Method and device for riveting a shroud to the tips of rotor blades
AssigneeGEC Alsthom SA
InventorMarcel Demichel
Life of this patent
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Abstract
A method and device for rivetting a shroud to the blades of a rotor stage of a rotor, each blade having one or more tenons adapted to be inserted into one or more holes in the shroud. The tenons are at an angle to the median plane of the rotor stage. A rivetting head is positioned in line with the tenon to be rivetted and held in place by two flanges between which the group of blades is clamped. The head then moves into alignment with another tenon along a circular arc or laterally. The method and device enable regular repetitive rivetting without any medical or legal restrictions.
Claims11
Method of rivetting a shroud to a plurality of blades of a rotor stage of a horizontal axis rotor, each blade having a tip and comprising at said tip one or more tenons adapted to be inserted, respectively into one or more holes in the shroud, said tenons being at an acute angle c to the median plane of the rotor stage orthogonal to the rotor axis, said method comprising:
- setting up a rivetting head for a specific rotor stage for movement in a circular manner in the vicinity of the tips of the rotor stage blades so that the rivetting head is over a tenon with the rivetting head axis alignable with the axis of the tenon, and then;
- centering a first tenon in front of the rivetting head,
- clamping the head against vertical and horizontal movement,
- clamping together a group of blades including the blade to be shrouded by the rivetting head,
- clamping the shroud against the tip of the blade,
- rivetting the tenon,
- unclamping the shroud and the group of blades,
- unclamping the rivetting head to allow vertical and horizontal movement thereof,
- rotating the rivetting head to bring a second tenon in front of the rivetting head, and
- repeating the rivetting operations, and so on until all of the tenons of said shroud have been treated in this manner.
Device for rivetting a shroud to a plurality of blades of a rotor stage of a rotor to bind them together, each blade having a tip and comprising at said tip, one or more tenons adapted to be inserted into one or more holes respectively in said shroud, said tenons being at an acute angle c to the median plane P of the rotor stage orthogonal to the rotor axis, said device comprising:
- a carriage supporting a rivetting head, having a rivetting tool adapted to come into contact with the tenon and including means for moving said rivetting head about the axis of the head to rivet the shroud by flattening the tenon, the axis of the rivetting head being coincident with the axis of the tenon, the rivetting head being fastened to two flanges parallel to the axis of the rivetting head, each flange terminating in a part parallel to the plane P, each of these parts carrying a jaw and means for moving the jaws to immobilize a group of blades including the blade to which the shroud is to be rivetted.
A device for rivetting a shroud to blades of a rotor stage of a horizontal axis rotor, each blade having a tip and comprising at said tip, one or more tenons adapted to be inserted into one or more holes respectively in the shroud, said tenons being at an acute angle c to the medium plane of the rotor stage orthogonal to the rotor axis, said device comprising means for setting up a rivetting head for a specific rotor stage so that said rivetting head can move in a circular manner in the vicinity of the tips of the rotor stage blades and so that when said rivetting head is over a tenon, the axis of said rivetting head is aligned with the axis of the tenon, means for centering a first tenon in front of the rivetting head, means for clamping the head against vertical and horizontal movement, means for clamping a group of blades including the blade to be shrouded by the rivetting head together, means for clamping said shroud against the tip of the blade, means for rivetting the tenon, and wherein repetitive rivetting operations are effected by unclamping the shroud and the group of blades after the tenon is rivetted, unclamping the rivetted head to allow vertical and horizontal movement thereof, moving the rivetting head to bring a second tenon in front of the rivetting head, and so on, until all of the tenons of a shroud have been treated in this manner.
Dependencies are inferred from the claim text.