• Title, Summary, Keyword: Aluminum Tube

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A Study on the Characteristics of Aluminum Tube Hydroformed Products (알루미늄 튜브를 이용한 액압성형품 특성연구)

  • Yi, Hyae-Kyung;Lee, Gun-Yeop;Lee, Sung-Mun;Lee, Young-Seon;Moon, Young-Hoon
    • Transactions of the Korean Society of Mechanical Engineers A
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    • v.32 no.11
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    • pp.1010-1015
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    • 2008
  • In this study, the characteristics of aluminum tube hydroformed products at different extrusion type and heat treatment conditions were investigated. For the investigation, as-extruded, full annealed and T6-treated Al 6061 tubes at different extrusion type were prepared. To evaluate the hydroformability, free bulge test was performed at room temperature to $300^{\circ}C$. Also mechanical properties of hydroformed products at various pre- and post-heat treatments were estimated by hexagonal prototype hydroforming test at $250^{\circ}C$. And the tensile test specimens were obtained from hexagonal prototype hydroformed tube. As a results, hydroformability of full annealed tube is $5{\sim}8%$ higher than that of extruded and T6-treated tube. The tensile strength and elongation of T6-post heat treated indirect extrusion tube were more than 330MPa and 12%, respectively. However, T6 pre treated hydroformed product represents high strength, 330MPa and low elongation, 8%. Therefore, Hydroformability of Al6061 tube showed similar value for both extrusion types. However flow stress of direct tube showed $20{\sim}50MPa$ lower value than indirect tube.

Extru-Bending Process for Aluminum Tube Products with Rectangular Sections (각단면을 가지는 알루미늄 튜브제품의 압출굽힘가공)

  • 박대윤;진인태
    • Proceedings of the Korean Society for Technology of Plasticity Conference
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    • pp.285-288
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    • 2003
  • The bending phenomenon during extruding one product using four billets can be obtain by the difference of hole diameters in the multi-hole container. The difference of hole diameter caused the difference of billet amount inserted in the die cavity. As results, it can bend during extruding products by the different amount of two billets and by the cohesion of billets in the porthole dies cavity. And the bending curvature can be controlled by the size of holes and billets. The experiments using aluminium material had been done for the rectangular and square curved tube product. The results of the experiment show that the curved aluminum tube product can be bended by the extru-bending process without the defects such as the distortion of section and the thickness change of the wall of tube and the folding and wrinkling. The curvature of product is affected by shape of cross section and the difference of billet diameters. It is known that the welding and extruding and bending can be done simultaneously in the die cavity when a rectangular hollow curved tube would be extruded by porthole dies using four different size billets made of aluminum material.

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Hot Air forming Analysis of Aluminum Tube (알루미늄 튜브의 열간가스 성형해석)

  • Kim, H.Y.;Lim, H.T.;Hwang, S.H.;Lee, K.D.;Lee, W.S.;Kim, D.Y.
    • Proceedings of the Korean Society for Technology of Plasticity Conference
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    • pp.116-119
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    • 2007
  • The application of light weight materials, such as aluminum alloy, has been limited due of their poor formability. Especially, aluminum alloy tube has limited expansion capability at most 15% at room temperature. New manufacturing process, called hot air forming, is introduced to apply aluminum tube to the automotive suspension components which have complex shape and require high expansion ratio about 40%. The process is carried out at the elevated temperature above $500^{\circ}C$, so numerous material properties and process parameters related to the high temperature should be investigated and determined to get a sound product. In this study, the effect of thermal properties and forming parameters such as the temperature of tool, axial feeding and gas pressure are analyzed by using explicit finite element method.

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Comparison of 2D and 3D Pre-bending in a Aluminum Tube Hydroforming Process (알루미늄 튜브 하이드로포밍에 대한 2D와 3D 예비 굽힘 공정의 효과 비교)

  • Kim H. Y.;Kim H. J.;Lim H. T.;Park K. C.;Park C. S.;Lee D. J.
    • Proceedings of the Korean Society for Technology of Plasticity Conference
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    • pp.142-147
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    • 2004
  • The aluminum tube hydroforming is a manufacturing process which can provide lightweight components as automotive parts. In this paper, the hydroformability of aluminium tube in different condition of bending process is presented. An investigation has been conducted on how to control the deformed shape and its effect on thinning distribution after hydroforming by using finite element simulation. Finite element simulation of tube hydroforming for automotive trailing arm is carried out to explore the effect of 2-dimensional and 3-dimensional bending.

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Study on the Influence of Pre-bending in an Aluminum Tube Hydroforming (알루미늄 튜브 하이드로포밍에서의 예비 굽힘 공정의 효과에 관한 연구)

  • Lim, Hee-Taek;Park, Kyoung-Chang;Kim, Hyung-Jong;Kim, Heon-Young
    • Journal of Industrial Technology
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    • v.24 no.B
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    • pp.199-206
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    • 2004
  • Recently social demands of fuel economy and environmental regulations require the development of lightweight components and new manufacturing technologies. The aluminum tube hydroforming is a manufacturing process which can provide lightweight components as automotive parts. In this paper, the hydroformability of aluminium tube in different condition of bending process is presented. An investigation has been conducted on how to control the deformed shape and its effect on thinning distribution after hydroforming by using finite element simulation. Finite element simulation of tube hydroforming for automotive trailing arm is carried out to explore the effect of 2-dimensional and 3-dimensional bending.

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Microstructure and Mechanical Property of Aluminum Powder Compact by Powder-in Sheath Rolling Method (분말시스압연법에 의해 제조된 알루미늄 분말성형체의 조직 및 기계적 성질)

  • 이성희
    • Journal of Korean Powder Metallurgy Institute
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    • v.9 no.3
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    • pp.153-160
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    • 2002
  • A nitrogen gas atomized aluminum powder was consolidated by powder-in sheath rolling method. A pure aluminum tube with outer diameter of 12 mm and wall thickness of 1mm was used as a sheath. The aluminum tube filled with the aluminum powder, first, was cold-rolled to the thickness of 6mm for performing, and then consolidated by the cold rolling and/or subsequent hot rolling at 360, 460 and $560^{\circ}C$. The aluminum powder compact fabricated by the sheath rolling showed high relative density more than 0.96 at any rolling conditions. The 0.2% proof stress increased with increasing hot rolling reduction and hot rolling temperature. Tensile strength was hardly affected by change in the hot rolling reduction, whereas it decreased with increasing hot rolling temperature. The powder compact showed the large elongation when cold rolling or hot rolling reduction was large. It was found that the sheath rolling was an effective method for consolidation of aluminum powder.

The effects of non-condensable gas on condensation heat transfer on a super-hydrophobic surface tube (초소수성 코팅 튜브에서의 비응축가스 영향에 대한 응축 열전달 연구)

  • Ji, Dae-Yun;Kim, Daeho;Lee, Kwon-Yeong
    • Journal of the Korea Academia-Industrial cooperation Society
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    • v.19 no.4
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    • pp.517-524
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    • 2018
  • This purpose of this research is to observe the influence of non-condensable gas (NCG) on a horizontal super-hydrophobic aluminum tube and compare it with a bare aluminum tube. To achieve super-hydrophobic characteristics, an aluminum tube was coated with a Self-Assembled Monolayer (SAM). The overall heat transfer coefficient U was used to represent the condensation performance. The NCG mass fraction was the main variable, and its range was 0.08 to 0.45. The condensation performance of the SAM tube and bare tube increased with decreasing mass fraction of NCG. The SAM tube showed 1.9 to 2.5 times larger dropwise condensation performance than the bare tube. When the mass fraction of NCG decreased in the SAM tube, the rate of increase of the SAM tube was lower because flooded condensation occurred. In addition, filmwise condensation occurred in the SAM tube when more active condensation was generated, and its performance was lower than that of the bare aluminum tube. The flooded and filmwise condensation in the SAM tube is explained by the pinning effect. In conclusion, controlling the condition of the condenser is necessary to improve the condensation performance by surface modification a SAM.

Performance evaluation of brazed aluminum heat exchangers for a condenser in residential air-conditioning applications (가정용 공조기의 응축기 적용 알루미늄 열교환기의 성능 평가)

  • 김만회;김권진
    • Korean Journal of Air-Conditioning and Refrigeration Engineering
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    • v.10 no.1
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    • pp.44-55
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    • 1998
  • The evaluation of aluminum flat tube and louver fin heat exchangers for a condenser in residential air-conditioning applications has been conducted. A series of tests for two-different brazed aluminum heat exchangers was performed and the results were compared with conventional fin and tube heat exchangers for residential air-conditioning system. Refrigerant charge amount for a window-system air-conditioner with the brazed aluminum condenser is decreased by 35% and the volume and material of heat exchanger can be reduced by 50% compared to the conventional fin and tube heat exchangers.

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A Study on the Stress and Displacement Behaviors of an aluminum Tube in OPC Toner Cartridge (토너카트리지 OPC 드럼용 Al 튜브의 응력 및 변형거동에 관한 연구)

  • Kim, Chung-Kyun
    • Tribology and Lubricants
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    • v.23 no.3
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    • pp.89-94
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    • 2007
  • The stress and displacement behavior analysis of an aluminum tube for an organic photo conductor drum has been presented using a finite element analysis technique by non-linear FEM program. The maximum displacement in the radial direction of OPC drum may directly affect to the quality of printed matter. Thus, the deformed profile of the aluminum tubes should be limited depending on the toner powder size and the contact rolling forces between an OPC drum and a paper. This paper recommends the critical loading of 400 Pa for the provided toner size, $8{\mu}m$ for excellent printed matters and long life of the toner cartridge.