Removable irreversibly shrinking male mandrel

Details Removable irreversibly shrinking male mandrel Removable irreversibly shrinking male mandrel

B - Operations, Transporting

29

C

18/1205, 18/642,

B29C 33/40 (2006.01) B29C 33/52 (2006.01) B29C 61/00 (2006.01) B29C 33/44 (2006.01) B29C 33/64 (2006.01) B29C 33/76 (2006.01)

Patent

CA 1273772

Abstract of the Disclosure Removable Irreversibly Shrinking Male Mandrel 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 temperature that is above said first temperature. 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 shrinks 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.

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