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Proceedings Paper

Investigation of normal and slant laser cutting using cw and pulsed CO2 laser for laminated object manufacturing techniques
Author(s): Poonjolai Erasenthiran; William O'Neill; William M. Steen
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Paper Abstract

The application of laser cutting in Laminated Object Manufacturing has been investigated and applied since the early eighties. Virtually all of the work done has concentrated on normal cutting using oxygen gas assist. In assembling models from normal-cut sheets additional work is required to remove steps which are time consuming and raise production costs. This work investigates the application of slant cutting in the construction of metal laminated models. This paper presents the results of an experimental investigation into normal and slant-cutting operations using both CW and pulsed CO2 laser modes for 1 mm mild steel. The effects of different cutting gases and cutting gas pressures have been investigated including the use of oxygen, air and nitrogen. High pressure Laval nozzles were used for air and nitrogen gas assist cutting with stand-off up to 15 mm. For normal-cutting, the experiments revealed that pulsed laser cutting with oxygen gas assist provides optimum cutting with a wide range of speeds and gas pressures. It also results in a stable kerf width with 0.78 micrometers standard deviation which produces high dimensional accuracy. Thus laser cutting would be suitable for complex part profiling and layered manufacturing applications. The use of oxygen in slant cutting produces higher kerf widths and edge burning for samples angled from the horizontal above 20 degree(s). The quality of slant cutting was improved with air and nitrogen assist gas. Slant angles up to 50 degree(s) were cut using CO2 laser with 12 bar air and 20 bar N2 at the nozzle.

Paper Details

Date Published: 18 August 1997
PDF: 10 pages
Proc. SPIE 3097, Lasers in Material Processing, (18 August 1997); doi: 10.1117/12.281113
Show Author Affiliations
Poonjolai Erasenthiran, Univ. of Liverpool (United Kingdom)
William O'Neill, Univ. of Liverpool (United Kingdom)
William M. Steen, Univ. of Liverpool (United Kingdom)

Published in SPIE Proceedings Vol. 3097:
Lasers in Material Processing
Leo H. J. F. Beckmann, Editor(s)

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