Laser drilling of components
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United States of America Patent
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-
Jan 21, 1992
Issued Date -
N/A
app pub date -
Feb 25, 1991
filing date -
Mar 2, 1990
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
In the laser drilling of gas turbine engine blades there is provided a method of maintaining constant the distance between a laser nozzle and the surface to be drilled by measuring the topography of the surface and using that data to control the focusing of the laser beam onto the surface. The topography is measured by determining the back pressure of a stream of oxygen blown through the nozzle onto the surface, and relating the back pressure to the distance between the nozzle and the surface. The distance measured is used to control a servo operated table so as to move the surface to the optimum distance from the nozzle.
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