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Title: High precision, rapid laser hole drilling

Abstract

A laser system produces a first laser beam for rapidly removing the bulk of material in an area to form a ragged hole. The laser system produces a second laser beam for accurately cleaning up the ragged hole so that the final hole has dimensions of high precision.

Inventors:
; ;
Publication Date:
Research Org.:
The Regents of the University of California, Oakland, CA (United States); Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1176157
Patent Number(s):
7,193,175
Application Number:
11/040,588
Assignee:
The Regents of the University of California (Oakland, CA) OSTI
DOE Contract Number:
W-7405-ENG-48
Resource Type:
Patent
Country of Publication:
United States
Language:
English
Subject:
42 ENGINEERING

Citation Formats

Chang, Jim J., Friedman, Herbert W., and Comaskey, Brian J. High precision, rapid laser hole drilling. United States: N. p., 2007. Web.
Chang, Jim J., Friedman, Herbert W., & Comaskey, Brian J. High precision, rapid laser hole drilling. United States.
Chang, Jim J., Friedman, Herbert W., and Comaskey, Brian J. Tue . "High precision, rapid laser hole drilling". United States. doi:. https://www.osti.gov/servlets/purl/1176157.
@article{osti_1176157,
title = {High precision, rapid laser hole drilling},
author = {Chang, Jim J. and Friedman, Herbert W. and Comaskey, Brian J.},
abstractNote = {A laser system produces a first laser beam for rapidly removing the bulk of material in an area to form a ragged hole. The laser system produces a second laser beam for accurately cleaning up the ragged hole so that the final hole has dimensions of high precision.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Tue Mar 20 00:00:00 EDT 2007},
month = {Tue Mar 20 00:00:00 EDT 2007}
}

Patent:

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  • A laser system produces a first laser beam for rapidly removing the bulk of material in an area to form a ragged hole. The laser system produces a second laser beam for accurately cleaning up the ragged hole so that the final hole has dimensions of high precision.
  • A laser system produces a first laser beam for rapidly removing the bulk of material in an area to form a ragged hole. The laser system produces a second laser beam for accurately cleaning up the ragged hole so that the final hole has dimensions of high precision.
  • This patent describes a method for fabricating a wrought, polycrystalline, carbon containing superalloy article having a small diameter, closely spaced apart holes therein, wherein the article is a nickel or cobalt base material, and has good fatigue strength and creep strength, comprising the steps of: (a) first heat treating the article to produce therein an average grain size of ASTM No. 6-9 and a substantially discontinuous carbide phase precipitate along the boundaries of the grains; (b) piercing the holes in the article with a high energy beam; and then (c) second heat treating the article to produce therein an averagemore » grain size of ASTM No. 4-8.« less
  • This work represents the second phase of a program to demonstrate precision laser drilling with minimal Heat Affected Zone. The technique uses a Diode Pumped Solid State Laser with two wavelengths and two modes of operation. The fundamental mode of the DPSSL at 1.06 microns is used to drill a hole with a diameter of a fraction of a millimeter diameter in a millimeter thick substrate quickly, but with low precision. This hole is then machined to precision dimensions using the second harmonic of the DPSSL Laser at 532 nm using a trepanning technique. Both lasers operate in the ablativemore » mode with peak powers at or above a giga-watt per square centimeter and pulse durations in the 80 - 100 ns range. Under these conditions, the thermal diffusion distance is of the order of a micron or less and that fact coupled with the ablative nature of the process results in little or no HAZ (heat affected zone). With no HAZ, there isn't any change in the crystalline structure surrounding the hole and the strength of the substrate is maintained. Applications for these precision holes include cooling passages in turbine blades, ports for diesel injectors, suction holes for boundary layer control on wings and holes for dies in precision extrusion processes.« less
  • A control and monitoring system controls and monitors a high power laser system for performing high power laser operations. The control and monitoring system is configured to perform high power laser operation on, and in, remote and difficult to access locations.