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알루미늄 7075 복합압출재에 대한 공정해석 및 설계
Analysis and Design of a Forming Porcess for Combined Extrusion with Aluminum AIIoy 7075

김진복    ((주) 풍산기술연구소   ); 변상규    (부산대학교 정밀정형 및 금형가공 연구센터  );
  • 초록

    A Combined extrusion operation consists of forward and backward extrusion forming and it is possible to make the process be simple by employing it. But the metal flow pattern induced by the operation is hard to analyze accurately because the flows are non-steady, which have at least two directions dependent upon each other. So engineers in the industrial factories had conducted the two extrusion operations separately. A new process was designed by the industrial expert for forming of an alu-minum preform using the combined extrusion operation. In this study, experiments and finite element analysis was carried out to determine the process parameters. Through the preliminary experiment, it was shown that warm forming condition was more desirable than cold or hot ones. And optimal shape of initial billet could be also determined. From the compatibility test, bonde-lube was chosen as the optimal lubricant and 20 $0^{\circ}C$ as the material temperature by the inspection of micro-structure. The operation was simulated by the rigid-plastic finite element method to examine the metal flow. Disap-pearing of dead metal zone was observed as the punch fell down and desirable shape was obtained from the one operation. As a result of this study, 7 operations could be reduced and 225% of material saved.


  • 주제어

    Combined Extrusion .   Expert System .   Finite Element method .   Dead Metal Zone .   Lubricant .   Grain Growth.  

  • 참고문헌 (11)

    1. Anlaysis of Corxustence of Two Kinds of Macro-Defects in Cup-Cup Axisymmetric Combined Extrusion , Li, Miaoquan;Wu, Shichun , Chinese Journal of Aeronautics / v.3,pp.58-66,
    2. 상하컵형인 전후방압출 공정에 관한 실험적 연구 , 김영득;한철호 , 한국소성가공학회 / v.3,pp.291-301,
         
    3. Analysis of Combined Backward/ Forward Extrusion , B. Avitzur;W.C. Hahn;M. Mori , Trans. of the ASME / v.,pp.438-445,
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    5. 상계해법에 의한 축대칭 후방압출의 소성변형해석 , 한철호 , 대한기계학회지 / v.13,pp.330-336,
    6. Evaluation of Lubrication and Friction in Cold Forging using a Double Backward Extrusion Process , J.Y. Lee;T. Altan , J. of Mater. Proce. Tech. / v.33,pp.95-108,
    7. Analysis of Combined Backward/ Forward Extrusion by the Finite Element Method , A.K. Tayal , Int. Conf. on Nume. Methods in Industrial Forming Process Swans / v.,pp.247-255,
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 저자의 다른 논문

  • 변상규 (4)

    1. 1994 "유한요소법을 활용한 궤도륜의 프레스 성형공정 설계" 소성가공 = Transactions of materials processing : Journal of the Korean society for technology of plastics 3 (2): 189~201    
    2. 1995 "정밀 전자부품 성형을 위한 소성가공 공정설계" 소성가공 = Transactions of materials processing : Journal of the Korean society for technology of plastics 4 (1): 79~91    
    3. 1997 "강-소성 유한요소법의 3차원 역추적 기법을 적용한 코이닝 공정설계" 소성가공 = Transactions of materials processing : Journal of the Korean society for technology of plastics 6 (5): 408~415    
    4. 1998 "배관의 결빙에 의한 열변형 및 열응력 해석" 大韓機械學會論文集. Transactions of the Korean Society of Mechanical Engineers. A. A 22 (1): 227~237    

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