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Proceedings Paper

LBDE: Laser Beam Drilling Efficiency unit: the Daud
Author(s): G. Daurelio
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Paper Abstract

For L.B.D. - Laser Beam Drilling (or Micro-Drilling) does not exist some measurement unit that carries out the efficiency of this process. All this for any type of laser used to produce micro-holes ("blind drills", "passing holes" as well "straight and tilted holes"). The usual parameters, measured on the micro-drill, such as Drill Height, Drill Diameter (on input and output), Aspect Ratio (height/diameter), Average Input and Output Diameters, Cylindrical shape (Average Input Diameter/Average Output Diameter), Ellipticity (on the input or output) furnish many information regarding the correct shape and geometry of the micro-drill obtained compared to one requested. In this experimental work and paper, some new quantitative parameters have been carried out to detect, evaluate as well as characterize the micro-drilling tests:
(1) P.D. / Pulse N. (μm / pulse) *
(2) Pulse N. x 150mJ / P.D. ( mJ / μm
(3) P.D. / Pulse N. × 150mJ ( μm / mJ )
(4) 1 DaudE = μm / μ
(5) 1 DaudV = μm 3/ m
where P.D. is the Penetration Depth for blind drills like to Drill Height for Passing Holes . So, a Laser Beam Drilling Efficiency unit, the Daud ( 1 DaudE = μm / mJ or 1 DaudV = μm3/ mJ ) could be adopted as a quantitative parameter to see how the process of micro-drilling, by that type of laser on that material, has been efficient. In this paper, for example, some results obtained on some different Metals and Alloys, by using a Nd- YAG Laser, λ2 ( 2nd harm. ) 532 nm - Pulse Width 11ns - E 150 mJ / pulse, Focusing Lens in BK7 (borosilicate ) - 60mm F. L. and Optical Focused Spot on the surface of the target, are considered and evaluated. A laser percussion micro-drilling, fig.1, process has been tested on 11 different Aluminium and its alloys (Series 1000 - 2000 - 5000 and 6000; in particular AA1090 - AA2024 - AA5083 - AA5754 - AA6082 and AA 8090 ), on 7 different Cu and its alloys. The thicknesses tested for Al alloys ranging on 70 - 240 - 480 - 800 and 1000 μm as well as 50 - 100 - 180 - 280 and 500 μm for Cu and Alloys. A Nd-YAG Laser Source, (QUANTEL), YG 580 type, was used for the experiments. This laser , in Q-Switch Mode, has the following characteristics :
(1) Repetition Rates ( Single Shot, 2Hz and 10Hz ), Focusing Lens BK7 - 60 mm F.L.
(2) λ2 532 nm - Pulse Width 11ns - E 150 mJ/pulse.
The aim of this work was :
(1) the possibility to obtain micro-drills on the range from 500 to 25 μm diameters with some Aspect Ratio high values. At the same time the realization of some "blind drills", "passing holes" as well as "straight and tilted holes was proved;
(2) The possible adoption of a Laser Beam Drilling Efficiency (L.B.D.E.) unit, the DaudE and / or DaudV.

Paper Details

Date Published: 16 November 2010
PDF: 14 pages
Proc. SPIE 7751, XVIII International Symposium on Gas Flow, Chemical Lasers, and High-Power Lasers, 77511H (16 November 2010); doi: 10.1117/12.880956
Show Author Affiliations
G. Daurelio, Univ. degli Studi di Bari (Italy)
Politecnico di Bari (Italy)


Published in SPIE Proceedings Vol. 7751:
XVIII International Symposium on Gas Flow, Chemical Lasers, and High-Power Lasers
Tanja Dreischuh; Petar A. Atanasov; Nikola V. Sabotinov, Editor(s)

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