Drilling turbine blades

Details Drilling turbine blades Drilling turbine blades

1991-10-15

1993-06-29

Albritton, C. L.

Electric heating

Metal heating

By arc

21912185, B23K 2600

Patent

active

052226174

ABSTRACT:
Small cooling holes, e.g. 0.25-0.9 mm diameter, in cast hollow turbine blades are provided by delivering successive pulses of laser energy to the surface of the blade until penetration of the blade is complete. By leaving the ceramic casting core in situ within the blade during drilling, the laser beam is prevented from striking through to the far wall of the cavity defined by the ceramic core within the blade. The ceramic core is subsequently removed by leaching techniques common to the art.

REFERENCES:
patent: 4574451 (1986-03-01), Smashey et al.
patent: 4873414 (1989-10-01), Ma et al.
patent: 5011626 (1991-04-01), Ma et al.

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