of condenser tube with 12 holes. A study on extrusion process is performed through the 3D FE simulation at non-steady state and extrusion experiments. Especially, weldability, extrusion load and die defects were estimated try FE-simulation. This study present the redesigned die of direct extrusion in consideration of the results obtained from FE-analysis.

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Extrusion Process Analysis and Evaluation of Integrity for Condenser Tube by Using CAE (CAE를 이용한 컨덴서 튜브의 직접압출공정 해석 및 튜브 건전성 평가)

  • Bae J. H.;Lee J. M.;Kim B. M.;Jo H. H.;Kim J. H.;Jo O. J.
    • Proceedings of the Korean Society for Technology of Plasticity Conference
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    • pp.23-26
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    • 2004
  • This paper describes the analysis of extrusion process and integrity for the condenser tube which is component of the heat exchanger in automobile and air conditioning apparatus. As development of the analysis method using computer, recently. It have been applied to the 3-dimensional hot extrusion process with complex section area of the non-steady statement and then results of the analysis have been applied to optimal die design and process design. As the result, this paper confirmed that used extrusion die of the research is satisfactorily designed to dimensional accuracy. And the stress point of view, condenser tube confirmed that it was influenced by the flow pressure of alternative regrigerants.

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Extrusion Process Analysis for Al Condenser Tube with Multi Hole (다공 Al 컨덴서 튜브의 압출공정 해석)

  • Bae J. H;Lee J. M;Kim B. M
    • Transactions of Materials Processing
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    • v.13 no.8
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    • pp.723-730
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    • 2004
  • This paper describes the analysis of extrusion process and integrity for a condenser tube which is a component of the heat exchanger in automobile and all conditioning apparatus. Recently, according to the development of analysis method using the computer, the numerical simulation have been applied to the 3-dimensional hot extrusion process with complex section area of the non-steady statement and then results of the analysis have been applied to optimal die design and process design. In this paper, firstly, the die design was performed for a condenser tube with a multi-hole section and the rigid-plasticity FE analysis performed of extrusion process. Secondly, we estimated metal flow of billet, extrusion load, welding pressure in chamber etc. and evaluated the pressure and elastic strain of the die land and mandrel tooth profile through a stress analysis of the die. Finally, the extrusion test was performed to estimate the validity of FE analysis. This paper confirmed that the designed extrusion die of the research is satisfactorily designed fur integrity of condenser tube.

A Study of Extrusion Process for Al 3003 Condenser Tube (Al 3003 컨덴서 튜브의 직접압출 연구)

  • Bae, Jae-Ho;Lee, Jung-Min;Kim, Byung-Min
    • Transactions of the Korean Society of Mechanical Engineers A
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    • v.29 no.8
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    • pp.1043-1050
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    • 2005
  • Condenser tube is a component of the heat exchanger in automobile and air conditioning apparatus. It is generally made from the 1000 or 3000 series Al alloys that have good heat efficiency. In the case of 3000 series, these have high strength and hardness but have the disadvantage of low extruability. The development of extruding process in condenser tube with 3000 series Al alloys is studied in this paper. A study on extrusion process is performed through the 3D FE simulation in non-steady state and extrusion experimentation. Also, nano-indentation test is employed to estimate the weldability of tubes. Especially, An evaluation of the weldability using the nano-indentation is accomplished as compared with nano-hardness of welded part and the others in cross-section of tube.

Effects of Extrusion Condition of Barley on the Growth and Nutrient Utilization in Growing Pigs

  • Piao, X.S.;Chae, B.J.;Kim, J.H.;Jin, J.;Cho, W.T.;Han, In K.
    • Asian-Australasian Journal of Animal Sciences
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    • v.12 no.5
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    • pp.783-787
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    • 1999
  • To study the effects of different extrusion conditions of barley on growth performance, nutrient digestibility and nutrient excretion in feces, a total of 150 growing pigs ($Landrace{\times}Duroc{\times}Large$ White; average 24.4 kg body weight) were allotted to five treatments, in a completely randomized block design. The experimental diets were based on corn-soybean and 30% of barley was included in each diet; barley was the only extruded ingredient. The treatments were 1) no extrusion (Control); 2) extrusion at $100^{\circ}C$ without preconditioning (ENLT); 3) extrusion at $150^{\circ}C$ without preconditioning (ENHT); 4) extrusion at $100^{\circ}C$ with preconditioning (ECLT); 5) extrusion at $150^{\circ}C$ with preconditioning (ECHT). Temperature in the barrel was controlled within ${\pm}5^{\circ}C$ by feed rate with the addition of water at the rate of $3{\ell}\;per\;min$. in the extruder for each treatment. For the 6 week experimental period, extrusion of barley improved the average daily gain (ADG) and digestibilities of dry matter, crude protein and gross energy in growing pigs. As compared to control, significant improvements in ADG (p<0.05) were shown in the groups of feeding extruded barley at high temperature (ENHT and ECHT). There were also significant differences in the digestibilities of DM, CP and P between extrusion temperatures. Barley extruded at high temperature gave better digestibilities of DM, CP and GE than barley extruded at low temperature. Extruded barley diet groups showed significantly (p<0.05) lower excretions of DM, nitrogen (N) and P per kg gain as compared to the ground barley group. DM, N and P excretion per kg gain were also significantly lower in pigs fed barley extruded at $150^{\circ}C$ than at $100^{\circ}C$. In conclusion, extrusion considerably improved the nutritive value of barley and it appeared that temperature is the most important variable.

Effects of Extrusion Process Parameters on Puffing of Extruded Pellets (압출성형 공정변수가 압출성형 펠릿의 팽화에 미치는 영향)

  • Kim, Jae-Hyun;Ryu, Gi-Hyung
    • Korean Journal of Food Science and Technology
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    • v.33 no.1
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    • pp.55-59
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    • 2001
  • Pressure-puffing system or extruder has been used to puff rice kernel or rice flour. Most of the study on rice puffing were the effect of process conditions such as moisture content and heating temperature on physical and chemical characteristics of popped rice. The study on mechanism and development of instant puffed rice like popcorn has been limited. Extruded waxy rice pellets were puffed in a microwave oven after drying and conditioning. Extruded pellets were formed with extrusion conditions of $20{\sim}27%$ moisture content, 2.76 MPa $CO_2$ gas injection pressure and 200 rpm screw speed. Under these conditions, puffed waxy rice pellets in microwave oven had low density and soft texture. Density and texture of puffed waxy rice pellet could be optimized by control of moisture content, $CO_2$ gas injection pressure and screw speed that affect significantly when puffing extruded waxy rice pellet.

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