抽製為常被用於棒材、線材或管材等的斷面縮減製程。當針對特殊合金抽製時，傳統錐形模可能因負荷過大，造成模具失效或胚料破裂等缺陷。本文以耐熱合金鋼SUH35抽線製程為探討對象，以Bezier曲線為模具曲線方程式，並配合上界限法，由總消耗功率最小化決定模具曲線以得到眼模最佳化的幾何設計。同時藉由有限元素套裝軟體DEFORM-3D進行細部模擬分析，以獲得成形負荷、胚料之等效應力及殘留應力、眼模應力及溫度分佈等，並進一步探討摩擦係數、成形速度以及製程溫度對於抽線負荷的影響，並討論臨界成形斷面縮減率下使用最佳化曲線模的優點。
從上界限法計算可得知曲線模之消耗功率較錐形模為小。以有限元素法模擬最佳化曲線模與錐形模之抽製，從所獲得之負荷、胚料等效應力、胚料殘留應力模具溫度與模具應力，顯示出本文所設計之最佳化曲線模有較佳之性能。

Drawing process is usually used in the area reduction of bars, wires and tubes. While the drawing process is used for special alloy, the die or the billet are susceptible to failure because the conventional conical die might undergo high drawing load. The wire drawing of the heat resistant steel SUH35 is investigated in this thesis. Bezier curve is used for die profile design and analyzed by upper bound method (UB). According to minimum power dissipation, the optimal design of die profile is obtained. Through the FEM analysis with commercial package of DEFORM-3D, the forming load, effective stress, residual stress, the distribution of stress and temperature on the wire drawing die were attained. Furthermore, the drawing load influenced by the constant shear friction factor, forming speed, and temperature during the process are studied. In addition, the advantage of using optimal curved dies at the critical area reduction is discussed.
The power dissipation of optimal curve die calculated from the upper bound method is smaller than that of conical die in the same process condition. Using FEM simulation for wire drawing with optimal curved die and conical die, the drawing load, effective stress of the billet, residual stress of the billet, die temperature and die stress were obtained. It showed that the optimal curved dies designed in the thesis have better performance than conical dies for various area reductions.

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