Hollow fan blade for turbine engine and method of manufacturing such a blade

Abstract

The invention relates to a method of manufacturing a single-piece hollow fan blade for turbine engines comprising a foot ( 2 ) extended by a rotor blade ( 4 ) in a radial direction, the method comprising the following stages: making via forging of a single-piece fan blade ( 1 ) with a plurality of inserts; and eliminating of the inserts so as to obtain a plurality of recesses ( 16 ) in this blade. The invention also relates to such a blade ( 1 ) fitted with a plurality of recesses ( 16 ) each extending substantially and radially along a curved central line ( 18 ).

1 . Method of manufacturing a single-piece hollow fan blade for turbine engines comprising a foot extended by a rotor blade in a radial direction, characterised in that it comprises the following stages: 
 making via forging of a single-piece fan blade with a plurality of inserts; and    eliminating of inserts so as to obtain a plurality of recesses in said blade.    
   
   
       2 . Method of manufacturing set forth in  claim 1 , characterised in that the production stage via forging of the single-piece blade fitted with a plurality of inserts is carried out so that the obtained recesses, following the elimination stage of the inserts, each extend substantially and radially along a curved central line.  
   
   
       3 . Method of manufacturing set forth in claims  1  or  2 , characterised in that the production stage via forging of the single-piece hollow fan blade fitted with a plurality of inserts is carried out from a supply element equipped with said plurality of inserts.  
   
   
       4 . Method of manufacturing set forth in  claim 1  or  2 , characterised in that the production stage via forging of the single-piece hollow fan blade fitted with a plurality of inserts is carried out via the implementing of the following stages: 
 prior forging of a standard supply element    installing of said plurality of inserts in the previously forged standard supply element    forging of the previously forged standard supply element and fitted with said plurality of inserts, so as to obtain said single-piece fan blade fitted with a plurality of inserts.    
   
   
       5 . Method of manufacturing set forth in  claim 1 , characterised in that the elimination stage of said inserts is carried out via solvolysis of these inserts.  
   
   
       6 . Method of manufacturing set forth in  claim 1 , characterised in that each insert is made in a material taken from among the group constituted of steels, minerals and composites.  
   
   
       7 . Method of manufacturing set forth in  claim 1 , characterised in that the initial form of said inserts is indifferently cylindrical or non-cylindrical.  
   
   
       8 . Method of manufacturing set forth in  claim 1 , characterised in that the elimination stage of said inserts is followed by a finishing stage of said blade.  
   
   
       9 . Single-piece hollow fan blade for a turbine engine comprising a foot extended by a rotor blade in a radial direction, said blade being fitted with a plurality of recesses each extending substantially and radially along a central line, characterised in that each central line is a curved line.  
   
   
       10 . Blade set forth in  claim 9 , characterised in that at least one recess is made so as to radially and entirely pass through said blade.  
   
   
       11 . Blade set forth in  claim 9 , characterised in that at least one recess is made so as to radially pass through said blade only partially.  
   
   
       12 . Blade set forth in  claim 9 , characterised in that at least one recess is of non-constant section along said central line.  
   
   
       13 . Blade set forth in  claim 9 , characterised in that it is made in titanium or one of its alloys.