Method of assembling one-piece bladed disks, and a device for damping vibration of the blades of such disks
View Patent ↗A method of assembling together one-piece bladed disks by friction welding, and a damper device for damping vibration of the blades of the disks. The damper device includes annular linings for covering the blades and filling the gaps between the blades, the linings being made of elastomer and being held and clamped when mounted on the blades.
1. A method of assembling together one-piece bladed disks, the method comprising:
mounting a vibration damper means on and between blades of the disks, and
welding the disks together by friction welding.
2. A method according to claim 1 , further comprising machining the blades of the disks before welding the disks together by friction welding.
3. A method according to claim 1 , further comprising mounting an additional vibration damper means between the damper means mounted on the blades of a disk during friction welding and a portion of a welding machine that faces said vibration damper means mounted on the blades.
4. A method according to claim 3 , wherein the additional damper means includes elastomer blocks clamped between said portion of the welding machine and the vibration damper means mounted on the blades.
5. A device for damping vibration of blades of a one-piece bladed disk, the device being designed to be mounted on the blades of the disk to damp vibration of said blades while the disk is being assembled to another disk by friction welding, the device comprising covering and filler means for covering the blades and filling the gaps between the blades, said “means for covering the blades and filling the gaps between the blades”, being made of an elastically deformable material, and means for holding and clamping the covering and filler means a holding and clamping device configured to hold and clamp said cover and filler mounted on the blades.
6. A device according to claim 5 , wherein the covering and filler means comprise annular linings designed to be engaged on concave faces and the convex faces, respectively, of the blades.
7. A device according to claim 6 , wherein surfaces of the annular linings that are designed to come into contact with the blades are of shapes that are complementary to shapes of the blades.
8. A device according to claim 7 , wherein the linings are made in molds fabricated by stereolithography from digital files numerically specifying the shapes of the blades.
9. A device according to claim 6 , including an annular lining for pressing against upstream faces of the blades and of the disk, and an annular lining for pressing against downstream faces of the blades and of the disk, facing faces of the linings being of shapes that are complementary to shapes of the blades and being substantially complementary to each other.
10. A device according to claim 6 , wherein each annular lining is made up of a plurality of elements designed to be placed end to end around a circumference.
11. A device according to claim 6 , wherein the linings are made of elastomer.
12. A device according to claim 11 , wherein the linings are made of silicone or of polyurethane.
13. A device according to claim 6 , wherein the means for holding and clamping the linings comprise two annuluses of rigid material, each having a radial annular face for pressing against and supporting one of the annular linings and a peripheral rim provided with axial clamping means for axially clamping the linings against the blades of the disk.
14. A device according to claim 13 , wherein the axial clamping means comprise screws or bolts.
15. A device according to claim 13 , including means for centering and positioning the linings on the annuluses.
16. A device according to claim 15 , wherein the means for centering and positioning the linings on the annuluses comprise studs formed to project from the linings and received in corresponding cavities or orifices of the annuluses.
17. A device according to claim 13 , wherein each annulus is made of two semicircular elements that are assembled together in releasable and separable manner.
18. A device according to claim 13 , including adjustment spacers for placing between the annuluses to determine the degree to which the linings are clamped axially by the annuluses.
19. A device according to claim 13 , wherein the linings have radially inner annular rims for being pressed and clamped by the annuluses against a peripheral ring of the disk on which the blades are formed.
20. A device according to claim 5 , wherein the one-piece bladed disk is a disk of a turbojet compressor.