Method of making an airfoil

• US 4,583,274 A
• Filed: 09/20/1984
• Issued: 04/22/1986
• Est. Priority Date: 03/01/1982
• Status: Expired due to Fees

• Current Assignee: Ex-Cell-O Corporation
• Original Assignee: TRW Inc. (Northrop Grumman Corporation)
• Inventors: Moracz, Donald J., Cook, Charles R., Toth, Istvan J.
• Primary Examiner(s): Goldberg, Howard N.
• Assistant Examiner(s): Wallace, Ronald S.
• Application Number:
  US06/652,759
• Time in Patent Office: 579 Days
• Field of Search: 29/DIG. 16, 29/156.8 B, 29/156.8 H, 29/156.8 T, 29/423, 29/463, 29/469, 29/557, 228/182, 228/190, 228/191, 228/193, 228/243, 416/229 R, 416/232, 416/233
• US Class Current: 29/889.71
• CPC Class Codes: B23P 15/04 turbine or like blades from several pieces
• CPC Class Codes: Y10T 29/49337 Composite blade
• CPC Class Codes: Y10T 29/4981 Utilizing transitory attached element or associated separate material
• CPC Class Codes: Y10T 29/49893 Peripheral joining of opposed mirror image parts to form a hollow body
• CPC Class Codes: Y10T 29/49904 Assembling a subassembly, then assembling with a second subassembly

Abstract

An improved method of making an airfoil includes stacking plies in two groups. A separator ply is positioned between the two groups of plies. The groups of plies and the separator ply are interconnected to form an airfoil blank. The airfoil blank is shaped, by forging or other methods, to have a desired configuration. The material of the separator ply is then dissolved or otherwise removed from between the two sections of the airfoil blank to provide access to the interior of the airfoil blank. Material is removed from inner sides of the two separated sections to form core receiving cavities. After cores have been placed in the cavities, the two sections of the airfoil blank are interconnected and the shaping of the airfoil is completed. The cores are subsequently removed from the completed airfoil.

Claims

1. A method of making an airfoil, said method comprising the steps of forming an airfoil blank having first and second major side surfaces extending between leading and trailing edge portions of the airfoil blank, dividing the airfoil blank into a plurality of separate sections which include first and second sections with the first major side surface on the first section and the second major side surface on the second section, removing material from the first section to form a cavity in the first section, placing a core in the cavity, interconnecting the first and second sections with the core disposed in the cavity in engagement with the first and second sections, shaping the first and second sections with the core between them, and thereafter removing the core from the cavity while first and second sections are interconnected.

2. A method as set forth in claim 1 wherein said step of forming an airfoil blank includes the steps of providing first and second groups of plies, interconnecting the two groups of plies, and deforming the two groups of plies.

3. A method as set forth in claim 1 wherein said step of forming an airfoil blank includes the step of providing a separator section in the airfoil blank at a location between the major side surfaces of the airfoil blank, said step of dividing the airfoil blank into a plurality of sections including the steps of separating the separator section from portions of the airfoil blank on opposite sides of the separator section to form the first and second sections of the airfoil blank.

4. A method as set forth in claim 3 wherein said step of separating the separator section from portions of the airfoil blank includes the step of dissolving the separator section.

5. A method as set forth in claim 1 wherein said step of removing the core from the cavity includes the step of dissolving the core.