DAMPING DEVICE, WELDING SYSTEM FOR ROTARY FRICTION WELDING AND ROTARY FRICTION WELDING METHOD

• US 20100193572A1
• Filed: 07/24/2008
• Published: 08/05/2010
• Est. Priority Date: 08/04/2007
• Status: Abandoned Application

• Current Assignee: MTU Aero Engines GmbH (MTU)
• Original Assignee: MTU Aero Engines GmbH (MTU)
• Inventors: Weber, Steffen, Bayer, Erwin
• Application Number:
  US12/671,487
• Publication Number:
  US 20100193572A1
• Time in Patent Office: Days
• US Class Current: 228/112.1
• CPC Class Codes: B23K 20/12 the heat being generated by friction; Friction welding
• CPC Class Codes: F16F 15/16 using a fluid or pasty materialF16F9/53, F16F15/13157 take precedence; devices connecting input and output members F16D
• CPC Class Codes: F16F 2224/048 High viscosity, semi-solid pastiness F16F2224/041 takes precedence

Abstract

The invention relates to a damping device (20), which in order to reduce vibrations occurring during the rotary friction welding of a first to at least one second component (12a, 12b) can be disposed on at least one of said components (12a, 12b), wherein the damping device (20) comprises a casing element (22), which is filled at least partially with a viscoelastic fluid (24) invention further relates to a welding system (10) and to a method for the rotary friction welding of a first to at least one second component (12a, 12b), and to a component (12), particularly for an aircraft engine.

Claims

1-24. -24. (canceled)

25. A damping device to lessen the vibrations occurring during rotary friction welding of a first structural part to at least a second structural part, the damping device comprising:

a fillable casing element formed of a thin, stretchable material; and

a viscoelastic fluid, the viscoelastic fluid at least partially filling the casing element.

26. A damping device in accordance with claim 25, wherein:

the casing element is adapted to be positioned in one of

a) a space between a structural part and a rotary spindle of a welding layout,

b) a space between a structural part and a stationary spindle of a welding layout or

c) a space between a first and a second structural part; and

the casing element is further adapted to bear reliably against the respective structural parts and/or spindle on either side of the space after filling with an adjustable quantity of viscoelastic fluid.

27. A damping device in accordance with claim 25, wherein the casing element is configured as a cushion and/or a ring.

28. A damping device in accordance with claim 25, wherein the casing element is made at least partly from an elastomer.

29. A damping device in accordance with claim 25, wherein the viscoelastic fluid contains dispersed metal particles.

30. A damping device in accordance with claim 29, wherein the metal particles are prepared by precipitation of metal salts dissolved in the viscoelastic fluid.

31. A damping device in accordance with claim 29, wherein the dispersed metal particles are present essentially in clusters with up to 100±

15 atoms.

32. A damping device in accordance with claim 29, wherein the viscoelastic fluid contains at least one stabilizer, by means of which the dispersed metal particles are held in dispersion.

33. A damping device in accordance with claim 25, wherein the viscoelastic fluid comprises at least one material selected from the group consisting of nonpolar solvents, polar solvents, protic solvents and water.

34. A damping device in accordance with claim 25, wherein the viscoelastic fluid comprises a polymer

35. A damping device in accordance with claim 34, wherein the polymer comprises at least one material selected from the group consisting of polypeptides, polysaccharides and polyacrylamides.

36. A welding system for the rotary friction welding of a first structural part to at least one second structural part, the system comprising:

a rotary spindle having an axis of rotation;

a first holding device by means of which a first structural part can be held on the rotary spindle to impart a rotating motion to the first structural part;

a stationary spindle;

a second holding device by means of which a second structural part can be held on the stationary spindle;

at least one damping device including

a fillable casing element formed of a thin, stretchable material and

a viscoelastic fluid at least partially filling the casing element;

wherein the rotary spindle and the stationary spindle are movable relative to each other along the axis of rotation in order to press the first and second structural parts together with an axial pressure; and

wherein the at least one damping device reduces vibrations within the first and/or the second structural part occurring during the rotary friction welding.

37. A welding system in accordance with claim 36, wherein the damping device is adapted to be positioned in one of:

a) a space between a structural part and a rotary spindle;

b) a space between a structural part and a stationary spindle; and

c) a space between a first and a second structural part.

38. A welding system in accordance with claim 36, wherein at least one of the first holding device and the second holding device includes a chuck with at least one clamping jaw.

39. A welding system in accordance with claim 36, wherein at least one of the first structural part and the second structural part is held on its respective spindle by at least one additional structural part.

40. A welding system in accordance with claim 36, wherein the at least one damping device is positioned between one of:

a) the first structural part and the at least one additional structural part; and

b) the second structural part and the at least one additional structural part.

41. A method for rotary friction welding of a first structural part to at least one second structural part, the method comprising the following steps:

providing a welding system wherein a first structural part is held by means of a first holding device on a rotary spindle having an axis of rotation and the second structural part is held by means of a second holding device on a stationary spindle;

positioning at least one damping device including a casing element that is at least partly filled with a viscoelastic fluid against one of the first structural part, the second structural part, the rotary spindle and the stationary spindle;

rotating the rotary spindle and first structural part while moving the rotary spindle and first structural part along the axis of rotation relative to the stationary spindle and the second structural in order to press the first and second structural parts together with an axial pressure until the first and second structural parts are welded together.

42. A welding system in accordance with claim 41, wherein the at least one damping device is positioned in one of:

a) a space between the first structural part and the rotary spindle; and

b) a space between the second structural part and the stationary spindle.

43. A welding system in accordance with claim 42, wherein while positioning the at least one damping device:

the casing element is first arranged between the rotary spindle and the first structural part or between the stationary spindle and the second structural part; and

the casing element is then filled with an adjustable amount of viscoelastic fluid, so that the casing element bears at least in regions against the respective spindle and structural part.

44. A structural part, especially for an aircraft engine, made using a method of rotary friction welding in accordance with claim 41.