# US 5,702,050 A · Method of brazing a honeycomb

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- Number: US 5,702,050 A
- Document ID: US5702050A
- Status: Granted
- Kind: A
- Application number: 08/634,697
- Filed: 1996-04-18
- Granted: 1997-12-30
- Earliest claimed: 1995-04-28
- Assignees: Mitsubishi Jukogyo Kabushiki Kaisha
- Inventors: Kiyoo Oono
- Web page: https://patentgrep.com/patent/US5702050A

## CPC

- B23K 1/0014: {Brazing of honeycomb sandwich structures}
- F01D 25/285: {Temporary support structures, e.g. for testing, assembling, installing, repairing; Assembly methods using such structures}
- B23K 2101/02: Honeycomb structures
- F05B 2250/283: Honeycomb
- F05D 2220/3216: for a special compressor stage
- F05D 2230/237: Brazing
- F05D 2240/125: related to the tip of a stator vane
- F05D 2250/283: honeycomb
- B23K: SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- F01D: NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES (machines or engines for liquids F03; non-positive displacement pumps F04D)
- F05B: INDEXING SCHEME RELATING TO WIND, SPRING, WEIGHT, INERTIA OR LIKE MOTORS, TO MACHINES OR ENGINES FOR LIQUIDS COVERED BY SUBCLASSES F03B, F03D AND F03G
- F05D: INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS

## Abstract

A method of brazing a honeycomb for air sealing onto a braze surface of the front end of the stationary blade of an axial-flow compressor in accordance with the invention includes the steps of: placing a filler sheet between the honeycomb and the braze surface; constraining the honeycomb in the seal width direction so that the seal width direction of the honeycomb corresponds to the seal width direction of the braze surface while keeping the figure of the honeycomb at the same curvature with that of the braze surface; and heating the assembly to braze the honeycomb and the braze surface.

## Claims

### Claim 1

A method of brazing a honeycomb for air sealing onto a braze surface of the front end of the blade of a rotating machine, comprising the steps:
placing a filler sheet between the honeycomb and the braze surface;
constraining the honeycomb in the seal width direction so that the seal width direction of the honeycomb corresponds to the seal width direction of the braze surface while keeping the figure of the honeycomb at the same curvature with that of the braze surface;
vertically biasing the honeycomb against the braze surface by applying a uniform pressure along the seal width direction of the braze surface and the honeycomb using a jig;
heating the assembly to braze the honeycomb and the braze surface; and
allowing the honeycomb to freely vertically heat expand by displacing a jig vertically while said jig continues to bias said honeycomb against the braze surface.

### Claim 2 (depends on 1)

The method of claim 1 including the step of allowing the honeycomb to freely heat expand in the direction transverse to the seal width direction .