US 11,667,089 B2
Production in composite material of a lobed structure of a flow mixer
Gaël Bouchy, Moissy-Cramayel (FR); and Eric Philippe, Moissy-Cramayel (FR)
Assigned to SAFRAN CERAMICS, Le Haillan (FR)
Appl. No. 16/753,641
Filed by SAFRAN CERAMICS, Le Haillan (FR)
PCT Filed Sep. 28, 2018, PCT No. PCT/FR2018/052395
§ 371(c)(1), (2) Date Apr. 3, 2020,
PCT Pub. No. WO2019/068996, PCT Pub. Date Apr. 11, 2019.
Claims priority of application No. 1759244 (FR), filed on Oct. 3, 2017.
Prior Publication US 2020/0254698 A1, Aug. 13, 2020
Int. Cl. B29C 70/46 (2006.01); B29C 69/02 (2006.01); B29C 70/20 (2006.01); F02K 1/48 (2006.01); B29C 70/38 (2006.01); B29K 101/10 (2006.01); B29L 31/00 (2006.01)
CPC B29C 69/02 (2013.01) [B29C 70/205 (2013.01); B29C 70/462 (2013.01); F02K 1/48 (2013.01); B29C 70/382 (2013.01); B29K 2101/10 (2013.01); B29L 2031/7504 (2013.01); F05D 2300/604 (2013.01)] 11 Claims
OG exemplary drawing
 
1. A method for manufacturing a composite material structure for a lobed structure of a gas turbine flow mixer, said flow flowing from upstream to downstream, the lobed structure having a final geometry and comprising a multilobed skirt portion having a plurality of lobes distributed around a longitudinal axis of the lobed structure, the method comprising:
a) producing, by carrying it out on a first mold, a fibrous preform comprising one of a thermoformable resin and a thermosetting resin, in a configuration having a first geometry essentially developable by post-forming to the final geometry the composite material structure to be produced, and
b) transferring on a second mold the fibrous preform having the first geometry, and, at least by exploiting the thermoformable or thermosetting nature of the resin, post-forming the first geometry, on said second mold, by deforming it to the final geometry,
wherein the first mold has an annular upstream portion and a downstream portion which flares out from the upstream cylindrical base with no lobes to form the first geometry, the annular upstream portion having a circular section and/or a cylindrical shape, and,
wherein the second mold has an annular upstream portion corresponding to the annular upstream portion of the first mold and a downstream multilobed skirt portion corresponding to the final geometry.