Abstract
Abstract A typical coining process as a microscopic closed die forging is experimentally and numerically analyzed. The designed surface microgeometry to be formed on the blank is uniformly distributed surface microprojections of 175 μm diameter and 28 μm height at the pitch of 260 μm. The evolution of the microbulging and filling behavior in the die microcavities are experimentally analyzed. The independence of the formation of surface microgeometry on the bulk plastic flow is observed. The delayed bulk metal flow subsequent to microforming yields shearing off of the surface microprojections. The average contact pressure is compared with calculation of the upper bound modeling. The possibility of separate analyses of local-micro and global-macro deformation and the integration is suggested.
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