D6AC合金薄管旋壓成型模擬與實驗之可拓分析

D6AC的超高強度及優異機械性質已成為航太科技工業主要的應用材料，並廣泛應用在太空、大氣層內之飛行器及核能工業等高科技產品上。隨著航太科技工業需求性能的不斷提升，傳統的製造技術已不符效益。因此，世界各國均致力於開發更精良、更快速及高效率之製程，期能將材料特性進一步掌握與發揮。本研究目的為探討D6AC超高強度合金鋼在旋型加工、熱處理後材料對機械性質所產生的變化，獲得完整且最適化的關鍵製程技術，提供國防與航太科技工業發展的主要依循。本文利用ANSYS/LS-DYNA有限元素數值模擬分析D6AC超高強度低合金鋼之成型性，針對單道次順流旋型探討在不同壁厚減縮率下成型應力、應變與旋壓力之分佈規律。將個案之減縮率、主軸轉速、進給率、輥輪攻角尺寸初步結果進行實驗，再經由可拓法的二次特徵變換，終能獲得最佳的成形工件，最終工件強度約可達產品規格1.4倍，因70%的壁厚減縮率，工件重量約可降低30%，材料延伸率仍有10%，本次實驗結果，可作為提供旋壓製程之重要的參考依據。

關鍵字

旋壓；有限元素分析； D6AC

並列摘要

With its high strength and outstanding mechanical properties, D6AC alloy has become a major applied material in aerospace technology industry, and widely been applied to high-tech products on nuclear industry and aerospace vehicles. Along with continuing performance requirements in aerospace technology industry, traditional manufacturing technology is no longer satisfied with efficacy. Therefore, many countries are engaged in developing more superior, faster and higher efficient processing, and also expected to master and exert material properties further. The study is aimed to explore the mechanical properties of D6AC super strength alloy steel after spinning and heat treating, so as to obtain a complete and optimal key processing and to provide primitive principle for the development of defense and aerospace industries. In the study, the ANSYS/LS-DYNA finite element analysis method is adopted to simulate and analyze the forming properties of D6AC super strength alloy steel and it will focus on single forward spinning under various wall shrinkage rates in order to explore forming stress, strain and spinning force distribution rules. By conducting the experiment results with shrinkage rate, mandrel rotation rate, forward feeding rate, roller forward angle, and further doing the extension analysis feature transformation, the optimal process parameters can be acquired. The finial strength of work piece can be as 1.4 times as the product requirement. The weight of work piece is reduced about 30% because of the 70% shrinkage rate in thickness, but the mater elongation rate remains at 10%.The experiment results can be provided as an important reference for spinning forming processing.

並列關鍵字

Spinning ； Finite Element Method ； D6AC

參考文獻

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[3] Chang, T. L., Tsay, L. W. and Chen, C., “Influence of Gaseous Hydrogen on the Notched Tensile Strength of D6AC Steel,” Materials Science and Engineering, Vol. A316, pp. 153-160, (2001).

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D6AC合金薄管旋壓成型模擬與實驗之可拓分析

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