US3707750A
Expired / Lapsed
US
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Method for manufacturing a turbine blade
Assignee: MTU Aero Engines AG
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Filing: 1969-11-13
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Granted: 1973-01-02
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Expires: 1989-11-13
Abstract
Abstract A method for manufacturing a turbine blade in which a sheet metal strip, corresponding in its dimensions to the developed blade, is provided with cooling passages, thereafter a thinner sheet metal strip is attached to the sheet metal strip provided with the grooves by welding or brazing to form a blade wall, and thereafter the blade wall is placed about a tool core and is deformed into the shape of the blade whereupon the ends of the strips are connected with each other by brazing or welding to form the trailing edge of the blade.
Inventors
- 👤 G Klass
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 07:46
CPC Classifications
F; F01; F01D; F01D5/00; F01D5/12; F01D5/14; F01D5/18; F01D5/187; F01D5/188; F01D5/189; B; B23; B23P; B23P15/00; B23P15/04; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49316; Y10T29/49336; Y10T29/49339; Y10T29/49341
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
189 words
A method for the manufacture of a turbine blade which is constructed hollow on the inside for the purpose of cooling the blade walls thereof by means of a cooling medium and which is provided with cooling passages, supplied with cooling medium that is discharged by way of aperture means located near the trailing edge of the blade, characterized by the steps of, at first, preparing a sheet metal strip corresponding to the developed blade to serve as blade wall, thereafter working grooves into the sheet metal strip, attaching a further, thinner sheet metal strip to the side of the first-mentioned sheet metal strip provided with the grooves by brazing or welding to form cooling passages between the two strips, placing the blade wall consisting of the assembled first-mentioned strip and the further metal strip about a tool core to produce the desired blade profile in such a manner that the two ends of the blade wall abut against one another to form the trailing edge of the blade, and connecting said two ends of the blade wall with each other within the area of the abutting ends thereof.
Claim 2
Independent Claim
189 words
A method for the manufacture of a turbine blade which is constructed hollow on the inside for the purpose of cooling the blade walls thereof by means of a cooling medium and which is provided with cooling passages, supplied with cooling medium that is discharged by way of aperture means located near the trailing edge of the blade, characterized by the steps of, at first, preparing a sheet metal strip corresponding to the developed blade to serve as blade wall, thereafter working grooves into the sheet metal strip, attaching a further, thinner sheet metal strip to the side of the first-mentioned sheet metal strip provided with the grooves by brazing or welding to form cooling passages between the two strips, placing the blade wall consisting of the assembled first-mentioned strip and the further metal strip about a tool core to produce the desired blade profile in such a manner that the two ends of the blade wall abut against one another to form the trailing edge of the blade, and connecting said two ends of the blade wall with each other within the area of the abutting ends thereof.
Claim 3
Dependent Claim
14 words
A method according to claim 1, wherein the turbine blade is a guide blade.
Claim 4
Dependent Claim
14 words
A method according to claim 1, wherein the grooves extend in the axial direction.
Claim 5
Dependent Claim
14 words
A method according to claim 1, wherein the grooves extend in the radial direction.
Claim 6
Dependent Claim
21 words
A method according to claim 1, characterized in that the cooling medium is supplied to the cooling passages from the outside.
Claim 7
Dependent Claim
27 words
A method according to claim 1, characterized in that the cooling medium is supplied to the cooling passages by way of the hollow space of the blade.
Claim 8
Dependent Claim
21 words
A method according to claim 1, characterized in that several aperture means are formed at the trailing edge of the blade.
Claim 9
Dependent Claim
24 words
A method according to claim 1, characterized in that the further sheet metal strip is of substantially the same size as the first-mentioned strip.
Claim 10
Dependent Claim
29 words
A method according to claim 1, characterized in that the ends of the blade wall forming the blade trailing edge are connected with each other by brazing or welding.
Claim 11
Dependent Claim
56 words
A method according to claim 1, characterized in that the further thinner sheet metal strip, prior to its connection with the first-mentioned sheet metal strip provided with the grooves, is provided already with bores which enable the cooling air supply from the interior hollow space of the blade to the cooling passages formed by the grooves.
Claim 12
Dependent Claim
80 words
A method according to claim 1, characterized in that the further, thinner sheet metal strip is shorter than the first-mentioned sheet metal strip provided with the grooves so that with the use of radial grooves worked into the blade wall and after completed deformation of both strips, the ends of the further thinner sheet metal strip terminate in front of at least one cooling passage formed by the grooves of the blade wall and are connected thereat with each other.
Claim 13
Dependent Claim
119 words
A method according to claim 1, characterized in that with the use of grooves worked into the first-mentioned sheet metal strip in the axial direction, these grooves extend only over sections of this strip and are so arranged one above the other that after completed deformation of this strip corresponding to the desired blade contour, these grooves are disposed within the area of at least one of the two edges consisting of leading and trailing edge of the blade, and in that thin sheet metal strips, in lengths according to the axial extent of the grooves, are attached to the sections provided with the grooves of the first-mentioned sheet metal strip for the purpose of forming the cooling passages.
Claim 14
Dependent Claim
80 words
A method according to claim 12, characterized in that the further, thinner sheet metal strip is shorter than the first-mentioned sheet metal strip provided with the grooves so that with the use of radial grooves worked into the blade wall and after completed deformation of both strips, the ends of the further thinner sheet metal strip terminate in front of at least one cooling passage foRmed by the grooves of the blade wall and are connected thereat with each other.
Claim 15
Dependent Claim
93 words
A method according to claim 1, characterized in that at least one further, shorter sheet metal strip serving to cover the grooves arranged section-wise in the first-mentioned sheet metal strip of the blade wall is so attached to said first-mentioned sheet metal strip by means of upwardly bent ends of said shorter strip which extend approximately parallel to the two lateral edges of the first-mentioned sheet metal strip, that after completed deformation, the upwardly bend ends of a shorter sheet metal strip overlap, whereupon the overlapping ends are securely connected with each other.
Claim 16
Dependent Claim
123 words
A method according to claim 1, characterized in that with the use of grooves extending either in the radial or axial direction, the further, thinner sheet metal strip, serving to cover the grooves, is shorter than the first-mentioned sheet metal strip by such an amount that after completed deformation of both strips corresponding to the desired blade contour, one or more of the grooves within the area of the blade trailing edge will form one or more of the cooling passages provided with bores or slots which, for purposes of discharging the cooling air out of the cooling passages by way of the blade trailing edge, are worked into the blade wall simultaneously with the grooves prior to deformation of the blade wall.
Claim 17
Dependent Claim
56 words
A method according to claim 1, characterized in that the further, thinner sheet metal strip, prior to its connection with the first-mentioned sheet metal strip provided with the grooves, is provided already with bores which enable the cooling air supply from the interior hollow space of the blade to the cooling passages formed by the grooves.
Claim 18
Dependent Claim
44 words
A method according to claim 1, wherein said grooves are so located in the sheet metal strip and said thinner sheet metal strip is of such size that both of the opposing surfaces of the finished turbine blades are accessible to the cooling medium.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-01-02 | 1976-07-03 | 1977-01-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-01-02 | 1980-07-03 | 1981-01-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-01-02 | 1984-07-03 | 1985-01-02 | $7700.00 | Window Closed / Lapsed |