METHOD OF PRODUCING AN IMPULSE MISTUNING COMPONENT

Abstract

The invention relates to a method for producing a mistuning component. The method comprises the following steps: a) producing a container (34) having at least one chamber (36); b) producing a lid (32, 32′); c) inserting at least one impulse element into the chamber (36); d) joining the lid (32, 32′) and the container (36), wherein joining is carried out by soldering/brazing.

Claims

1.-13. (canceled)

14. A method for producing an impulse mistuning component for a turbine, wherein the method comprises (a) inserting at least one impulse element into a chamber of a container which comprises at least one chamber, and (b) joining a lid and the container by soldering/brazing.

15. The method of claim 14, wherein a furnace, an inductive coil, a laser beam, and/or an electron beam are/is used as a heat source for soldering/brazing.

16. The method of claim 15, wherein a heat treatment is carried out in a vacuum and/or in a protective atmosphere.

17. The method of claim 14, wherein the lid is produced by punching, by laser beam welding, and/or by spark erosion.

18. The method of claim 14, wherein the container is produced by spark erosion, electrochemical processing, and/or mechanical subtraction.

19. The method of claim 14, wherein the container is produced by milling and/or grinding.

20. The method of claim 14, wherein before inserting the at least one impulse element into the chamber, an internal wall of the chamber is treated with a jet of Al.sub.2O.sub.3.

21. The method of claim 14, wherein before joining the lid and the container at least one encircling part of the container to which solder is applied before joining lid and container is freed of oxide.

22. The method of claim 14, wherein soldering/brazing is carried out for 1 s to 60 s.

23. The method of claim 14, wherein before joining lid and container a preshaped filler is placed on the container and/or on the lid.

24. The method of claim 23, wherein the preshaped filler is adhesively bonded to both sides on the lid and on the container before lid and container are joined.

25. The method of claim 23, wherein an external width (bb.sub.A) of the container and an external width (fb.sub.A) of the preshaped filler meet the condition bb.sub.A≧fb.sub.A, and an internal width (bb.sub.I) of the container and an internal width (fb.sub.I) of the preshaped filler meet the condition bb.sub.I≦fb.sub.I, where fb.sub.A>fb.sub.I.

26. The method of claim 23, wherein an external length (bL.sub.A) of the container and an external length (fL.sub.A) of the preshaped filler meet the condition bL.sub.A≧fL.sub.A, and an internal length (bL.sub.I) of the container and an internal length (fL.sub.I) of the preshaped filler meet the condition bL.sub.I≦fL.sub.I, where fL.sub.A>fL.sub.I.

27. The method of claim 25, wherein an external length (bL.sub.A) of the container and an external length (fL.sub.A) of the preshaped filler meet the condition bL.sub.A≧fL.sub.A, and an internal length (bL.sub.I) of the container and an internal length (fL.sub.I) of the preshaped filler meet the condition bL.sub.I≦fL.sub.I, where fL.sub.A>fL.sub.I.

Description

[0021] Preferred exemplary embodiments of the invention will furthermore be described in more detail by means of the schematic drawing in which:

[0022] FIG. 1 shows a perspective view of a known mistuning component;

[0023] FIG. 2 shows a cross section along the plane A of FIG. 1;

[0024] FIG. 3 shows a cross section through a first embodiment of a mistuning component produced according to the invention;

[0025] FIG. 4 shows a cross section through a second embodiment of a mistuning component produced according to the invention;

[0026] FIG. 5 shows a plan view of the container of the mistuning component of FIGS. 3 and 4; and

[0027] FIG. 6 shows a plan view of a preshaped filler used in the production.

[0028] A cross section through a mistuning component 30, 30′ having a lid 32, 32′ and a box-shaped container 34 is depicted in FIGS. 3 and 4. The container 34 used in the two FIGS. 3 and 4 can be seen in a plan view in FIG. 5. The box-shaped container 34 having a rectangular footprint herein has eight chambers 36 of identical size. These chambers 36 on the inside are mutually separated by a longitudinally running separation wall 38 and by three transversely running separation walls 40. These presently identical chambers 36 on the outside are bordered by two longitudinal external walls 42, running in a substantially mutually parallel manner, having an external length bL.sub.A, and by two transverse external walls 44, running in a substantially mutually parallel manner, having an external width bb.sub.A. The separation walls 38 and 40 presently have an identical height to the external walls 42 and 44 (see height h in FIG. 3) such that there is no collar, as can be derived from FIGS. 3 and 4. The widths bs of the external walls 42 and 44 are preferably of identical size. The internal length bL.sub.1 which presently reaches from the chamber on the extreme left to the chamber on the extreme right is an important dimension. The internal width bb.sub.I which reaches from the upper chamber to the lower chamber is a further important dimension. These dimensions are important for both the dimensions of the preshaped filler that is depicted in FIG. 6 as well as for the dimensions of the lid 34.

[0029] A plan view of the preshaped filler 46 to be used is in FIG. 6. The preshaped filler 46 presently is a substantially rectangular frame having an external length fL.sub.A, an internal length fL.sub.I, an external width fb.sub.A and an internal width fb.sub.I.

[0030] In the first embodiment (see FIG. 3), the width db.sub.A of the lid as well as the length dL.sub.A (not depicted) of the lid are smaller than the dimensions of the container, that is to say that bb.sub.A>db.sub.A and bL.sub.A>dL.sub.A. Nevertheless, part of the lid 32 bears on the external walls 42 and 44, so as to enable gas-tight joining. The frame-shaped preshaped filler 46 is dimensioned in such a manner that it presently bears in a substantially quite centric manner on the surface of the external walls 42 and 44. Herein in FIG. 3 fb.sub.I>bb.sub.I and fb.sub.A<bb.sub.A and fL.sub.I>bL.sub.I and fL.sub.A<bL.sub.A. This has the advantage that the solder is somewhat spaced apart from the chambers 36 such that the risk of solder being able to flow into the chambers is low.

[0031] A second embodiment of a mistuning component 30′ produced according to the invention is in FIG. 4. By contrast to the first embodiment, the lid 32′ now has the same dimensions as the container 34, that is to say: bb.sub.A=db.sub.A and bL.sub.A=dL.sub.A. As has already been explained above, these conditions do not have to be met before step d). The frame-shaped preshaped filler 46′ is dimensioned such that it runs in a substantially flush manner in relation to the chambers 36 on the inside, and runs in a substantially flush manner in relation to the external walls 42 and 44 on the outside. Herein in FIG. 4 fb.sub.I=bb.sub.I and fb.sub.A=bb.sub.A and fL.sub.I=bL.sub.I and fL.sub.A=bL.sub.A.

[0032] The method according to the invention will now be described hereunder. In steps a) and b) the lids 32′ are punched preferably from metal, and the egg-box-shaped container 34 is produced. At least one ball (impulse element) is inserted into each chamber 36. Subsequently, the sticky lower side of the preshaped filler 46′ is adhesively bonded to the external walls 42 and 44 of the container 34. The lid 32′ is adhesively bonded to the sticky upper side of the preshaped filler 46′. Attention has to be paid herein that all three parts (preshaped filler, lid, container) are mutually aligned so as to be flush. The preshaped filler 46′ is subsequently made to melt.

LIST OF REFERENCE SIGNS

[0033] 10 Container [0034] 12 Chamber [0035] 14 Longitudinal separation wall [0036] 16 Transverse separation wall [0037] 18 Collar [0038] 20 Lid [0039] 22 Weld seam [0040] 24 Fissure [0041] 25 Notch [0042] 26 Internal edge [0043] 30 Mistuning component [0044] 32 Lid [0045] 34 Container [0046] 36 Chamber [0047] 38 Longitudinally running separation wall [0048] 40 Transversely running separation wall [0049] 42 Longitudinal external wall [0050] 44 Transverse external wall [0051] 46 Preshaped filler [0052] A Plane [0053] bb.sub.A External width of the container [0054] bb.sub.I Internal width of the container [0055] bL.sub.A External length of the container [0056] bL.sub.I Internal length of the container [0057] bs Wall thickness of the external walls [0058] db.sub.A Width of the lid [0059] dL.sub.I Length of the lid [0060] fb.sub.A External width of the preshaped filler [0061] fb.sub.I Internal width of the preshaped filler [0062] fL.sub.A External length of 46 [0063] fL.sub.I External length of 46 [0064] fs Wall thickness of 46 [0065] h Height of the container [0066] h.sub.gas Overall height of the mistiming component