US 9,810,069 B2
Repair of a shrouded blade
Gregory Alan Dubs, Palm Beach Gardens, FL (US); and Thomas Horace Milidantri, Jensen Beach, FL (US)
Assigned to ANSALDO ENERGIA SWITZERLAND AG, (CH)
Filed by ANSALDO ENERGIA SWITZERLAND AG, Baden (CH)
Filed on Jun. 14, 2013, as Appl. No. 13/917,876.
Claims priority of provisional application 61/667,090, filed on Jul. 2, 2012.
Prior Publication US 2014/0003948 A1, Jan. 2, 2014
Int. Cl. F01D 5/00 (2006.01); B23P 6/00 (2006.01)
CPC F01D 5/005 (2013.01) [B23P 6/007 (2013.01); Y10T 29/49318 (2015.01)] 12 Claims
OG exemplary drawing
 
1. A method of repairing a shrouded blade of a gas turbine engine comprising:
determining a datum plane from which to measure deflections of the shrouded blade;
determining spatial position for a plurality of hardface surfaces of a shroud for the blade;
determining a displacement of the hardface surfaces for each shroud in a set of blades utilizing a mean, mode, or median displacement for the hardface surfaces of a set of shrouded turbine blades;
determining a cross shroud dimension for the shrouded blade;
removing material from one or more of the hardface surfaces of the shrouded blade;
adding material to one or more hardface surfaces of the shrouded blade;
machining a first side hardface surface to a desired dimension based on the displacement of the hardface surfaces; and
machining a second side hardface surface such that the distance between the first side hardface and second side hardface corresponds to approximately the cross shroud dimension.