Tool for simultaneous local stress relief of each of a multiple of linear friction welds of a rotor forging

Patent metadata

Field	Value
Publication number	US-11448227-B2
Application number	US-202117189770-A
Country	US
Kind code	B2
Filing date	Mar 2, 2021
Priority date	Jan 5, 2018
Publication date	Sep 20, 2022
Grant date	Sep 20, 2022

Abstract

A tool for simultaneous local stress relief of each of a multiple of linear friction welds includes a columnar track defined along an axis, the columnar track having a helical slot; and a support structure engaged with the helical slot to translate and rotate a heat treat fixture portion along the axis.

First claim

What is claimed is:

1. A method for heat treating a rotor hub, the method comprising:
enclosing a predetermined area around a linear friction weld of an airfoil on each of a multiple of stubs of a stub-containing rotor hub forging with an upper heat treat fixture portion and a lower heat treat fixture portion by moving the upper heat treat fixture portion and the lower heat treat fixture portion toward each other along an axis of the rotor hub until the predetermined area is enclosed by a combination of the upper heat treat fixture portion and the lower heat treat fixture portion; and
concurrently stress relieving the linear friction welds with the upper heat treat fixture portion and the lower heat treat fixture portion within the predetermined area while ensuring that an inner diameter of the rotor hub does not exceed a predetermined temperature wherein the upper heat treat fixture portion and the lower heat treat fixture portion move along a columnar track defined along the axis, the columnar track having a through-wall helical slot; and wherein a support structure is engaged with the helical slot to translate and rotate the upper and the lower heat treat fixture portions along the axis, the support structure comprises a collar assembly with a carrier that rides along an outer surface of the columnar track and a connecting arm that extends from the carrier through the through-wall helical slot.

2. The method as recited in claim 1 , wherein enclosing the predetermined area comprises rotating and translating the upper heat treat fixture portion and the lower heat treat fixture portion.

3. The method as recited in claim 1 , wherein concurrently stress relieving comprises individually controlling a desired radiant heat around each linear friction weld.

4. The method as recited in claim 1 , wherein concurrently stress relieving comprises maintaining the predetermined area at the predetermined temperature for a predetermined time period.

5. The method as recited in claim 4 , further comprising individually controlling a desired radiant heat around each of the multiple of airfoil shaped openings.

6. The method as recited in claim 1 , wherein the upper heat treat fixture portion and the lower heat treat fixture portion each contain a multiple of heaters that produce a desired radiant heat around each of a multiple of airfoil shaped openings that define the predetermined area adjacent to each of the multiple of linear friction welds.

7. The method as recited in claim 6 , wherein the multiple of heaters are controlled by a control system in response to a temperature measurement by at least one thermocouple associated with each of the multiple of linear friction welds.

8. The method as recited in claim 7 , wherein radiant heat around each of the multiple of airfoil shaped openings is individually controlled.

9. The method as recited in claim 1 , wherein the upper heat treat fixture portion and the lower heat treat fixture portion are manufactured of ceramic to support a multiple of heaters and a multiple of thermocouples.

Assignees

• Raytheon Tech Corp

Inventors

• Bales Daniel A
• Haynes Andrew L
• Rettberg Luke H

Classifications

• C21D9/0068

  for particular articles not mentioned below · CPC title

• C22F1/10

  of nickel or cobalt or alloys based thereon · CPC title

• F02K3/06

  with front fan · CPC title

• B23P15/006 Primary

  turbine wheels · CPC title

• C21D9/0006

  Details, accessories not peculiar to any of the following furnaces (control devices C21D11/00) · CPC title