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논문 상세정보

알루미늄 7075 복합압출재에 대한 공정해석 및 설계

Analysis and Design of a Forming Porcess for Combined Extrusion with Aluminum AIIoy 7075


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.

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참고문헌 (11)

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  6. 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, 1990
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  8. 상하컵형인 전후방압출 공정에 관한 실험적 연구 , 김영득;한철호 , 한국소성가공학회 / v.3,pp.291-301, 1994
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