Removable irreversibly shrinking male mandrel

Details Removable irreversibly shrinking male mandrel Removable irreversibly shrinking male mandrel

1986-04-28

1987-07-21

Hart, Charles

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

264221, 264313, 264317, 249 62, 249115, 249178, B29C 108

Patent

active

046817247

ABSTRACT:
A shrinkable foam mandrel that can be easily removed and composite resin transfer molding process that uses the foam mandrel. The foam is dimensionally stable at a first temperature that typically corresponds to the cure temperature of the composite resin. The foam is capable of irreversibly shrinking to less than about 0.5 said foam's original size at a second tempertaure that is above said first tempertaure. The foam is encapsulated by a non-stick elastomer skin and covered with fibers. The fiber covered elastomer encapsulated foam is disposed in a female mold cavity and resin is injected into the female mold cavity. The resin and fibers are cured and the resulting composite component is removed from the female mold. The temperature is raised to the second temperature and the elastomer encapsulated foam male mandrel irreversibly shrink to less than about 0.5 its original size. Finally the shrunken male mandrel is removed from said composite component. These mandrels are a solution to the aerospace industry's flyaway mandrel problem as they are lightweight and can easily be removed from the composite component.

REFERENCES:
patent: 3882220 (1975-05-01), Ryder
patent: 4067949 (1978-01-01), Karabedian
patent: 4095322 (1978-06-01), Scarpati et al.
patent: 4316701 (1982-02-01), Scarpati et al.
patent: 4464324 (1984-08-01), Hagher
patent: 4566923 (1986-01-01), Mueller

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