US 12,251,917 B2
Method for manufacturing an acoustic panel
Aurélia Clerambourg, Moissy-Cramayel (FR); Eric Bouillon, Moissy-Cramayel (FR); and Eric Philippe, Moissy-Cramayel (FR)
Assigned to SAFRAN CERAMICS, Le Haillan (FR)
Appl. No. 17/260,006
Filed by SAFRAN CERAMICS, Le Haillan (FR)
PCT Filed Jul. 16, 2019, PCT No. PCT/FR2019/051782
§ 371(c)(1), (2) Date Jan. 13, 2021,
PCT Pub. No. WO2020/016520, PCT Pub. Date Jan. 23, 2020.
Claims priority of application No. 1856607 (FR), filed on Jul. 17, 2018.
Prior Publication US 2021/0323295 A1, Oct. 21, 2021
Int. Cl. B32B 37/14 (2006.01); B29C 45/16 (2006.01); B29C 51/00 (2006.01); B29C 65/00 (2006.01); B32B 3/12 (2006.01); B32B 5/02 (2006.01); B32B 7/12 (2006.01); C04B 35/01 (2006.01); C04B 35/117 (2006.01); C04B 35/18 (2006.01); C04B 35/80 (2006.01); G10K 11/168 (2006.01); G10K 11/172 (2006.01)
CPC B32B 37/146 (2013.01) [B32B 3/12 (2013.01); B32B 5/02 (2013.01); B32B 7/12 (2013.01); C04B 35/117 (2013.01); C04B 35/18 (2013.01); C04B 35/80 (2013.01); G10K 11/168 (2013.01); G10K 11/172 (2013.01); B29C 2045/1692 (2013.01); B29C 51/00 (2013.01); B29C 66/72525 (2013.01); B29C 66/7461 (2013.01); B32B 2307/102 (2013.01); B32B 2307/518 (2013.01); B32B 2605/18 (2013.01); C04B 35/01 (2013.01)] 9 Claims
OG exemplary drawing
 
1. A process for manufacturing a composite panel, comprising:
obtaining a first wall, a second wall, a third wall and a fourth wall each formed of composite materials comprising an oxide matrix and long oxide fibers, the long oxide fibers being several kilometers long;
from the first and second walls, forming a honeycomb core having a plurality of cells, each cell having a first end and an opposite second end, the forming comprising:
forming the first wall so as to obtain a corrugated wall having alternating first and second apex portions interconnected by apex connecting portions; and
cutting slots in said first apex portions and in said apex connecting portions of the first wall;
making cuts in the second wall so as to obtain a plurality of strips; and
inserting said strips into the slots of the first wall so as to delimit the plurality of cells, wherein the slots are cut in a substantially axial direction and opening in a direction normal to the corrugated wall; and
covering said first and second ends of the cells of said honeycomb core with said third wall and said fourth wall, respectively, so as to close the ends of said cells.