Die forming metallic sheet materials
First Claim
Patent Images
1. The method of die forming metallic sheet materials comprising the steps of:
- A. providing a die provided with a cavity and at least one exit port and said cavity filled with a viscous thermoplastic polymer;
B. providing means for withdrawing said polymer from said cavity through said exit port;
C. providing means to fix a metallic sheet in engagement with said die and enclosing said cavity;
D. controllably withdrawing said polymer from said cavity while applying pressure to said sheet on the face opposite said cavity until said sheet is conformed to the shape of said die.
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Accused Products
Abstract
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.
24 Citations
7 Claims
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1. The method of die forming metallic sheet materials comprising the steps of:
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A. providing a die provided with a cavity and at least one exit port and said cavity filled with a viscous thermoplastic polymer; B. providing means for withdrawing said polymer from said cavity through said exit port; C. providing means to fix a metallic sheet in engagement with said die and enclosing said cavity; D. controllably withdrawing said polymer from said cavity while applying pressure to said sheet on the face opposite said cavity until said sheet is conformed to the shape of said die. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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Specification