| Summary: | 碩士 === 高苑科技大學 === 機械與自動化工程研究所 === 100 === The study uses Deform 3D FEM analysis software to simulate the new product
development, and propose the analysis of various possible forming plans. This study
carries out the realistic cylinder compression to obtain the flow stress, and performes
really the ring compression to get the frictional factors between the dies and forged
materials in forming to simulate with. Deform 3D FEM analysis software. And the
tension test of rod has been carried out to obtain the critical damage value (CDV)
combining with Cockcroft & Latham and Normalized Cockcroft & Latham damage
ctcriteria. The optimization of parameters assembly has been obtained by Taguchi
method with orthgonal table L9(34) to adjust the shapes and dimensions of punch and
die, and do the confirmation simulation analysis to obtain the optimal parameters
assembly. The realistic multi-stage forging has been performed to realize the
effective stress, the effective strain, the velocity field and the multi-stage forging force
and.compare the product dimensions with the simulation results to verify the
acceptance of FEM analysis model. The similarity has been reached over 95%.
Furthermore, the tungsten steel materials made from the power metallurgy are difficult
to bear the circumferential tensile stress which easy to cause the mold kernel fracture.
Therefore, with a view to understanding the die stress distributions, especially explore
the radial stress, circumferential stress and the effective stress of mold kernel, mold
form and stress ring occurred by single mold form interference fit and stress ring
interference fit. The effect of the interference on the circumferential stress has been
understood, and aslo whether the effective stress occurred exceeds the allowable yield
strength of die material to avoid the die failure. The study proposes a series of
simulation investigations and experiment verifications as the forging industry
reference.
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