US 12,071,863 B2
Preform for a composite blade
Vivien Mickaël Courtier, Moissy-Cramayel (FR); Dominique Gerhardt Mayhew, Moissy-Cramayel (FR); Adrien Jacques Philippe Fabre, Moissy-Cramayel (FR); and Adrien Louis Nicolas Laurenceau, Moissy-Cramayel (FR)
Assigned to SAFRAN AIRCRAFT ENGINES, Paris (FR)
Appl. No. 17/753,591
Filed by SAFRAN AIRCRAFT ENGINES, Paris (FR)
PCT Filed Sep. 2, 2020, PCT No. PCT/FR2020/051523
§ 371(c)(1), (2) Date Mar. 8, 2022,
PCT Pub. No. WO2021/048484, PCT Pub. Date Mar. 18, 2021.
Claims priority of application No. 1909949 (FR), filed on Sep. 10, 2019.
Prior Publication US 2022/0333493 A1, Oct. 20, 2022
Int. Cl. F01D 5/28 (2006.01); B29C 70/02 (2006.01); B29C 70/68 (2006.01); F01D 5/14 (2006.01); B29K 105/08 (2006.01); B29K 105/16 (2006.01); B29L 31/08 (2006.01)
CPC F01D 5/282 (2013.01) [B29C 70/025 (2013.01); B29C 70/682 (2013.01); F01D 5/147 (2013.01); B29K 2105/0845 (2013.01); B29K 2105/16 (2013.01); B29K 2995/0097 (2013.01); B29L 2031/082 (2013.01); F05D 2220/36 (2013.01); F05D 2300/6012 (2013.01); F05D 2300/603 (2013.01); F05D 2300/612 (2013.01)] 11 Claims
OG exemplary drawing
 
1. A preform for a composite blade, obtained by three-dimensional weaving, comprising:
a first longitudinal section, configured to form a blade root, and
a second longitudinal section, extending from the first longitudinal section, configured to form a portion of an airfoil,
wherein the first longitudinal section has a first thickness at its upper end,
wherein the second longitudinal section includes at least one set-back zone, forming a recess in the lateral surface of the preform, having a thickness at least three times less than the first thickness, the total surface of the set-back zone occupying at least 50% of the surface of the second longitudinal section,
wherein the second longitudinal section includes a transition zone, provided between the first longitudinal section and the set-back zone, the transition zone having a thickness decreasing in the direction of the set-back zone, and
wherein the transition zone has a layer exit rate greater than 5 layer exits per 100 mm.