Rotor blade manufacture

Patent metadata

Field	Value
Publication number	US-9790798-B2
Application number	US-201514725785-A
Country	US
Kind code	B2
Filing date	May 29, 2015
Priority date	Jun 24, 2014
Publication date	Oct 17, 2017
Grant date	Oct 17, 2017

Abstract

A method is provided of processing one or more blades of a row of blades which forms part of a rotor for a gas turbine engine. The method includes: providing a rotor disc having a slot for mounting one or more blades; applying tape at one or both sides of the slot such that when the blades are loaded in the slot the tape reduces a range of tilt angles which can be adopted by the blades; loading the blades in the slot; and performing a processing operation on the loaded blades.

First claim

We claim:

1. A method of grinding tips of one or more blades of a row of blades which forms part of a rotor for a gas turbine engine, the method including:
providing a rotor disc having a slot for mounting one or more blades;
applying tape at one or both sides of the slot such that, when each of the one or more blades is loaded in the slot, the tape reduces a range of tilt angles which can be adopted by the blade;
loading the one or more blades in the slot;
performing a grinding operation on a blade tip of each of the loaded one or more blades; and
removing the tape from the disc after the grinding operation.

2. The method according to claim 1 , wherein the slot is a circumferential slot for mounting a plurality of the blades.

3. The method according to claim 1 , wherein:
the rotor disc has a plurality of axial slots for mounting respective ones of the blades,
the tape is applied at one or both sides of each slot, and
the blades are loaded in the slots.

4. The method according to claim 1 , wherein the tape reduces the range of tilt angles by at least 50%.

5. The method according to claim 1 , wherein:
each of the one or more blades has a laterally-projecting platform that extends over a rim of the disc, and
the tape reduces the clearance between each of the platforms and the rim and thereby reduces the range of tilt angles that can be adopted by the one or more blades.

6. The method according to claim 1 , wherein the tape reduces the distance across a mouth of the slot and thereby reduces the range of tilt angles that can be adopted by the one or more blades.

7. The method according to claim 1 , wherein the tape is a polymer tape.

8. The method according to claim 1 , wherein the tape has an adhesive layer for adhering to the rotor disc.

9. The method according to claim 1 , further comprising balancing each of the one or more blades before the blade is processed.

10. The method according to claim 1 , further comprising applying a protective coating to each of the loaded one or more blades to protect the blade from debris generated during the grinding operation.

Assignees

• Rolls Royce Plc

Inventors

• Raven Gemma Alexandra
• Taylor Christopher Jonathan
• May Alexander David
• Baird Andrew Alan Robert

Classifications

• F05D2230/61

  using limited numbers of standard modules which can be adapted by machining · CPC title

• F05D2230/10

  by removing material · CPC title

• F01D5/32 Primary

  Locking, e.g. by final locking blades or keys · CPC title

• F01D5/3092

  Protective layers between blade root and rotor disc surfaces, e.g. anti-friction layers (F01D5/288 takes precedence) · CPC title

• F01D5/288

  Protective coatings for blades · CPC title