Method for checking a bore hole

Details Method for checking a bore hole Method for checking a bore hole

2004-10-23

2009-12-29

Evans, Geoffrey S (Department: 3742)

Electric heating

Metal heating

By arc

C219S121830

Reexamination Certificate

active

07638733

ABSTRACT:
Pulsed laser drilling is used to produce bore holes having a small diameter, for example, in hollow workpieces. Turbine blades, e.g., have a multitude of fine cooling air bore holes, which are able to be produced by this method, e.g., with high positional accuracy and in an automated manner.A checking method is provided by which drilling faults, e.g., with regard to piercing and bore-hole geometry, may be detected in a more reliable manner.A method is for checking a bore hole introduced in a workpiece by laser pulses, in which characteristic signals from the area of the bore hole are received with the aid of a sensor and compared to setpoint values and only signals received in a characteristic time interval following a laser pulse are taken into account.

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