Drilling turbine blades
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United States of America Patent
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-
Jun 29, 1993
Grant Date -
N/A
app pub date -
Oct 15, 1991
filing date -
Oct 17, 1990
priority date (Note) -
In Force
status (Latency Note)
Importance
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.
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