	US 12,076,947 B2
	Stiffened panel of composite materials and method for the manufacture of said panel
Miguel Ruiz Dealbert, Villarreal (ES); Juan Salamero Laorden, Villarreal (ES); Roberto Estal Vera, Villarreal (ES); and Maria del Mar Cuetos Gómez, Villarreal (ES)
Assigned to MUELLES Y BALLESTAS HISPANO-ALEMANAS PROJECTS, S.L., Villarreal (ES)
Appl. No. 17/432,400
Filed by MUELLES Y BALLESTAS HISPANO-ALEMANAS PROJECTS, S.L., Villarreal (ES)
PCT Filed Feb. 18, 2020, PCT No. PCT/ES2020/070115 § 371(c)(1), (2) Date Aug. 19, 2021, PCT Pub. No. WO2020/169865, PCT Pub. Date Aug. 27, 2020.
Claims priority of application No. 19382117 (EP), filed on Feb. 19, 2019.
Prior Publication US 2022/0184903 A1, Jun. 16, 2022
Int. Cl. B29C 70/70 (2006.01); B29C 70/48 (2006.01); E04C 2/16 (2006.01); E04C 2/38 (2006.01); B29K 105/08 (2006.01)

CPC B29C 70/70 (2013.01) [B29C 70/48 (2013.01); E04C 2/16 (2013.01); E04C 2/38 (2013.01); B29K 2105/0863 (2013.01); B29K 2105/0872 (2013.01)]

10 Claims

1. A method for manufacturing a stiffened panel of composite materials, comprising:

a skin in laminar form that comprises an inner face and an outer face, and

stiffeners located on the inner face of said skin and situated in longitudinal and transverse directions thereto,

wherein the manufacturing method includes the following steps:

providing a skin,

making a plurality of through drill holes on the skin located in correspondence with areas where the placement of stiffeners is expected,

introducing threaded bolts in the through drill holes, wherein the threaded bolts comprise a body and a head, such that the head of the threaded bolt remains housed in the skin,

after the introduction of the bolts through the skin, locating a threaded nut on a free end of the threaded bolts opposite the head, and

once the bolts have been introduced into the skin, manufacturing the stiffeners on the inner face of the skin by stacking on top of the inner face of the skin a plurality of layers of composite material, such that the threaded bolts and the threaded nut remain embedded within the stiffeners.