Patent Application
20100135779
The invention concerns a semi-finished product for producing a repaired vane for a gas turbine as well as a procedure for the repair of a vane of a gas turbine.
A repair procedure for gas turbine components, namely damaged vane blades of turbine machines, is already known from the German patent DE 43 27 189 A1.
According to the repair procedure proposed there which is provided for the top and edge area of damaged vane blades, damaged areas of turbine machines are cut off down to an undamaged vane blade stub and finally the repair surface of the vane blade stub is prepared for stub welding. Then a repair plate of constant thickness exceeding maximum profile depth of the vane by somewhat more than 50% is tack-welded at the repair surface to an end stub fitted to the repair surface. After that, the vane blade stub and the repair plate are then welded by butt welding. Finally, the root gap and the repair plate are worked to the profile contour of the vane blade stub and to the desired vane blade profile. An embodiment of the procedure disclosed there is described in detail with the aid of
A disadvantage of the design known from DE 43 27 189 A1 is that standardization measures are at least in this case made considerably more difficult, so that expensive jigs for aligning the vane blade stub to the repair part as well as with a high number of expensive tack welds should be dispensed with.
Against this background, the task of the invention is to create an opportunity for repairing vanes for gas turbines, by enabling the vane remnant and the repair part to be positioned in a relatively simple manner, reproducibly if necessary, and as correctly as possible with respect to one another without this requiring jigs, which are technologically particularly expensive.
According to the invention, a semi-finished product in particular is proposed for producing a repaired vane for a gas turbine according to selected claims. A repair procedure according to the invention is the object of other claims. Preferred teachings are the object of the subclaims.
Also, in particular, a semi-finished product is proposed for producing a repaired vane for a gas turbine which exhibits a first part as well as a second part. At the same time, the first part is firmly attached to the second part, preferably welded, to be precise. The vane can, for example, be a turbine vane or a compressor vane. It can also be provided that the vane is a vane of a bladed integral rotor, such as a BLISK (a technical term derived from “bladed disk”) or a BLING (a technical term derived from “bladed ring”).
The firm attachment between the first part and the second part is preferably in the area of the floor of the recess or at the base of the groove and/or in the area of the groove sidewall.
It can be provided that the first part is a vane stub or a remnant vane or a remnant vane blade and that the second part is a repair part provided with dimensioning. In the aforementioned cases, the repair part is in particular such that it completes the vane stub or the remnant vane or the vane blade-stub or blade-remnant to a vane blade or a vane, if the allowance is left out of consideration. But it can also be provided that several repair parts are provided which in combination present the function of completion in the aforementioned sense.
It is provided that the first part exhibits or forms at least one recess, into which the second part projects. The recess can, for example, be a groove. In a more preferable embodiment, the recess or the groove is provided in the vane stub or in the remnant vane. In a recess provided as a groove, it can in particular be provided that this is tapered, widening in the direction of the base of the groove, especially tapering to a point. But it may also be that, at the base of the groove, the groove presents a cross-section that remains constant.
According to an especially preferred embodiment, it is intended that a recess in the first or in the second part, be provided, in particular a groove, into which the other part respectively projects, that is, into which the other part respectively extends, whereby the first part and the second part are welded to one another at the base of the groove and/or in the area of the groove sidewall or inside this groove or recess. The groove can thus, for example, be designed or shaped in an aforementioned manner. Hence especially preferred welding occurs from the outside, particularly, to be precise, so that the power is supplied from one direction which is convenient, at an angle to a perpendicular or to at least one of the perpendiculars occurring at the base of the groove, whereby it is particularly provided that the welding is done or occurs in the area of the base of the groove and/or in the area of the groove sidewall.
Furthermore, a procedure is proposed for the repair of a vane of a gas turbine. With this, the vane can, however, be a compressor vane or a turbine vane or a vane of a bladed integral rotor such as a BLISK or a BLING. Here the gas turbine is, in an advantageous embodiment, also a flight propulsion mechanism.
According to the procedure, it is provided that a first part, such as a vane remnant or vane stub or remnant vane or remnant vane blade or integral rotor with a vane blade section removed, is applied, and a recess, such as a groove, for instance, is introduced into this. Furthermore, a second part, such as a repair part, is applied in parallel either simultaneously or overlapping either before or after the aforementioned step. It is to be noted that it can be alternatively provided that the first part is such a part as was mentioned as an example for the second part, and the second part is such a part as was mentioned as an example for the first part.
In the procedure according to the invention, it is provided that the second part is inserted into the first part such that the second part or at least a section of this part projects into the recess or the groove. This can be so that the second part comes in contact with the base of the recess or the base of the groove, or so that, especially at least before attaching the first and the second parts, there is a gap free of material between the base of the recess or the base of the groove and the section of the second part projecting into the groove.
Furthermore, according to the procedure, it is provided that the first part is attached to the second part. This attachment can, for instance, be a weld, such as, for instance, a plasma-arc weld or TIG weld or laser-jet weld or electron-beam weld. The attachment in question occurs in particular so that after the attachment or after the attachment process, the first part is connected irremovably to the second part.
In a preferred design, it is provided that the vane stub or the remnant vane or the remnant vane blade or the bladed integral rotor, such as a BLISK or a BLING, is produced with a cut-off part of the vane blade by cutting off at least one, in particular a damaged, section of a vane to be repaired or from one of the vane blades to be repaired.
In a preferred embodiment, the repair part exhibits an oversized amount, which, after attaching to the other part, that is, in particular, a remnant vane or a remnant vane stub or a remnant integral rotor, especially a remnant BLISK or remnant BLING, is shaped to a cut-off section of a vane blade as to its form. This can in particular occur so that the shape thus produced is such that the repair part is fitted to the target contour or the shape is essentially given to the repair part which the cut-off section had, especially as derived from the damaged section.
An especially preferred weld occurs from the outside, to be precise, particularly so that power is supplied from one direction, which is convenient, at a angle to a perpendicular or to at least one of the perpendiculars occurring at the base of the groove, whereby it is in particular provided that the welding is done or occurs in the area of the base of the groove and/or in the area of the groove sidewall.
In the following, embodiment examples of the invention will now be clarified using the figures enclosed, in which it is noted that the invention shall not be limited by these embodiments, but further embodiments also fall under the invention. Shown for this are:
In
The following designs refer to both the design according to
The semi-finished product 1 exhibits a first part 10 and a second part 12, which are partially depicted.
The second part 12 corresponds to a remnant vane or to a remnant vane blade which can also be, if necessary, a component of a BLISK (derived from the technical term “BLaded dISK”).
A section of the first part 10 then forms a repair part for a vane. This is, in particular, such that a damaged area has already been cut out of a vane in advance, which will be filled by an undamaged area essentially identical in shape, so that the undamaged vane being created essentially preserves its original configuration.
In
In other words, the first part 10 is a repair part, whereby this repair part exhibits through an oversized amount and after removal of this oversized amount is standardized so that it is indicated by the first section 14.
For simplification, in the following, a repair part is addressed which exhibits an oversized amount. As is readily discernible in
The design according to
While the width of the groove in the design according to
The second part 12 is inserted into the groove being addressed, in the design according to
These welds occur in particular so that the power supply is brought from one direction, which is at an angle to the direction of groove depth. Such a direction is indicated, as an example, by the arrow 22.
The welding can thus be formed, for example, as TIG welds or laser-jet welds or electron-beam welds or plasma-arc welds.
The welding thus occurs in particular so that in the area of the base of the groove 20 and in the area of the sidewall 21 stretching from the base of the groove to the opening cross-section of the groove, the second part 12 is attached to the first part 10.
In the example procedure according to the invention, in order to bring about the repair of a gas-turbine vane, the first part 10 is first applied in which a recess, namely the groove 18, is introduced into this first part. The second part 12 is then applied. It is noted that the application of the first part 10 and of the second part 12 can be reversed. It can be further provided that a damaged area is removed from the second part 12, that is, this step is likewise a component of an example procedure.
The second part 12 is inserted into the first part 10 such that the second part or a section of the second part 12 projects into the recess or into the groove 18. This is in particular so that the second part 12 comes in contact with the first part 10 in the area of the base of the groove 20. Naturally, affixing of the first part 10 corresponds to the aforementioned insertion for the second part 12.
Finally, the second part 12 is attached to the first part 10, which in this example in particular occurs by welding. The attachment occurs such that the second part 12 is irremovably connected to the first part 10. The second part 12 is, in particular, a remnant vane blade, while the first part 10 is a repair part.
As is readily discernible in the figures, the repair part exhibits an oversized amount. This oversized amount is ultimately removed, in a preferred procedure according to the invention which can occur, for example, by shaving or by laser cutting.
It is in particular provided that a groove is introduced at the front in the repair part 10 used. This groove can, for example, correspond in geometry to the cross-section of the part to be repaired either corresponding in essence or being slightly larger. It can be further provided that the run-up and the run-out areas for the weld procedure on the repair part is so integrated that these must likewise must not be joined to the component to be repaired using expensive jigs or separate tack welds.
At least in one advantageous teaching of the design according to the invention, the position of the repair part is always or more frequently reproducible as state of the art. As a result, it is possible to work with a standardization program. The use of jigs can be omitted.
But in particular it can be made possible that the correct and reproducible positioning of the parts to be repaired or of the repair parts is without the use of a jig or without the use of an expensive jig.
| Number | Date | Country | Kind |
|---|---|---|---|
| 10 2007 019 949.1 | Apr 2007 | DE | national |
This application is a U.S. National Phase application submitted under 35 U.S.C. §371 of Patent Cooperation Treaty application serial no. PCT/DE2008/000653, filed Apr. 18, 2008, and entitled SEMI-FINISHED PRODUCT FOR PRODUCING A REPAIRED BLADE FOR A GAS TURBINE AND REPAIR METHOD FOR REPAIRING A BLADE FOR A GAS TURBINE, which application claims priority to German patent application serial no. DE 10 2007 019 949.1, filed Apr. 27, 2007, and entitled HALBZEUG ZUM ERZEUGEN EINER REPARIERTEN SCHAUFEL FÜR EINE GASTURBINE UND REPARATURVERFAHREN FÜR DIE REPARATUR EINER SCHAUFEL FÜR EINE GASTURBINE, the specifications of which are incorporated herein by reference in their entireties.
| Filing Document | Filing Date | Country | Kind | 371c Date |
|---|---|---|---|---|
| PCT/DE08/00653 | 4/18/2008 | WO | 00 | 10/27/2009 |
