Plastic and nonmetallic article shaping or treating: processes – Mechanical shaping or molding to form or reform shaped article – To produce composite – plural part or multilayered article
Reexamination Certificate
2005-11-29
2009-12-01
Johnson, Christina (Department: 1791)
Plastic and nonmetallic article shaping or treating: processes
Mechanical shaping or molding to form or reform shaped article
To produce composite, plural part or multilayered article
Reexamination Certificate
active
07625510
ABSTRACT:
Composite tooling is fabricated with low cost dry fabrics and a neat resin instead of expensive prepregs. Dry, three-dimensional woven joint preforms are placed on a dry tool substrate and dry, 3D preforms are also placed between pre-cured egg crate-like junctions. The entire tool substrate and substrate-to-support structure joints are then resin-infused simultaneously through the use of rota-molded tooling aids, providing an additional reduction in cost. Tight control of resin content and distribution with vacuum infusion is thereby provided. This process eliminates the primary cause of structural weakness and cooling distortion, which typically occur at the attachment interface when existing methods are used. The preforms provide significantly greater pull-off strengths at interfaces than do hand-laid tie plies. Issues with tool surface durability are addressed through the use of ceramic-filled face coat.
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Rosato, Dominick V.; Schott, Nick R.; Rosato, Donald V.; Rosato, Marlene G. Plastics Institute of America Plastics Engineering Manufacturing and Data Handbook. Springer—Verlag. p. 1134-1135 Online version available at: http://knovel.com/web/portal/browse/display?—EXT—KNOVEL—DISPLAY—bookid=1118&VerticalID=0.
Ashton Todd H.
Batzer Richard R.
Schmidt Ronald P.
Bracewell & Giuliani LLP
Hauth Galen
Johnson Christina
Lockheed Martin Corporation
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