Cylindrical hole and form centring and drilling device
The invention relates to a device for the electrical discharge machining of at least one rectilinear cooling air passage ( 6 ) having a flared opening ( 8 ) in the wall of a hollow turbine vane ( 2 ). The inventive device comprises at least one forming electrode ( 10 ) attached to a first electrode...
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| Format: | Patent |
| Sprache: | eng |
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| Zusammenfassung: | The invention relates to a device for the electrical discharge machining of at least one rectilinear cooling air passage (
6
) having a flared opening (
8
) in the wall of a hollow turbine vane (
2
). The inventive device comprises at least one forming electrode (
10
) attached to a first electrode holder and intended to produce the flared outlet opening. The forming electrode (
10
) comprises a first face(
28
a
) which is provided with a groove for guiding a rectilinear electrode (
7
) designed to drill the rectilinear part of the air passage (
6
), a median portion (
28
) with a constant section and a pointed end portion with a section that decreases between the median portion and the point of the forming electrode. |
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