| Summary: | 碩士 === 高苑科技大學 === 機械與自動化工程研究所 === 101 === This study uses eesy2-form finite element software to of CPM simulate company the multi-stage forging of circular bearing nut. The dimensions of forging parts can be finished by the four-stage forging and extrusion processes, the material flow needs to be considered to form the cup height. The study assumes constant shear friction to obtain the effective stress, the effective strain, the velocity field, the forming force, and the parts shape. The effect of various flow streses on the shape dimen sions, the forming force and the cup height can be explored especially. The cup height of bearing nut is the main dimension of part, so how to decrease the cup height to the least is a key point of the study. Moreover comparisons of sizes between simulation and experiment are used to verify the acceptance of FEM model. The max error is around 10%, the similarity is around 90%, and the acceptance of finite element simulation can be verified.
Moreover, from the simulation analysis the forming force in the third stage is maximun. The design of punch and die needs to be improved. Therefour combining Tauguhi use method with FEM to do the simulation, adopting four control factors：frictional factor (m), the angle of front punch (β°), the filet of front punch (R) and the small diameter of front punch (d1) varying three levels, and three optimizations are considered, such as variation of the cup hright for single goal, the forming force for single goal, and dual-goal. The affecting results can be provided as the reference of punch and dies design.
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