Method for manufacturing at least one metal turbine engine part

Patent metadata

Field	Value
Publication number	US-10363633-B2
Application number	US-201314434252-A
Country	US
Kind code	B2
Filing date	Oct 9, 2013
Priority date	Oct 9, 2012
Publication date	Jul 30, 2019
Grant date	Jul 30, 2019

Abstract

A method of fabricating at least one metal part for a turbine engine, the method including the steps of casting a metal alloy by centrifuging into a permanent metal mold for making a blank; obtaining a cast blank of elongate shape and of section that is circular or polygonal; and machining the blank to make the part.

First claim

The invention claimed is:

1. A method of fabricating a turbine engine blade for a turbine engine, the method comprising:
a) casting a metal alloy by centrifuging into a permanent metal mold for making a blank, the permanent metal mold rotating about an axis during the casting;
b) obtaining a cast blank of elongate shape and of section that is circular or polygonal; and
c) machining the blank to make the turbine engine blade by removing material of the blank to reveal all exterior features of the turbine engine blade,
wherein the metal alloy is TiAl-based,
wherein the permanent metal mold includes a plurality of housings extending radially from the axis and being regularly spaced around the axis,
wherein the cast blank is initially in a form of a wheel including a plurality of radial blanks in which radially inner ends of the radial blanks are secured to a common central hub, and
wherein the blank obtained in step b) is tubular, with at least one turbine engine blade being machined from a thickness of a tubular wall of the blank.

2. A method according to claim 1 , wherein the metal alloy is TiAl 48-2-2.

3. A method according to claim 1 , wherein step a) comprises melting an ingot into a cooled metal crucible and pouring the metal melted into a centrifuged permanent mold.

4. A method according to claim 1 , wherein the number of turbine engine blades machined from the blank is greater than six.

5. A method according to claim 1 , wherein the blank obtained in step b) is obtained by separating the blank from the wheel having the plurality of radial blanks secured at the radially inner ends thereof to the common central hub by machining.

6. A method according to claim 1 , wherein each of the housings of the plurality of housings is cylindrical.

7. A method according to claim 1 , wherein the blank obtained in step b) is subjected to heat treatment prior to machining step c).

8. A method according to claim 7 , wherein said heat treatment includes a step of hot isostatic compression.

9. A method of fabricating a turbine engine blade for a turbine engine, the method comprising:
a) casting a metal alloy by centrifuging into a permanent metal mold for making a blank, the permanent metal mold rotating about an axis during the casting;
b) obtaining a cast blank of elongate shape and of section that is circular or polygonal; and
c) machining the blank to make the turbine engine blade by removing material of the blank to reveal all exterior features of the turbine engine blade,
wherein the metal alloy is TiAl-based,
wherein the permanent metal mold includes a plurality of housings extending radially from the axis and being regularly spaced around the axis,
wherein the cast blank is initially in a form of a wheel including a plurality of radial blanks in which radially inner ends of the radial blanks are secured to a common central hub,
wherein the turbine engine blade includes a dovetail attachment at a first end and a platform with a sealing element at a second end, and
wherein the blank obtained in step b) is tubular, with at least one turbine engine blade being machined from a thickness of a tubular wall of the blank.

10. A method according to claim 9 , wherein each of the housings of the plurality of housings is cylindrical.

Assignees

• Snecma
• Safran Aircraft Engines

Inventors

• Marcillaud Celine Jeanne
• Digard Brou De Cuissart Sebastien
• Mineur-Panigeon Marie
• Texier Anthony

Classifications

• F01D5/147

  Construction, i.e. structural features, e.g. of weight-saving hollow blades (F01D5/148, F01D5/16 and F01D5/20 take precedence; blade shape F01D5/141; blades with cooling or heating channels or cavities F01D5/18; heating, heat-insulating or cooling means on blades F01D5/18) · CPC title

• B23P15/02 Primary

  turbine or like blades from one piece · CPC title

• B22D13/02

  of elongated solid or hollow bodies, e.g. pipes, in moulds rotating around their longitudinal axis · CPC title

• Y10T29/49336

  Blade making · CPC title

• B22D25/02

  by its peculiarity of shape; of works of art {(cylinders, pistons B22D15/02)} · CPC title