B - Operations – Transporting – 29 – C
Patent
B - Operations, Transporting
29
C
B29C 70/44 (2006.01) B29D 99/00 (2010.01) B29C 33/38 (2006.01) B29C 43/36 (2006.01) B29C 70/08 (2006.01) B29D 24/00 (2006.01) B32B 3/12 (2006.01) B29C 33/40 (2006.01) B29C 33/76 (2006.01) B29D 31/00 (2006.01)
Patent
CA 2148470
2148470 9414600 PCTABScor01 A composite molding apparatus (10) and method for high pressure co-cure molding of lightweight honeycomb core composite articles having ramped surfaces utilizing low total density, stabilized ramped honeycomb cores. The low total density, stabilized ramped honeycomb core is formed by net shaping stabilized honeycomb core material into a ramped honeycomb core, which is prepped for lay-up and co-cure by applying a layer of low areal weight film adhesive to the upper, lower and ramped surfaces thereof. The honeycomb core material is stabilized for the net shaping operation by a layer of the low areal weight film adhesive applied to the upper and lower surfaces of the material in a predetermined picture frame format. The composite molding apparatus is a semi-rigid molding assembly that includes a rigid base member (12) and a complementary semi-rigid mold (20) member that includes internal rigid reinforcement inserts (22) that provide symmetric pressure distribution over the ramped surfaces of the honeycomb core and the overlaid composite prepregs during the high pressure co-cure process. Composite prepregs and the ramped honeycomb core are laid-up in the semi-rigid molding assembly, which is vacuum bagged and disposed in an autoclave. The vacuum bag is evacuated, and the laid-up molding assembly is subjected to a two stage pressure, temperature cycle for high pressure co-cure. The autoclave is pressurized to a dwell pressure, and the temperature is then raised from ambient to a dwell temperature whereupon the autoclave is stabilized for a dwell period. Next, the autoclave pressure is increased to a high pressure, and the temperature is raised to a co-cure temperature whereupon the autoclave is stabilized for a co-cure period to effect curing of the lay-up. After curing is complete, the autoclave is cooled, and then depressurized for removal of the composite molding apparatus.
Carstensen Thomas A.
Dublinski Alex C.
Ramey Philip J.
Swabey Ogilvy Renault
United Technologies Corporation
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