Method for manufacturing constituents of a hollow blade by rolling
View Patent ↗In a method for manufacturing a hollow blade for a turbomachine, the blade is made from a preform derived from external primary parts. Each primary part comprising a root part is formed by flattening a blank cut out from a ring with a large diameter provided with a protuberance, in order to reduce costs.
1. A method for manufacturing a primary part for a hollow blade for a turbomachine, comprising:
manufacturing a ring by form rolling;
cutting a blank of the primary part from said ring, said ring having a tubular wall with an initial thickness between two ends, by cutting the tubular wall between the two ends, the blank thus being cut from a wall segment between two end parts and its thickness being the initial thickness.
2. A method according to claim 1 , wherein the ring includes a protuberance at least one end.
3. A method according to claim 1 , comprising cutting out the wall segment in its thickness between its two end portions to obtain the blank.
4. A method according to claim 3 , wherein the ring includes a protuberance at least one end.
5. A method for manufacturing a hollow blade for a turbomachine comprising a root and an airfoil, said method comprising:
a step for making at least two external primary parts using the method according to claim 1 ; and
a diffusion bonding step for welding the two primary external parts to make a blade preform, the blade preform comprising an airfoil part and a root part.
6. A method according to claim 5 , wherein the diffusion bonding assembly step of the two external parts is followed by inflation by applying gas pressure and superplastic forming of said preform.
7. A method according to claim 6 , further comprising manufacturing a third primary support part, the preform being composed of two external primary parts surrounding the primary support part.
8. A method according to claim 5 , wherein the ring includes a protuberance at least one end.
9. A method according to claim 8 , wherein the step for making the primary parts comprises the cut-out of the wall segment in its thickness between its two end portions.
10. A method according to claim 1 , wherein said cutting comprises cutting said ring so as to obtain a plurality of blanks of primary arts for the hollow blade.
11. A method for manufacturing a primary part for a hollow blade for a turbomachine, said method comprising:
cutting a blank of the primary part from a ring, said ring having a tubular wall with an initial thickness between two ends, by cutting the tubular wall between the two ends, the blank thus being cut from a wall segment between two end parts and it's thickness being the initial thickness, and
flattening of the blank or the wall segment.
12. A method according to claim 11 , comprising obtaining a cut-out of the wall segment in its thickness between its two end portions.
13. A method according to claim 12 , comprising obtaining a plurality of cut-outs of the wall segment in its thickness between its two end portions.