Abstract
Channels with concavo-convex shape within metal sheets were formed using rubber forming process. Metal sheet on which channel is formed can be implemented as a bipolar plate in the fuel cell. The effects of important parameters in rubber forming such as hardness and thickness of rubber pad, speed and pressure of punch that compress blank, and physical property of materials on the channel depth were analyzed. In the soft material sheet Al1050, deeper channels are formed than in materials SS304 and Ti-G5. Formed channel depth was increased when hardness of rubber pad was lower, thickness of rubber pad was high, and speed and pressure of punch were high. It was found the deepest channel was achieved when forming process condition was set with punch speed and pressure at 30mm/s and 55 MPs, respectively using rubber pad having hardness Shore A 20 and thickness 60mm. The channel depths of bipolar plates formed with Al1050, SS304 and Ti-G5 under the above process condition were 0.453, 0.307, and 0.270mm, respectively.
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