Manufacturing method for trumpet spar and other curved objects
First Claim
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1. A method for producing an object of composite material, the method comprising:
- providing a curved molding tool having a curved spar rib surface forming corners at opposite sides thereof with a concave flange surface and a convex flange surface, each corner having a curvature matching that of the spar rib surface, and the concave and convex flange surfaces each having a curvature matching that of its respective corner with the spar rib surface;
forming a fiber stack of a plurality of fiber prepregs over the spar rib surface so that the fiber stack folds over each of said corners, wherein no fiber directions of the fiber stack are parallel with curvature of the molding tool, and wherein all fibers of the fiber stack cross each of said corners only once;
downforming the fiber stack by activation of a vacuum bag applying pressure causing the fiber stack to conform to the molding tool; and
curing the downformed fiber stack.
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Abstract
A method for producing an object of composite material comprising the steps of:
- placing one or several prepregs on a plane surface, forming a fiber stack;
- lifting over the fiber stack to a molding tool;
- downforming the fiber stack;
- curing the downformed fiber stack;
where the method also comprises the step of: - orienting the fiber directions so that all fibers, when the fiber stack is lifted over to the molding tool, will cross an edge of the molding tool only once.
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13 Claims
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1. A method for producing an object of composite material, the method comprising:
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providing a curved molding tool having a curved spar rib surface forming corners at opposite sides thereof with a concave flange surface and a convex flange surface, each corner having a curvature matching that of the spar rib surface, and the concave and convex flange surfaces each having a curvature matching that of its respective corner with the spar rib surface; forming a fiber stack of a plurality of fiber prepregs over the spar rib surface so that the fiber stack folds over each of said corners, wherein no fiber directions of the fiber stack are parallel with curvature of the molding tool, and wherein all fibers of the fiber stack cross each of said corners only once; downforming the fiber stack by activation of a vacuum bag applying pressure causing the fiber stack to conform to the molding tool; and curing the downformed fiber stack. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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Specification