Publication Details

H. Sato, K. Manabe, D. Wei & Z. Jiang, "Numerical modeling of size effect in micro hydromechanical deep drawing," in AIP Conference Proceedings (1567): The 9th International Conference and Workshop on Numerical Simulation of 3D Sheet Metal Forming Processes, 2014, pp. 926-929.


A modeling of tribological size effects in micro deep drawing (MDD) and micro hydromechanical deep drawing (MHDD) is a main focus in this study. The inner and outer pockets in which the different friction coefficients can be applied at different lubrication conditions are considered on the blank surface. The ratio of the area of outer pockets to inner pockets is changed with the decrease in the size. The low friction coefficient at the outer pockets is assumed in MHDD by considering the lubrication effect of fluid medium. The numerical analysis is performed under six lubrication conditions. The analytical results of punch force-stroke curves are in good agreement with the experimental values. The friction force decreases in MHDD with the decrease in the size although it increases in MDD. The friction coefficient at die shoulder significantly influences the friction force due to high contact pressure in MHDD.



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