| 摘要 |
PROBLEM TO BE SOLVED: To maintain a processing accuracy, when executing two kinds of different processes at one end and the other end of a workpiece respectively, by maintaining these two kinds of reference planes for processing. SOLUTION: After having machined a tree part T at one end of the workpiece W (a rotor blade of a gas turbine engine) based on a first processing standard attached at the other end of the workpiece W, the a first processing standard as a reference, a second processing standard of a casting part 31, which castingly envelopes the tree part T, is provided at the other end of the workpiece W. And after having an electric discharge machining a blade B and a platform P at the other end of the workpiece W based on the second processing standard, the casting part 31, which is low-melting than the workpiece W, is eliminated by a heat melting. Herewith, two kinds of reference planes for processing are ensured, when the first processing and the second processing are executed at one end and the other end of the workpiece respectively, and a preservation of precisions required for each processing is enabled.
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