IMPELLER MACHINING METHOD

摘要

PROBLEM TO BE SOLVED: To provide an impeller machining method having high performance, regardless of the material of an impeller material.

SOLUTION: The method is provided for machining an impeller, which has a plurality of blades extending in a radial direction and being provided at intervals in a circumferential direction, and in which flow passages are formed between these blades. The method includes: a flow passage electrical discharge machining step S2 for forming the flow passage by applying an electrical discharge machining to the impeller material; a first polishing step S3 for removing an altered layer formed in the flow passage by the discharge machining; and a second polishing step S4 in which the polishing is applied further on the surface of the flow passage from which the altered layer is removed.

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