US4762464A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Airfoil with diffused cooling holes and method and apparatus for making the same
Assignee: Chromalloy Gas Turbine Corp
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Filing: 1986-11-13
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Granted: 1988-08-09
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Expires: 2006-11-13
Abstract
Abstract Air cooling of airfoils in a gas-turbine engine is effected through holes which terminate with a diffuser formation at the airfoil surface. The invention is directed to a two-step procedure whereby a laser beam drills the holes very quickly and cost-effectively and whereby an EDM step is relied upon only to form the diffuser shape. The EDM part of the procedure thus occupies but a fraction of the time previously required, and substantial overall economy is realized by integrating these two steps, which are preferably performed in the order stated but which, if desired, may alternatively be performed by laser driling after EDM formation of the diffuser shape.
Inventors
- 👤 Richard J. Vertz
- 👤 Reza K. Mosavi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 00:13
CPC Classifications
F; F01; F01D; F01D5/00; F01D5/12; F01D5/14; F01D5/18; F01D5/186; B; B23; B23H; B23H1/00; B23H1/04; B23H9/00; B23H9/10; B23K; B23K26/00; B23K26/36; B23K26/38; B23K26/382; B23K26/384; B23P; B23P15/00; B23P15/02; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49316; Y10T29/49336; Y10T29/49339; Y10T29/49341
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
61 words
A body shell for a gas-turbine airfoil and having one or more cooling holes between an inner surface and an outer surface, each of said one or more holes having a laser-drilled inner bore portion and an EDM-machined outer diffuser portion, whereby the inner bore portion has a surface roughness which substantially exceeds the surface roughness of the outer diffuser portion.
Claim 2
Dependent Claim
61 words
A body shell for a gas-turbine airfoil and having one or more cooling holes between an inner surface and an outer surface, each of said one or more holes having a laser-drilled inner bore portion and an EDM-machined outer diffuser portion, whereby the inner bore portion has a surface roughness which substantially exceeds the surface roughness of the outer diffuser portion.
Claim 3
Dependent Claim
34 words
An airfoil body shell according to claim 1, wherein the axial extent of said inner bore position is at least one half the space between geometrical intercepts of the bore axis with said surfaces.
Claim 4
Dependent Claim
62 words
A body shell for a gas-turbine airfoil and having one or more cooling holes between an inner surface and an outer surface, each of said one or more holes having an inner bore portion and an outer diffuser portion, said inner bore portion being the product of a laser-drilling process and said outer diffuser portion being the product of electric-discharge (EDM) machining.
Claim 5
Dependent Claim
62 words
A body shell for a gas-turbine airfoil and having one or more cooling holes between an inner surface and an outer surface, each of said one or more holes having an inner bore portion and an outer diffuser portion, said inner bore portion being the product of a laser-drilling process and said outer diffuser portion being the product of electric-discharge (EDM) machining.
Claim 6
Dependent Claim
34 words
An airfoil body shell according to claim 3, wherein the axial extent of said inner bore portion is at least one half the span between geometrical intercepts of the bore axis with said surfaces.
References Cited (Backward Citations)
US3538289A
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US3981786A
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US4197443A
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US4650949A
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US4653983A
Cited
US4664597A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-08-09 | 1992-02-08 | 1992-08-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-08-09 | 1996-02-08 | 1996-08-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-08-09 | 2000-02-08 | 2000-08-09 | $7700.00 | Window Closed / Lapsed |