本文目的在利用MARC有限元素軟體，分析NACA0022葉片冷鍛(Cold Forging)加工之最佳化問題，建立最佳模具曲線。 首先利用魏[23] 所得之軸對稱閉模冷間鍛造成形實驗值及上界限解，與成形負荷與速度場比對之結果，驗證MARC分析冷鍛加工問題的可靠性與妥適性。 再應用MARC有限元素分析軟體，結合最佳化軟體IMSL，建立MARC之最佳化系統，分析葉片鍛造加工問題。以不同摩擦條件，探討材料受力情形、建立最佳模具曲線，使得鍛件最後尺寸與目標葉片曲線誤差量最小。最後，針對誤差趨勢，發展出加權目標函數，改善材料因回彈所造成之局部誤差。 The purpose in this paper is that use the finite element software MARC to analyze the optimization of NACA0022 blade by cold forging processing and establish the best mold shape. First, to confirm the reliability of the finite element software MARC, we use the experiment and upper-bound method solutions of load and velocity field by Wei’s [ 23 ] cold forging in axial-symmetry close-die, to compare with those solutions of MARC. Also we union he finite element software MARC and optimal software IMSL to establish a optimal system of MARC which analyze the problem of blade in forging processing. By setting different factor of friction, we can discuss the stress of material and establish best curve of mold to get the minimum error between the final curve by forging and the goal curve of blade . Finally, in view of the erroneous tendency, we develops the cost function which has weight factor to improve the local error because of the spring back of material.
