Percussion drilling and trepanning are two laser drilling methods. Circular laser spots are generally used in conventional laser drilling. An annular laser beam provides a new drilling mechanism. When an annular beam is focused on the workpiece surface, the material within the annulus is heated, melted (possibly vaporized), and removed, leading to the formation of a hole. This process, which we refer to as “optical trepanning”, involves no rotating optics or any motion of the workpiece. Based on the ray tracing technique, a refractive axicon lens system has been designed to transform a Gaussian circular laser beam into an annular laser beam. An analytical two-dimensional model was developed for optical trepanning. The analysis accounted for conduction in the solid, vaporization and convection due to the melt flow caused by an assist gas. Based on the model, the influences of pulse duration, pulse repetition rate, irradiance profiles and beam radius were investigated to examine their effects on the recast layer thickness, hole depth and taper. Experiments have been conducted on Inconel 718. Annular melt spots with different outer diameters are obtained with annular laser irradiation.
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ICALEO 2005: 24th International Congress on Laser Materials Processing and Laser Microfabrication
October 31–November 3, 2005
Miami, Florida, USA
ISBN:
978-0-912035-82-6
PROCEEDINGS PAPER
Optical trepaning using axicon lenses
D. Zeng;
D. Zeng
1
Laser-Aided Manufacturing, Materials and Micro-processing Laboratory (LAMMMP), College of Optics and Photonics, Center for Research and Education in Optics and lasers (CREOL), Mechanical, Materials and Aerospace Engineering Department, University of Central Florida
, Orlando, FL 32816-2700, USA
; Email: [email protected]
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W. P. Latham;
W. P. Latham
3
Air Force Research Laboratory, Directed Energy Directorate
3550 Aberdeen Avenue SE, Kirtland Air Force Base, NM 87117-5776, USA
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P. F. Jacobs;
P. F. Jacobs
4
Vice President of R&D, Laser Fare Inc
., One Industrial Drive South, Smithfield, RI 02917, USA
Email: [email protected]
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A. Kar
A. Kar
1
Laser-Aided Manufacturing, Materials and Micro-processing Laboratory (LAMMMP), College of Optics and Photonics, Center for Research and Education in Optics and lasers (CREOL), Mechanical, Materials and Aerospace Engineering Department, University of Central Florida
, Orlando, FL 32816-2700, USA
; Email: [email protected]2Email: [email protected]
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Published Online:
October 01 2005
Citation
D. Zeng, W. P. Latham, P. F. Jacobs, A. Kar; October 31–November 3, 2005. "Optical trepaning using axicon lenses." Proceedings of the ICALEO 2005: 24th International Congress on Laser Materials Processing and Laser Microfabrication. ICALEO 2005: 24th International Congress on Laser Materials Processing and Laser Microfabrication. Miami, Florida, USA. (pp. M205). ASME. https://doi.org/10.2351/1.5060534
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