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ITERATIVE
3D LASER FORMING OF CONTINUOUS SURFACES
23nd
International Congress on Applications of Lasers & Electro-Optics
(ICALEO 2004), San Francisco, California, October 4-7,
2004, Paper No. 405, Laser Institute of America, Publication
No 597, Vol. 97, ISBN 0-912035-77-3 (2004)
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S.
P. Edwardson 1, A. J. Moore 2,
E. Abed1, R. McBride 2, P. French
1, D. P. Hand 2,
G. Dearden 1, J. D.C. Jones 2,
K. G. Watkins 1
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1
- Laser Group, Department of Engineering, The University
of Liverpool, Liverpool, U.K.
2 - School of Engineering and
Physical Sciences, Heriot-Watt University, Edinburgh,
EH14 4AS, UK
Abstract:
There
has been a considerable amount of work carried out on
two-dimensional laser forming, using multi-pass straight
line scan strategies to produce a reasonably controlled
bend angle in a number of materials, including aerospace
alloys. However in order to advance the process further
for realistic forming applications and for straightening
and aligning operations in a manufacturing industry it
is necessary to consider larger scale controlled 3D laser
forming. The work presented in this paper uses a predictive
and adaptive approach to control the 3D laser forming
of 1.5mm Mild Steel sheet into a desired continuous surface.
The surface considered in the study was the pillow (or
dome) shape. Key to the control of the process was the
development of a predictive model to give scan strategies
based on a required geometry. When the geometry is not
formed within one pass, an incremental adaptive approach
is used for subsequent passes, utilising the error between
the current and desired geometry to give a new scan strategy,
thus any unwanted distortion due to material variability
can be accounted for. The forming rate and distribution
of the magnitude of forming across the surface were controlled
by the process speed.
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