Turbomachine blade, in particular a fan blade, and its method of manufacture
First Claim
1. A preform of yarns or fibers woven in three dimensions and a binder maintaining the relative disposition between the yarns of the preform, said preform being made up of warp yarns and of weft yarns, the direction of the warp yarns forming the longitudinal direction of the preform, wherein said preform comprises at least a first portion made with a first weave and forming the airfoil of the blade, and a second portion made using a second weave and forming the root of the blade, and wherein the first portion and the second portion are united by a transition zone in which the first weave is progressively modified to end up with the second weave, thereby obtaining a reduction at least in the thickness of the blade between the second portion and the first portion.
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Accused Products
Abstract
The composite turbomachine blade of the present invention comprises a preform made of yarns or fibers woven in three dimensions and a binder maintaining the relative disposition between the yarns of the preform. Said preform is made up of warp yarns and of weft yarns, the direction of the warp yarns forming the longitudinal direction of the preform. In characteristic manner, said preform comprises at least a first portion made using a first weave forming the airfoil of the blade, and a second portion made using a second weave forming the root of the blade, and the first and second portions are united by a transition zone in which the first weave is progressively modified to end up with the second weave, thereby obtaining a reduction at least in the thickness of the blade between the second portion and the first portion. The invention is applicable to making a fan blade for a turbojet.
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Citations
20 Claims
- 1. A preform of yarns or fibers woven in three dimensions and a binder maintaining the relative disposition between the yarns of the preform, said preform being made up of warp yarns and of weft yarns, the direction of the warp yarns forming the longitudinal direction of the preform, wherein said preform comprises at least a first portion made with a first weave and forming the airfoil of the blade, and a second portion made using a second weave and forming the root of the blade, and wherein the first portion and the second portion are united by a transition zone in which the first weave is progressively modified to end up with the second weave, thereby obtaining a reduction at least in the thickness of the blade between the second portion and the first portion.
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15. A method of manufacturing a turbomachine blade, the method comprising the following steps:
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weaving warp yarns and weft yarns so as to form a preform of yarns or fibers that is woven in three dimensions, being made up of warp yarns and weft yarns, the direction of the warp yarns forming the longitudinal direction of the preform, said preform including at least a first portion made with a first weave and a second portion made with a second weave, said first portion and said second portion being united by a transition zone in which the first weave is progressively modified to end up with the second weave, thereby obtaining a reduction at least in the thickness of the blade between the second portion and the first portion;
cutting said preform to the shape and dimensions of the component portions of the blade;
providing a mold in which said preform is placed;
injecting a binder into said mold in order to impregnate the entire preform, the binder comprising a thermosetting resin;
heating said mold; and
extracting a molded part from the mold.
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Specification