Ceramic matrix composite rotor blade attachment and method of manufacture therefor

US11143040B2 · kind B2 · utility

Assignee

• RAYTHEON TECHNOLOGIES CORPORATION · US

Inventors

• Michael G. McCaffrey · Windsor, US
• Karl A. Mentz · Town of East Hartford, US
• Christopher R. King · Bristol, US
• Stephen Doll · Big Arm, US
• Aurelia Ledbetter · Woodstock, US

Key dates

• Filing date: Oct 2, 2019
• Grant date: Oct 12, 2021
• Expiry date: Dec 5, 2039

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y02T50/60
• WIPO field: Engines, pumps, turbines
• WIPO sector: Mechanical engineering

Abstract

A process for manufacturing a composite rotor blade includes manufacturing an oversized root region of a root region of a composite rotor blade; fixturing the CMC blade into a machining fixture at a primary Y and Z axis datum located at an attachment fillet radii of the root region; machining V-notches into the oversized root region to form a Y′ and Z′ axis datum of a sacrificial datum system in relation to the primary Y and Z axis datum; applying an oversized coating layer over the attachment fillet radii of the root region; fixturing the CMC blade into a machining fixture at the Y′ and Z′ axis datum of the sacrificial datum system; machining the oversized coating layer to a machined coating layer forming a Y″ and Z″ axis datum with respect to the Y′ and Z′ axis datum of the sacrificial datum system; fixturing the CMC blade into a machining fixture at the Y″ and Z″ axis datum; and machining off the sacrificial datum system removing the V-notches.