• 제목/요약/키워드: hot extrusion method

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AM80 마그네슘 합금의 미세조직 및 기계적 특성에 대한 압출조건의 영향 (Effect of Extrusion Conditions on Microstructures and Mechanical Properties of AM80 Magnesium Alloys)

  • 이상구;김덕현;김대환;임수근
    • 소성∙가공
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    • 제27권6호
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    • pp.379-385
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    • 2018
  • This study investigated the effect of extrusion conditions on microstructures and mechanical properties of AM80 magnesium alloys. The billets of magnesium alloy used for hot extrusion were prepared by permanent mold casting method, and its extrusion was hot direct extrusion with different extrusion conditions. The results of microstructural analysis showed that the main phases in the as-casted alloys were ${\alpha}-Mg$, ${\beta}-Mg_{17}Al_{12}$, and lamella $Mg_{17}Al_{12}$. Hot extrusion results, The tensile strength of the most soundly manufactured extruded bars (extrusion temp: $350^{\circ}C$, extrusion ratio: 27:1, ram speed: 2mm/s) was approximately 327MPa at room temperature. The increase in the mechanical properties of hot-extruded alloys was as a result of grain refinement by dynamical recrystallization during hot extrusion.

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

  • 강충길;강성수;김봉향
    • 대한기계학회논문집
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    • 제17권7호
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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.

변형가시화법을 이용한 열간 축대칭 평금형 압출의 실험적 해석 (An Experimental Analysis for Axisymetric Hot Extrusion Through Square Dies Using Visioplasticity Method)

  • 엄태복;한철호
    • 한국소성가공학회:학술대회논문집
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    • 한국소성가공학회 1995년도 춘계학술대회논문집
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    • pp.107-113
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    • 1995
  • To investigate the behavior of platic deformation inaxisymmetric hot extrusion through square dies, the physical modelling with the plasticine as a model material is carried out at the room temperature. Some mechanical properties of the model material are determined by compression and ring compression tests. Visioplasticity method using experimetal grid distortion is introduced to anlayze the plastic flow, strain rate and strain distribution.

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금속복합재료의 열간압출에 관한 금형설계의 최적화기법(I) (Optimization Techniques of Die Disign on Hot Extrusion Process of Metal Matrix Composites)

  • 강충길;김남환;김병민
    • 소성∙가공
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    • 제6권4호
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    • pp.346-356
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    • 1997
  • The fiber orientation distribution and interface bonding in hot extrusion process have an effect on the maechanical properties of metal matrix composites(MMC's). Aluminium alloy matrix composites reinforced with alumina short fibers are fabricated by compocasting method. MMC's billets are extruded at high temperature through conical and curved shaped dies with various extrusion ratios and temperature. This present study was directed to describe the systematic correlation between extrusion die shape and subsequent results such as fiber breakage, fiber orientation and tensile strength to hot extruded MMC's billet. Extrusion load, tensile strength and hardness for variation of extrusion ratios and temperature are investigated to examine mechanical properties of extruded MMC's SEM fractographs of tensile specimens are observed to analyze the fracture mechanism.

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난성형 T형상 알루미늄 부품의 성형공정 해석 및 실험 (Forming Analysis and Experiment of Hard to Forming T Shape Aluminum Part)

  • 진철규
    • 한국산업융합학회 논문집
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    • 제20권2호
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    • pp.141-148
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    • 2017
  • A process comprising a hot extrusion process and a warm forging process was designed to form a T-shaped aluminum structural component with a high degree of difficulty by the plastic forming method. A circular cylindrical part was extruded with a hot extrusion process, and then an embossing part was formed with a warm forging process. The formability and the maximum load required for forming were then determined using a forming analysis program. The hot extrusion process was executed at $450^{\circ}C$ under the extrusion speed at 6 mm/s, while the warm forging process was executed at $260^{\circ}C$ under the forging speed at 150 mm/s. For both the processes, a condition by which friction would not be generated between the mold and the material was implemented. The analysis results showed that the load required for hot extrusion was 1,019 tons, while the load required for the warm forging was 534 tons. The T-shaped part was manufactured by using a 1,600 tons capacity press. The graphite lubricant was coated on the mold as well as the material. A forming experiment was performed under the same condition with the analysis condition. The measured values from the load cell were 1,210 tons in the hot extrusion process and 600 tons in the warm forging process.

곡면금형을 통한 축대창 열간 압출의 ALE 유한요소 해석 (Finite Element Analysis of Axisymmetric Hot Extrusion Through Continuous Dies Using the Arbitrary Lagrangian-Eulerian Description)

  • 강연식;양동열
    • 소성∙가공
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    • 제4권1호
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    • pp.69-78
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    • 1995
  • The arbitrary Lagrangian-Eulerian(ALE) finite element analysis is applied to the axisymmetric hot extrusion through continuous dies. In order to simulate hot forming problems, an ALE scheme for temperature analysis is proposed. The computed results are compared with experimental results as with those by pure Lagrangian method. In the present study mesh control is accomplished by the use of isoparametric mapping of quadrilaterals.

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금형 베어링 효과를 고려한 평금형 열간 압출의 3차원 유한요소해석 (A Three-Dimensional Finite Element Analysis of Hot Square Die Extrusion Considering the Effect of Die Bearing)

  • 강연식;양동열
    • 한국소성가공학회:학술대회논문집
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    • 한국소성가공학회 1996년도 추계학술대회논문집
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    • pp.185-191
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    • 1996
  • The Variation of die bearing is primary way to control the metal flow in hot square die extrusion process. Finite element computations are carried out to assess the influence of die bearing on metal flow and state variables. The finit element method is developed based on ALE description for a rigid-viscoplastic material. Since thermal state computational example, hot square die extrusion with varied die bearing lengths has been analyzed for the profile of a L-section.

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Al-Zn-Mg-Sc 합금의 고온압출에 미치는 공정조건의 영향 분석 (Effect of Processing Condition on the Hot Extrusion of Al-Zn-Mg-Sc Alloy)

  • 김남용;김진호;염종택;이동근;임수근;박노광;김정한
    • 소성∙가공
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    • 제15권2호
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    • pp.143-147
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    • 2006
  • Effect of processing condition on the hot extrusion of Al-Zn-Mg-Sc alloy was investigated. For this purpose, hot compression test and FE-simulation were conducted via Thermecmaster-Z and DEFORM-3D, respectively. The microstructure evolution during hot extrusion and post heat-treatment was investigated and deformation mechanisms were analyzed by constructing processing map. FE-simulation results show that the temperature difference between container and billet has considerable influence on the final shape of extruded T-shape bar. The relation between applied load and processing time was predicted by the FE-analysis as well as punch speed vs. stroke chart.

Al-Zn-Mg-Sc 합금의 고온압출에 미치는 공정조건의 영향 분석 (Effect of processing condition on the hot extrusion of Al-Zn-Mg-Sc alloy)

  • 염종택;김남용;임수근;박노광;김정한
    • 한국소성가공학회:학술대회논문집
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    • 한국소성가공학회 2005년도 추계학술대회 논문집
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    • pp.202-205
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    • 2005
  • Effect of processing condition on the hot extrusion of Al-Zn-Mg-Sc alloy was investigated. For this purpose, hot compression test and FE-simulation were conducted via Thermecmasteer-Z and DEFORM-3D, respectively. The microstructure evolution during hot extrusion and post heat-treatment was investigated and deformation mechanisms were analyzed by constructing processing map. FE-simulation results show that the temperature difference between container and billet has considerable influence on the final shape of extruded T-shape bar. The relation between applied load and processing time was predicted by the FE-analysis as well as punch speed vs. stroke chart.

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압출성 향상을 위한 고강도 7000계 알루미늄 합금의 제조 및 압출한계선도 (Manufacture of 7000 Al Alloy with Superior Extrudability and Its Extrusion Limit Diagram)

  • 함현욱;김병민;조훈;조형호
    • 소성∙가공
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    • 제8권5호
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    • pp.482-490
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    • 1999
  • 7000 series Al alloy with good mechanical properties has been focused with tendency to reduce the components weight of aircraft and automobile. However, it is difficult to manufacture a sound extruded product because of segregation, grain growth, casting defect, surface defect, decreasing extrudability and so on. The objective of this study is to manufacture a new 7000 al alloy more than the extrudability of A7N01 and A7003 through controlling the weight (%) Mg, Zn, Si. Hot extrusion experiments on the axisymmetric rod are performed in 500℃ and also performed analysis of the same process using unmerical analysis method, a coupled rigid-thermoviscoplastic finite element method. Extrusion limit diagram was obtained for the developed alloy by FE-simulation in order to define the relationship of extrusion speed and initial billet temperature.

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