| 摘要 |
PROBLEM TO BE SOLVED: To obtain a method for manufacturing a larger multi-blade impeller with less characteristic dispersion to a blade caulked to a reinforcement ring. SOLUTION: In a blade integral type structural element 5, a plurality of curved blades 2 are arranged on an inner periphery of an arc-like outer peripheral structure. After peripheral end faces of the outer peripheral structure are bound with each other and a blade integrated cylinder 8 with blades 2 arranged along a centerline inside is made of low melting point metal, an outer peripheral structure portion 9 is cut and removed with the reinforcement rings 1 left on both ends so as to expose each blade 2 to the outer peripheral part. The peripheral end faces of the outer peripheral structure bound with each other is carried out by projection and indentation fit of a dovetail groove and a dovetail projection, shiplap joint, pressure-insertion, caulking, baking fit, and welding. COPYRIGHT: (C)2004,JPO
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