Plastic and nonmetallic article shaping or treating: processes – Direct application of fluid pressure differential to... – Producing multilayer work or article
Patent
1990-12-03
1994-11-29
Woo, Jay H.
Plastic and nonmetallic article shaping or treating: processes
Direct application of fluid pressure differential to...
Producing multilayer work or article
264258, 264313, 264314, 425388, 425389, B29C 4302, B29C 4320, B29C 4356
Patent
active
053688074
ABSTRACT:
A method for fabricating fiber reinforced resin matrix composite structures having molded outside surfaces with intermittent molded inside surfaces (e.g. an aircraft skin with internal stiffeners) is performed as follows: composite prepreg stiffener sections are preformed and laid up on the inside portion of the rigid portion of the vacuum bag and the lay-up debulked. Elastomeric tubes are then installed in rigid cavity portions of a hybrid vacuum bag and sealing wedges are forced into place to hold the elastomeric tubes and at the same time seal them to the rigid portion of the cavity. The elastomeric tubes extend through and protrude from the sealing wedges. Skin plies are then laid up on a primary mold and the hybrid bag installed on the mold. Index pins are provided to properly orient the hybrid bag to the primary mold or tool. A vacuum is then drawn on the bag, any vacuum leaks are remedied, and the part is ready for curing in either an oven or an autoclave. After curing, the sealing wedges are removed and a vacuum is drawn on the elastomeric tubes to collapse them for easy removal. After removal of the elastomeric tubes and the hybrid bag the completed structural part is removed from the primary tool.
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Cone Gregory A.
Davis Robert B.
McDonnell Douglas Corporation
Scholl John P.
Stout Donald E.
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