Methods for forming dovetails for turbine buckets

Details Methods for forming dovetails for turbine buckets Methods for forming dovetails for turbine buckets

2006-03-07

2006-03-07

Jimenez, Marc (Department: 3726)

Metal working

Method of mechanical manufacture

Impeller making

C029S557000, C416S22300B, C219S069170, C216S094000

Reexamination Certificate

active

07007383

ABSTRACT:
A dovetail preform having linearly extending hooks and slots is finished to provide arcuate slots and hooks for securement of the finished bucket dovetail to a correspondingly-shaped dovetail of a turbine wheel. An electrode having the general configuration of the dovetail with arcuate hooks and slots is provided. After relatively linearly displacing the electrode and preform, disposed in an electrolytic solution, to insert the electrode hooks into the slots of the preform, the electrode and preform are relatively displaced in a direction normal to the direction of the linear slots and hooks of the preform such that metal of the preform is burned to form arcuate finished surfaces along the hooks of the preform. In another embodiment, the electrode has a dovetail configuration as a negative of the finished dovetail for the bucket and passes along an arc of a circle through the linearly extending slots of the preform to form the opposed concave and convex surfaces of the finished bucket dovetail.

REFERENCES:
patent: 4623349 (1986-11-01), Lord
patent: 5092039 (1992-03-01), Gaskell
patent: 6532662 (2003-03-01), Kobayashi et al.
patent: 2003/0196990 (2003-10-01), Arness et al.

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