1994 Volume 80 Issue 11 Pages 843-848
The possibility was fundamentally investigated, that the demand to light weight DWI can could be satisfied by bake-hardenable and thin gauge tinplate which had excellent DWI formability at the stage of DWI forming before baking and had high pressure resistance after baking due to such bake-hardenability as automotive steel sheets.
At first, change of mechanical property of continuous annealed tinplate with controlled amount of solute carbon due to forming was experimentally investigated by simulating DWI forming by cold rolling. Such tinplate showed increase of yield strength due to bake-hardening following cold rolling corresponding to bottom forming, and that was expected to improve dome pressure resistance. At the same time, since tensile strength of bake-hardenable tinplate cold rolled up to 70% was not higher than that of conventional tinplate, DWI formability of bake-hardenable tinplate was expected to be equivalent to that of conventional one.
Then model cans were experimentally manufactured from 2 types of tinplate, and the improvement of dome pressure resistance in bake-hardenable tinplate was proved.
Finally it was discussed that dome was fully reinforced by structural design and that the burst of dome was considered a kind of plastic collapse.
