US3773506A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of manufacturing a blade having a plurality of internal cooling channels
Assignee: ABB Norden Holding AB
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Filing: 1972-03-23
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Granted: 1973-11-20
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Expires: 1992-03-23
Abstract
Abstract In manufacturing blades for gas turbines with a plurality of inner cooling channels by isostatic compression, a sintering capsule of deformable material is provided with thin-walled tubes arranged substantially parallel to the capsule wall parts corresponding to the high and low pressure surfaces of the blade. A powdered material is poured into the capsule, which is then evacuated, sealed and heated to at least 800*C. Thereafter the heated capsule is subjected to an external gas pressure of at least 500 bars. Simultaneously with the compression, the tubes are subjected to such a high internal gas pressure that the linear decrease in the tube cross-section is at most 50 percent.
Inventors
- 👤 H Larker
- 👤 S Isaksson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 12:59
CPC Classifications
B; B22; B22F; B22F5/00; B22F5/04; B23; B23P; B23P15/00; B23P15/02; F; F01; F01D; F01D5/00; F01D5/12; F01D5/14; F01D5/18; F01D5/187; F01D5/28; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49316; Y10T29/49336; Y10T29/49339; Y10T29/49341
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
67 words
Method according to claim 1, which comprises arranging said tubes in at least two rows, the first row being nearest and parallel to a first capsule wall part, and a second row nearest and parallel to a second capsule wall part, said first wall part corresponding to the high pressure side and said second wall part to the low pressure side of the blade to be manufactured.
Claim 2
Dependent Claim
23 words
Method according to claim 2, in which the total tube cross-section of said first row is greater than that of said second row.
Claim 3
Dependent Claim
34 words
Method according to claim 1, in which said tubes are formed as branches on a thicker tube communicating with them which is arranged with at least one end at a wall of the capsule.
Claim 4
Dependent Claim
59 words
Method According to claim 1, in which the step of subjecting the tubes to said internal gas pressure comprises introducing into a tube at a relatively low temperature a substance which at least at the sintering temperature emits vapour, and sealing the ends of the tube whereby, the tube is heated at the same time as the sintering material.
Claim 5
Dependent Claim
42 words
Method according to claim 5, in which said substance is a solid substance which at the necessary sintering temperature has a vapor pressure which is greater than 60 percent of the maximum gas pressure applied on the outside of the sintering capsule.
Claim 6
Dependent Claim
16 words
Method according to claim 5, in which said substance is gaseous at 20*C and 1 bar.
Claim 7
Dependent Claim
16 words
Method according to claim 7, in which said substance is liquid when inserted in the tube.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-11-19 | 1977-05-21 | 1977-11-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-11-19 | 1981-05-21 | 1981-11-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-11-19 | 1985-05-21 | 1985-11-20 | $7700.00 | Window Closed / Lapsed |