• Title/Summary/Keyword: Extruded length

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Development of a Process to Simultaneously Weld and Extrude Pipe Using a Spring Type Wire Material (스프링형상 와이어소재를 이용한 접합동시 파이프 압출성형공정 개발에 관한 연구)

  • Ku, K.M.;Kim, T.H.;Jin, I.T.
    • Transactions of Materials Processing
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    • v.24 no.5
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    • pp.317-322
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    • 2015
  • A process for the concurrent welding and extruding of pipe was designed for continuous production of fin tubes. Unlike a conventional pipe extrusion, the new process is able to extrude a pipe continuously without limit of length by using spring type wire material. The current paper provides the basic research for welding during the extrusion using a spring type wire material. The object of the current study is to investigate the possibility that the spring type wire material could be extrude into a welded pipe. The appropriate extrusion ratio was selected through investigation of loads using computer simulations. As a result, experiments showed that pipe could be welded and simultaneously extruded with spring type wire material of aluminum. The tensile strength of the welded and extruded aluminum pipe can reach 80% of tensile strength of original aluminum feedstock.

A Comparision of the Twisting of Extrusion of Elliptical Shape with that of S shape from Round Billet by DEFORM-3DTM Software (원형빌렛으로부터 타원단면 및 S단면 가진제품의 압출가공의 DEFORM-3DTM에 의 한 비틀림 해석 비교)

  • 김진훈;김한봉;진인태
    • Proceedings of the Korean Society for Technology of Plasticity Conference
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    • 1997.03a
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    • pp.136-139
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    • 1997
  • Applications of commercial software DEFORM-3DTM for 3-D simulation in extrusion process are developed for the analysis of twisting of extruded products. Because the elliptical shape has at least one line symmetry, the twisting is not occured during the extrusion. But, the results of extrusion simulation of the elliptical shape show that the twisted boundary of the die surface makes the material inside die surface rotate with the constant angular velocity. Otherwise, the simulation results of the S shaped product show that the twisting can be occured by the only 180$^{\circ}$rotation symmetry of S shape without no line symmetry and show that the angular velocity increases by the only 180$^{\circ}$rotation symmetry without no twisted die surface between on the die entrance section and on the die exit section. The results of the analysis show that the angular velocity of the extruded product changes with die length and friction condition.

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A Study of the Twisting and Extrusion Process of the Product with Involute Helical Fin from the Round Billet (원형빌렛으로부터 인볼루트 헬리컬 핀을 가진 제품의 비틀림 압출가공법에 관한 연구)

  • 김한봉
    • Proceedings of the Korean Society for Technology of Plasticity Conference
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    • 1999.03b
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    • pp.111-114
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    • 1999
  • The twisting and extrusion process of the product with involute helical fin from the round billet is developed by the upper bound analysis. The twisting of extruded product is caused by the twisted die surface connecting the die entrance section and the die exit section linearly. In the analysis, the internal shear surface is defined as the curved twisted plane from the taisting of die surface and the shear work is calculated by the consumption of shear energy The increase rate of angular velocity is determined by the minimization of plastic work. The results of the analysis show that the angular velocity of the extruded product increases with the die twisting angle, the reduction of area, and decreases with the die length, the friction condition.

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Effect of the Extrusion Ratios on Fiber Breakage and Orientation in Hot Extrusion Process in Metal Matrix Composites (금속복합재료의 열간압출공정에 있어서 압출비가 섬유의 파단 및 배향에 미치는 영향)

  • Kang, C.G.;Kang, S.S.;Kim, B.H.
    • Transactions of the Korean Society of Mechanical Engineers
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    • v.17 no.7 s.94
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    • pp.1740-1750
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    • 1993
  • The aluminar short fiber reinforced composite materials for hot extrusion were fabricated by semi-solid stirring method, and extruded at extrusion temperature $400^{\circ}C$ with various extrusion ratio. The hot extrusion load of volume fraction 15% metal matrix composites and base alloy Al7075 has been compared. The fiber length distribution, fiber breakage and fiber orientation are investiged to know the fiber behaviour in before and after hot extrusion. The tensile strength of the hot extruded billet are experimentally determined for different of extrusion ratios, and compared with theorically calculated strength.

A Study of the Twisting and Extrusion Process of the Product with Trapezoidal Helical Fin from the Round Billet (원형빌렛으로부터 나선형 사다리꼴 핀을 가진 제품의 비틀림 압출가공법에 관한 연구)

  • 김한봉;진인태
    • Transactions of Materials Processing
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    • v.8 no.2
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    • pp.143-151
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    • 1999
  • The twisting and extrusion process of the product with trapezoidal helical fin from the round billet is developed by the upper bound analysis. The twisting of extruded product is caused by the twisted die surface connecting the die entrance section and the die exit section linearly. In the analysis, the rotational velocity in angular direction is assumed by the multiplication of radial distance and angular velocity. The angular velocity is increased linearly by axial distance from the die entrance. The increase rate of angular velocity is determined by the minimization of plastic work. The results of the analysis show that the angular velocity of the extruded product increases with the die twisting angle, the reduction of area, and decreases with the die length, the friction condition.

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A Study on Friction stir welding Properties of Extruded Aluminum Panels for Rolling Stock (철도차량용 알루미늄 압출 패널의 마찰교반용접 특성에 관한 연구)

  • Park, Young-Bin;Goo, Byeong-Choon;Koo, Jeong-Seo
    • Proceedings of the KSR Conference
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    • 2008.06a
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    • pp.2053-2058
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    • 2008
  • Extruded aluminium panels have been widely used for railway vehicle structures because of their light specific weight and other merit. In the past, GMAW (Gas Metal Arc Welding) and GTAW (Gas Tungsten Arc Welding) were mainly used to join aluminium panels. But recently friction stir welding (FSW) is widely used. due to its lots of advantage. In this study aluminium A6005-T6 which are used for car body structures was chosen. The influence of main parameters such as : pin rotating speed, welding speed, shoulder diameter, pin length and tilting angle on mechanical properties was examined. Optical microscope observation, micro hardness test and tensile test were carried out. Tensile strength of the stir welded plates is 74% of that of the base material.

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An Upper-Bound Analysis of the Square-Die Forward Extrusion of Regular Polygonal-Shaped Tubes from hollow-Cylindrical Billets at Final Stage (중공 원형 소재로부터 다각형 튜브 제품의 평금형 전방 압출에 대한 최종단계의 상계해석)

  • Kim, Dong Kwon;Cho, Jong Rae;Bae, Won Byong
    • Journal of the Korean Society for Precision Engineering
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    • v.12 no.11
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    • pp.91-97
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    • 1995
  • In this study, a deformation model for the regular polygonal-shaped tubes from hollow-cylindrical billets is proposed and a kinematically admissible velocity field is obtained from this deformation model. The final stage upper-bound extrusion load and the average extruded length are determined by minimizing the total power consumption with respect to chosen parameters. Experiments have been carried out with hard solder billets at room temperature. The theoretical predictions of the extrusion load are in good agreements with the experimental results and there is generally reasonable agreement in average extruded height between theory and experiment.

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Effect of Die Geometry on Expansion of Corn Flour Extrudate (사출구 구조에 따른 옥수수가루 압출성형물의 팽화특성)

  • Gu, Bon-Jae;Ryu, Gi-Hyung
    • Food Engineering Progress
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    • v.15 no.2
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    • pp.148-154
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    • 2011
  • The objective of this study was to determine the effect of die geometry on expansion index of extruded corn flour. Water solubility index, water absorption index and specific mechanical energy (SME) input were analyzed to observe the relationship with die geometry. The feed moisture content was 20 and 25%. Die dimensions were tapered angle (57, 95o) and length/diameter (L/D) ratio of die land (0.67, 1.67 and 2.67). The SME input was the highest at 20% moisture content and 2.23E-10 m3 die constant. The sectional and volumetric expansion indices at 20% moisture were increased with increase in die constant. However, die constant did not influence sectional expansion index of corn flour extrudate at 25% moisture content. The extruded corn flour at 25% moisture content had higher longitudinal expansion index than those of extruded corn flour at 20% moisture content. Sectional expansion and longitudinal expansion index were negatively correlated. The water absorption index and water solubility index were not affected with the die constant.

Inclusion effect of soybean meal, fermented soybean meal, and Saccharina japonica in extruded pellet for juvenile abalone (Haliotis discus, Reeve 1846)

  • Yun, Ahyeong;Kim, June;Jeong, Hae Seung;Lee, Ki Wook;Kim, Hee Sung;Kim, Pil Youn;Cho, Sung Hwoan
    • Fisheries and Aquatic Sciences
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    • v.21 no.9
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    • pp.26.1-26.8
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    • 2018
  • Inclusion effect of soybean meal (SBM) and fermented SBM (FSM) in extruded pellet for juvenile abalone (Haliotis discus) was compared in abalone farm. Dietary inclusion effect of the combined macroalgae (MA) (Undaria pinnatifida and Hizikia fusiforme) and a single Saccharina japonica on abalone was also compared. Three thousand six hundred juvenile abalone were purchased from a private hatchery and acclimated to the experimental conditions for 2 weeks. Six 5-ton flow-through raceway tanks were used, and abalone were randomly distributed into tanks (n = 600 per tank). Three experimental diets were prepared in duplicate. Fish meal, FSM, corn gluten meal, and shrimp meal and wheat flour and dextrin were used as the protein and carbohydrate sources, respectively, in the FSM diet. MA was also included in the FSM diet. FSM and MA in the FSM diet were substituted with SBM at the expense of wheat flour and S. japonica, referred to as the SBM and SJ diets. The experimental diets were pelletized by an extruded pelleter. Water stability of nutrients in the experimental diets was monitored at 12, 24, and 48 h after seawater immersion. The experimental diets were fed to abalone once a day to satiation with a little leftover for 120 days. The retained crude protein and lipid and ash content of the extruded pellets were changed over all period of time. Weight gain and specific growth rate (SGR) of abalone fed the SBM diet were greater than those of abalone fed the FSM and SJ diets. Weight gain and SGR of abalone fed the SJ diet were also greater than those of abalone fed the FSM diet. The longest shell length, widest shell width, highest shell height, and greatest soft body weight were obtained in abalone fed the SBM diet, followed by the SJ and FSM diets. Proximates of the soft body of abalone were not different among the experimental diets. In conclusion, SBM was a superior protein source to FSM in extruded pellet for growth performance of abalone. Dietary inclusion of a single S. japonica was superior to the combined inclusion of U. pinnatifida and H. fusiforme in the production of abalone.

On the Damping Effects of Helmet Safety with a Corrugation Damper using Taguchi's Optimization Design (다구찌 설계법을 이용한 주름댐퍼를 갖는 헬멧안전의 감쇠효과에 관한 연구)

  • Kim, Chung-Kyun
    • Journal of the Korean Institute of Gas
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    • v.12 no.4
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    • pp.34-40
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    • 2008
  • Using the finite element method and Taguchi's design technique, the displacement in vertical direction, von Mises stress, and strain energy of the corrugation damper have been analyzed as functions of the extruded length and the thickness of the corrugation damper, and the upper and lower corner radii of the damper. The optimized profile design elements of a corrugation damper are very important for increasing a strain energy absorption capacity of a helmet structure, which is attacked by impulsive external forces. In this study, the optimized design data based on the Taguchi's method was computed as a corrugation damper length of L = 20 mm, a damper thickness of t = 2 mm, the upper corner radius of $R_1=4\;mm$, and the lower corner radius of $R_2=3\;mm$. The optimized design parameters of a corrugation damper indicated that the thickness and extruded length of a corrugation damper may affect to increase the strain energy, which absorbs the impact forces of the helmet.

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