Method of manufacturing composite aircraft structures
A method of making a wing for an aerospace vehicle includes forming a frame member defining opposing perpendicular legs being spaced by an interconnecting member. A plurality of ribs is interconnected along the frame member at spaced locations forming an internal wing structure. Each of the ribs define an upper rib surface and a lower rib surface. A composite upper skin and lower skin are formed as a continuous sheet by way of a pultrusion process defining a shape that is complimentary to the plurality of ribs. The upper skin is secured to the upper surface defined by the plurality of ribs and the lower skin is secured to the lower surface of the plurality of ribs forming the aerospace wing.
1. A method of manufacturing a wing for an aerospace vehicle, comprising the steps of:
forming a frame member by a pultrusion process, said frame member including a perpendicular cross-section defining opposing substantially vertical legs being spaced by an interconnecting member;
interconnecting a plurality of ribs along said frame member at spaced locations thereby forming an internal wing structure, each of said ribs defining an upper rib surface and a lower rib surface;
forming a composite upper skin and composite lower skin by one of a pultrusion process, resin transfer molding and ply layup process defining a complementary shape to said plurality of ribs; and
securing said upper skin to said upper surface of said plurality of ribs and securing said lower skin to said lower surface of said plurality of ribs thereby forming said wing.
2. The method of making a wing assembly set forth in claim 1 , wherein said step of forming said frame member is further defined by forming cooperable frame channel portions each comprising a C-shaped cross-section defining an abutting channel bases and opposing channel legs each extending outwardly from said channel base for defining said vertical legs of said frame member thereby forming an I-beam cross-section.
3. The method of making a wing assembly set forth in claim 2 , wherein said step of providing cooperable channel portion is defined by forming said channel portions via a pultrusion process.
4. The method of making a wing assembly set forth in claim 2 , further including a step of adhering said channel bases of each opposing channel portions with adhesive thereby forming said frame member.
5. The method of making a wing assembly set forth in claim 2 , further including a step of riveting said channel bases of each opposing channel portion thereby forming said frame member.
6. The method of making a wing assembly set forth in claim 1 , further including a step of forming receptors in opposing distal ends of said legs at spaced locations for receiving said ribs thereby interconnecting said ribs to said elongate member.
7. The method of making a wing assembly set forth in claim 6 , wherein said step of forming receptors in opposing distal ends of said legs is further defined by mounting said elongate member onto a fixture and machining said receptors into said distal ends of said legs.
8. The method of making a wing assembly set forth in claim 7 , wherein said receptors each define a datum for receiving one of said ribs thereby establishing one of a net or near net assembly.
9. The method of making said wing assembly set forth in claim 6 , wherein said step of interconnecting said ribs to said elongate member is further defined by adhering with an adhesive said rib to said frame member.
10. The method of making said wing assembly set forth in claim 1 , wherein said step of securing said upper skin to said upper surface of said plurality of ribs and securing said lower skin to said lower surface of said plurality of ribs is further defined by adhering said upper skin to said upper surface of each of said plurality of ribs with an adhesive and adhering said lower skin to said lower surface of said plurality of ribs with said adhesive.
11. The method of making said wing assembly set forth in claim 1 , wherein said step of securing said upper skin to said upper surface of said upper ribs and securing said lower skin to said lower surface of said plurality of ribs is further defined by enjoining said skins to said ribs by at least one of an adhesive, a threaded fastener and a rivet.
12. The method of making said wing assembly set forth in claim 1 , further including the step of forming said plurality of ribs with injection molded fiber reinforced plastic.
13. The method of making said wing assembly set forth in claim 12 , further including the step of molding a fastener into said ribs thereby securing said fastener to said rib.
14. The method of making said wing assembly set forth in claim 13 , wherein said step of molding said fastener into said ribs is further defined by molding a nut into one of said upper and said lower rib for receiving a threaded stud through an aperture of said mating rib thereby securing said upper rib to said lower rib.
15. The method of making said wing assembly set forth in claim 1 , wherein said step of securing said upper skin to said upper surface of said plurality of ribs and securing said lower skin to said lower surface of said plurality of ribs thereby forming said wing is further defined by drilling mounting holes in flange defined by said ribs with net fixture drill equipment thereby forming mounting holes in said ribs being parallel and perpendicular for receiving fasteners.
16. The method of making said wing assembly set forth in claim 15 , further including a step of drilling apertures in said skins being aligned with said mounting holes defined by said flange of said ribs.
17. The method of making said wing assembly set forth in claim 1 , wherein said apertures defined by said skins and corresponding of said mounting holes defined by said flange of said ribs receive a rivet for securing said skins to said frame member.
18. The method of making said wing assembly set forth in claim 1 , wherein said steps of mating said frame member with said plurality of ribs is further defined by aligning said ribs in parallel.