COVER FOR TURBINE BUCKET AND METHOD FOR ASSEMBLING THE SAME

PROBLEM TO BE SOLVED: To provide a multi-layer bucket cover having an intermediate perforated layer, and a method for assembling the same. SOLUTION: Each segment 23 includes circumferentially spaced radial openings through elements for receiving tenons at bucket tips. An intermediate element has a cavity 46 or a recess formed between circumferentially spaced webs 52 which define the openings through the intermediate element for weight reduction purposes. In a final assembly, tips of the tenons are automatically peened to retain the elements on the buckets and excess material is machined to provide a smooth, continuous arcuate, circumferentially extending outer surface. The cavity is bounded by the webs 52, a forward end wall 48 and a rear end wall 50 and an inner surface of the outer layer and an outer surface of the inner element. COPYRIGHT: (C)2004,JPO