DIE FORMING METALLIC SHEET MATERIALS

摘要

A process and apparatus for forming a sheet material by drawing it into a die cavity (12) utilizing the flow of a viscous thermoplastic polymer medium extruded against the sheet (22) and/or extruded out of said die cavity (12) through a plurality of passageways (14a, 14b, and 14c) and programmably varying said extrusion of said medium to cause the sheet material to be controllably stretched into the cavity and shaped.