• Title, Summary, Keyword: Aluminum Tube

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On the Surface Defect Analysis of an Aluminum Tube for an OPC Drum using n SEM and EDX (SEM/EDX를 이용한 OPC 드럼용 Al 튜브의 표면결함 분석에 관한 연구)

  • Kim, Chung-Kyun
    • Tribology and Lubricants
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    • v.23 no.4
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    • pp.143-148
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    • 2007
  • The surface defects of an aluminum tube for an OPC drum have been analyzed using a scanning microscopy(SEM) and an energy dispersive X-ray analyze.(EDX). The SEM/EDX system, which may provide good information on the surface defects and their distributions, provides an optical diameter of an impurity and a chemical composition. These are strongly related on the coated film thickness and quality of an OPC drum, which is a key element of a toner cartridge for a laser printer. The experimental results show that the local deformations, scratch wear, and flaws are produce the non-uniform coating layers, which may be removed by a manufacturing process of an aluminum tube. The major parameters on the coating quality of an OPC drum are the impurities of an aluminum tube such as silicon, oxygen, calcium, carbon, sulphur, chlorine, and others. These impurities may be removed by an ingot molding, extrusion and drawing, quality control, and packing processes with a strict manufacturing technology.

Performance Comparison of Fin-Tube Heat Exchanger and Aluminum Heat Exchanger (핀 튜브 열교환기와 알루미늄 열교환기의 성능 비교)

  • Chang, K.S.;Lee, H.S.;Kim, J.D.;Hong, S.R.
    • Proceedings of the SAREK Conference
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    • pp.408-413
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    • 2008
  • This study presents comparison of the air side heat transfer and friction characteristics in a heating condition between Louver fin-tube heat exchangers and aluminum heat exchangers. Experiments are performed for the Louver fin-tube heat exchangers and aluminum heat exchangers using a calorimeter, which is designed based on air-enthalpy method described in ASHRAE standards. The air velocities its are varied from 0.7 to 1.6 m/s with 0.3 m/s interval. A study result shows that the heat transfer performances of aluminum heat exchangers are $40{\sim}80%$ higher than those of Louver fin-tube heat exchangers per unit volume, mass and heat transfer area.

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A Study on the Local Buckling Collapse Behavior of an Aluminum Square Tube Beam under a Bending Load (굽힘하중을 받는 알루미늄 사각관 보의 국부적 좌굴붕괴 거동에 관한 연구)

  • Lee, Sung-Hyuk;Choi, Nak-Sam
    • Transactions of the Korean Society of Mechanical Engineers A
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    • v.27 no.12
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    • pp.2011-2018
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    • 2003
  • To analyze the bending collapse behavior of an aluminum square tube beam under a bending load, a finite element simulation for the four-point bending test has been performed. Using an aluminum tube beam specimen partly inserted with two steel bars, the local buckling deformation near the center of the tube beam was induced. The maximum bending load and the bending collapse behavior obtained from the numerical simulation were in good agreement with experimental results. Using a combination of the four-point bending test and its finite element simulation, analysis of the local buckling and the accompanied bending collapse behavior of aluminum tube beam could be quantitative accomplished.

Forming Analysis and Formability Evaluation for Aluminum Tube Hydroforming (알루미늄 튜브 하이드로포밍 성형 해석 및 성형성 평가)

  • Lim, H.T.;Kim, H.J.;Lee, D.J.;Kim, H.Y.
    • Transactions of Materials Processing
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    • v.15 no.2
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    • pp.138-142
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    • 2006
  • A tube hydroformability testing system was designed and manufactured to observe the forming steps and to provide arbitrary combination of internal pressure and axial fred. The forming limit diagram of an aluminum tube was obtained from the free bulge test and the T-shape forming test using this system, giving the criteria for predicting failure in the hydroforming process. The hydroformability of aluminum tube according to different conditions of a prebending process was discussed, based on the finite element analysis and the forming limit test. The effects of 2D and 3D pretending on the tube hydroforming process of an automotive trailing arm were evaluated and compared with each other.

Forming Analysis and Formability Evaluation for Aluminum Tube Hydroforming (알루미늄 튜브 하이드로포밍 성형 해석 및 성형성 평가)

  • Lim H. T.;Kim H. Y.;Kim H. J.;Lee D. J.
    • Proceedings of the Korean Society for Technology of Plasticity Conference
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    • pp.243-246
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    • 2005
  • A tube hydroformability testing system was designed and manufactured to observe the forming steps and to provide arbitrary combination of internal pressure and axial feed. The forming limit diagram of an aluminum tube was obtained from the free bulge test and the T-shape forming test using this system, giving the criteria for predicting failure in the hydroforming process. The hydroformability of aluminum tube according to different conditions of a prebending process was discussed, based on the finite element analysis and the forming limit test. The effects of 2D and 3D prebending on the tube hydroforming process of an automotive failing arm were evaluated and compared with each other.

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A Study on the Evaluation Method for Bending Collapse Behavior of an Aluminum Square Tube (굽힘붕괴를 수반하는 알루미늄 사각관의 시험법에 관한 연구)

  • 이성혁;최낙삼
    • Proceedings of the Korean Society For Composite Materials Conference
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    • pp.123-126
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    • 2002
  • To evaluate the bending collapse behavior of an aluminum square tube, a finite element simulation for the four-point bending test was suggested. Local buckling deformation near the center of an aluminum tube specimen was induced which has been partly inserted by two steel bars. Simulation results showed good agreements with those of experiment.

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Hot Air Forming Analysis of Automotive Rear Sub Frame using Aluminum Tube (알루미늄 튜브를 이용한 자동차 리어 서브 프레임의 열간가스 성형해석)

  • Kim, H.Y.;Yoon, S.J.;Lee, K.D.;Kim, Y.S.
    • Proceedings of the Korean Society for Technology of Plasticity Conference
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    • pp.26-29
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    • 2008
  • Recently, the hydroforming of high strength aluminum tubes has many studies and applications in manufacturing industry, especially in automotive industry. But high strength aluminum tube has limited expansion capability at most 15% at normal temperature. New manufacturing process, called hot air forming, is introduced to apply aluminum tube to the automotive sub frame 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 high temperature should be investigated and determined to get a sound product. In this paper, the hot air forming process of automotive sub frame was investigated. The effect of the forming parameters such as the temperature of tool, axial feeding and gas pressure are analyzes by using explicit finite element method.

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A study on the heat recovery Characteristics of double tube type heat recovery ventilation system by double pipe material (이중관 재질에 따른 이중관형 열회수 환기장치의 열회수 특성 연구)

  • Kim, Eun-Young;Cho, Jin-Pyo
    • Journal of the Korea Academia-Industrial cooperation Society
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    • v.18 no.4
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    • pp.21-26
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    • 2017
  • In this study, performance tests were conducted to investigate the applicability of a double-tube heat recovery ventilation system. Paper, aluminum, polymer, were investigated as materials for the inner tube using the same exhaust-air volume. In all cases, the temperature exchange efficiency of the aluminum tube was the highest, while the paper tube showed similar results to those of the polymer tube. This probably resulted from the differences in thermal conductivity and thicknesses of the materials. The humidity exchange efficiency was the highest for the paper tubes in all cases, while the aluminum tubes and polymer tubes showed similar results. The total heat exchange efficiency, which includes the values of humidity exchange and temperature exchange, was highest in the case of the paper tube, and the aluminum tube and the polymer tube showed similar results. In the case of the paper tube, sensible heat and latent heat exchange occur at the same time, and the coefficient of energy of the aluminum tube and polymer tube are large values, when to be compared with only applicably sensible heat exchange coefficient of the aluminum tube and the polymer tube of total heat exchange efficiency value. The results of this study could be applied to the design of a ventilation system.

JOINING OF THIN-WALLED ALUMINUM TUBE BY ELECTROMAGNETIC FORMING (EMF)

  • PARK Y.-B.;KIM H.-Y.;OH S.-I.
    • International Journal of Automotive Technology
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    • v.6 no.5
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    • pp.519-527
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    • 2005
  • Recently, weight reduction of vehicles has been of great interest and consequently the use of low-density materials in the automotive industry is increasing every year. However, the substitution of one material for another is not simple because it accompanies several problems, for example, weakness in the strength and stiffness and difficulty in the joining. To overcome these problems, the structure of the automobile redesigned totoally. Aluminum spaceframe is rapidly being adopted as a body structure for accommodating lightness, stiffness and strength requirement. In aluminum spaceframe manufacturing, it is often required to join aluminum tube. However, there are few suitable methods for joining aluminum tube, so that much interest has been focused on testing suitable joining methods. Joining by electromagnetic forming (EMF) can be useful method in joining aluminum tube, which offers some advantages compared with the conventional joining methods. In this paper, joining by EMF was investigated as a pre-study for applying an automotive spaceframe. Finite element simulations and strength tests were performed to analyze the influence of geometric parameters on joint strength. Based on these results, configurations of axial joint and torque joint were suggested and guidelines for designing EMF joint were established.

Warm Hydroforming Characteristics of High Strength Aluminum Tubes (고강도 알루미늄 튜브의 온간 하이드로포밍 특성)

  • 이문용;강창룡;이상용
    • Transactions of Materials Processing
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    • v.13 no.5
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    • pp.403-408
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    • 2004
  • Hydroformability of 6061 and 7075 aluminum tube materials was studied by warm hydroforming experiments. A special tooling and heating system was designed and manufactured in order to perform warm hydroforming between room temperature and $300^{\circ}C$. The control of tube temperature for warm hydroforming was made by the control of temperature of oil medium. Warm hydroformability was analyzed by tube appearances, tube elongation and hardness values. Hydroforming characteristics of 6061 and 7075 tubes showed different temperature dependence between room temperature and $300^{\circ}C$. The difference in hydroformabilities of 6061 and 7075 at elevated temperatures was interpreted by the different sensitivity to dynamic strain aging of both aluminum materials.