Method for reducing stresses resulting from partial slot...

Details Method for reducing stresses resulting from partial slot... Method for reducing stresses resulting from partial slot...

2008-04-21

2010-12-07

Trinh, Minh (Department: 3729)

Metal working

Method of mechanical manufacture

Impeller making

C029S402080, C029S598000

Reexamination Certificate

active

07845076

ABSTRACT:
Re-machining a generator rotor tooth dovetail results in a transition zone at an end of the partial re-machined cut, between a newly cut load surface and an original load surface of the rotor tooth. The transition zone is susceptible to stresses that may adversely affect the fatigue strength of the rotor tooth. These stresses can be reduced by the steps of (a) forming at least one axial undercut stress relief groove across the transition zone between the newly cut load surface and the original load surface, (b) cutting and shaping a wedge that will fit in the transition zone, and (c) securing the wedge across the transition zone.

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