# US 11,077,494 B2 · Method and casting core for forming a landing for welding a baffle inserted in an airfoil

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- Number: US 11,077,494 B2
- Document ID: US11077494B2
- Status: Granted
- Kind: B2
- Application number: 15/223,861
- Filed: 2016-07-29
- Published: 2016-11-17
- Granted: 2021-08-03
- Earliest claimed: 2010-12-30
- Assignees: Raytheon Technologies Corporation
- Applicants: United Technologies Corporation
- Inventors: Tracy A. Propheter-Hinckley
- Web page: https://patentgrep.com/patent/US11077494B2

## CPC

- B22D 25/02: by its peculiarity of shape; of works of art {(cylinders, pistons B22D15/02)}
- B22C 1/00: Compositions of refractory mould or core materials; Grain structures thereof (refractory materials in general C04B35/00); Chemical or physical features in the formation or manufacture of moulds
- B22C 9/04: Use of lost patterns
- B22C 9/10: Cores; Manufacture or installation of cores {(breaker cores B22C9/084)}
- B22C 9/103: {Multipart cores}
- B22C 9/108: {Installation of cores}
- B22C 9/18: Finishing
- B22C 9/24: for hollow articles
- B22D 29/001: {Removing cores}
- F01D 5/188: {with an insert in the blade cavity to guide the cooling fluid, e.g. forming a separation wall}
- F01D 5/189: {the insert having a tubular cross-section, e.g. airfoil shape}
- F01D 9/041: {using blades (F01D5/148 takes precedence)}
- F01D 25/12: Cooling
- F05D 2230/211: by precision casting, e.g. microfusing or investment casting
- F05D 2230/232: by welding
- F05D 2240/12: Fluid guiding means, e.g. vanes
- F05D 2240/126: Baffles or ribs
- F05D 2240/30: Characteristics of rotor blades, i.e. of any element transforming dynamic fluid energy to or from rotational energy and being attached to a rotor
- F05D 2260/201: by impingement of a fluid
- F05D 2300/13: Refractory metals, i.e. Ti, V, Cr, Zr, Nb, Mo, Hf, Ta, W
- Y02T 50/60: Efficient propulsion technologies, e.g. for aircraft
- B22D: CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES (shaping of plastics or substances in a plastic state B29C; metallurgical processing, selection of substances to be added to metal C21, C22)
- B22C: FOUNDRY MOULDING (moulding refractory materials in general B28B)
- F01D: NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES (machines or engines for liquids F03; non-positive displacement pumps F04D)
- F05D: INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
- Y02T: CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION

## Abstract

A method and casting core for forming a landing for welding a baffle inserted into an airfoil are disclosed, wherein the baffle landing of the blade or vane is formed in investment casting by the casting core rather than by wax, reducing tolerances and variability in the location of the baffle inserted into the cooling cavity of airfoil when the baffle is welded to the baffle landing.

## Claims

### Claim 1

A casting core for forming a first landing for welding a first baffle inserted into a cooling cavity of an airfoil, said casting core comprising:
a first landing portion in the shape of the first landing, the first landing portion including a laterally-extending first step portion being configured to mold the first landing as a spanwise-facing surface of the airfoil relative to an airfoil span direction onto which a first baffle is welded providing a spanwise locating surface for the first baffle, the first portion disposed at one of an outer platform end or an inner platform end, the outer platform end and the inner platform end disposed at opposing longitudinal ends of the casting core; and
a cooling cavity portion extending longitudinally between the outer platform end and the inner platform end;
the first landing portion extending substantially perpendicularly laterally from the cooling cavity portion;
wherein the surface on which the first baffle is welded extends laterally outwardly from the cooling cavity portion.

### Claim 2 (depends on 1)

The casting core of claim 1, further comprising a second landing portion in the shape of a second landing for welding a second baffle inserted into the cooling cavity, the second portion disposed at the other of the outer platform end and the inner platform end of the casting core, the second landing portion including a laterally-extending second step portion being configured to mold the second landing as a spanwise-facing surface.

### Claim 3 (depends on 1)

The casting core of claim 1, wherein the casting core is a ceramic polymer.

### Claim 4 (depends on 1)

The casting core of claim 1, wherein the casting core is a refractory metal core.