| Summary: | 碩士 === 國立成功大學 === 機械工程學系碩博士班 === 94 === 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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