Metal working – Method of mechanical manufacture – Impeller making
Reexamination Certificate
2005-08-19
2010-11-23
Chang, Rick K (Department: 3726)
Metal working
Method of mechanical manufacture
Impeller making
C029S889700, C029S889710, C029S889720, C228S119000, C277S412000, C277S415000, C427S142000, C427S191000, C427S404000, C427S180000, C427S202000, C427S421100
Reexamination Certificate
active
07836593
ABSTRACT:
A quantity of particles (28) may be cold-sprayed toward the distal surface (22) of a turbine blade (6) at a temperature below a melting point of the particles at a velocity sufficiently high to cause at least a portion of the particles to adhere to the surface to form squealer ridge (24) with a desired cutting profile. The cutting profile may be defined by a face (52) and a land (54) disposed at a relief angle (38) relative to a direction of motion (58) of a cutting edge (48). The ridge may be built by multiple passes of a cold spray gun depositing sequential layers (30, 32, 34) of varying widths. An in-service blade having worn distal surface may be repaired using this technique.
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Chang Rick K
Siemens Energy Inc.
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