US 11,717,880 B2
Method for forming a wax model for a turbine blade
Ramzi Bohli, Moissy-Cramayel (FR); Mirna Bechelany, Moissy-Cramayel (FR); Didier Dangeul, Moissy-Cramayel (FR); Didier Maurice Marceau Guerche, Moissy-Cramayel (FR); Alain Armel Le Hegarat, Moissy-Cramayel (FR); and Ngadia Taha Niane, Moissy-Cramayel (FR)
Assigned to SAFRAN, Paris (FR)
Appl. No. 17/596,122
Filed by SAFRAN, Paris (FR)
PCT Filed Jun. 3, 2020, PCT No. PCT/HR2020/050942
§ 371(c)(1), (2) Date Dec. 3, 2021,
PCT Pub. No. WO2020/245539, PCT Pub. Date Dec. 10, 2020.
Claims priority of application No. 1905967 (FR), filed on Jun. 5, 2019.
Prior Publication US 2022/0314304 A1, Oct. 6, 2022
Int. Cl. B22C 7/02 (2006.01); B33Y 80/00 (2015.01)
CPC B22C 7/02 (2013.01) [B33Y 80/00 (2014.12)] 7 Claims
OG exemplary drawing
 
1. A method for forming a wax model for the manufacture of turbine blades by lost-wax casting, wherein
a core is provided, defining ducts extending between a root and a tip,
a lower surface shell and an upper surface shell are provided,
the lower surface shell and the upper surface shell are positioned on either side of the ducts of the core adjacent to the root,
the lower surface shell and the upper surface shell are bonded around the core,
the core equipped with the lower surface shell and with the upper surface shell is positioned in an injection mold,
wax is injected around said core equipped with the lower surface shell and with the upper surface shell, so as to form a wax model comprising a blade airfoil and a blade root comprising a fir tree, the lower surface shell and the upper surface shell being positioned around the core so as to form a portion of the fir tree of the wax model.