Piece made of composite material with areas of different thickness

1. A piece ( 1 ) manufactured from a stack of composite material fabrics comprising at least two adjacent areas ( 11 , 15 ) of different thickness and a transition area ( 13 ) between both, characterized in that the transition area ( 13 ) is configured with a single slope ( 17 ) and in that the stack structure, from the inner face to the outer face of the piece ( 1 ), comprises:

a first section formed by at least two continuous fabrics ( 21 , 21 ′) extending along the three mentioned areas ( 11 , 13 , 15 );

a second section formed by one or more symmetrical and balanced fabric packets ( 23 ) placed among one or more continuous fabrics ( 25 ) extending along the three mentioned areas ( 11 , 13 , 15 ), said fabric packets ( 23 ) extending along the thickest area ( 11 ) and ending in the transition area ( 13 ) such that the latter has a continuous slope ( 17 );

a third section formed by a symmetrical and balanced fabric packet ( 27 ) extending along the three mentioned areas ( 11 , 13 , 15 ) placed among one or more continuous fabrics ( 25 ) extending along the three mentioned areas ( 11 , 13 , 15 );

a fourth section formed by at least two continuous fabrics ( 29 , 29 ′) extending along the three mentioned areas ( 11 , 13 , 15 ).

2. A piece ( 1 ) according to claim 1 , characterized in that the fabric packet ( 27 ) of the third section is configured with a final slope ( 31 ) in the transition area forming a section of the slope ( 17 ) of the transition area ( 13 ).

3. A piece ( 1 ) according to claim 2 , characterized in that the configuration of the fabric packet ( 27 ) of the third section also includes an inner slope ( 31 ′) in the transition area ( 13 ).

4. A piece ( 1 ) according to claim 2 , characterized in that the jump in thickness corresponding to each of said slopes ( 31 , 31 ′) is less than or equal to 2 mm.

5. A piece ( 1 ) according to claim 1 , characterized by having a final C-shaped profile and being manufactured from a planar laminate by means of a heat-forming process.

6. A piece ( 1 ) according to claim 5 , characterized by being an aircraft wing spar with an area of great thickness.

7. A piece ( 1 ) according to claim 3 , characterized in that the jump in thickness corresponding to each of said slopes ( 31 , 31 ′) is less than or equal to 2 mm.

8. A piece ( 1 ) according to claim 2 , characterized by having a final C-shaped profile and being manufactured from a planar laminate by means of a heat-forming process.

9. A piece ( 1 ) according to claim 3 , characterized by having a final C-shaped profile and being manufactured from a planar laminate by means of a heat-forming process.

10. A piece ( 1 ) according to claim 4 , characterized by having a final C-shaped profile and being manufactured from a planar laminate by means of a heat-forming process.

11. A piece ( 1 ) according to claim 7 , characterized by having a final C-shaped profile and being manufactured from a planar laminate by means of a heat-forming process.

12. A piece ( 1 ) according to claim 8 , characterized by being an aircraft wing spar with an area of great thickness.

13. A piece ( 1 ) according to claim 9 , characterized by being an aircraft wing spar with an area of great thickness.

14. A piece ( 1 ) according to claim 10 , characterized by being an aircraft wing spar with an area of great thickness.

15. A piece ( 1 ) according to claim 11 , characterized by being an aircraft wing spar with an area of great thickness.