Four laser scanning schemes for tube bending, including point-source circumferential scanning, pulsed line-source axial procession, and line-source axial scanning without and with water cooling are investigated in numerical simulation. The coupled thermomechanical model established using the finite element method is validated and applied to predict the bending deformation and help better understand bending mechanisms under different schemes. The influence of important parameters such as beam coverage, scanning velocity and cooling offset on the deformation is investigated in detail. Parametric studies are carried out to determine proper processing windows at which the largest bending can be obtained. The deformation characteristics, including the wall thickness variation and the cross-section distortion produced by different scanning schemes are analyzed, along with the processing efficiency.

Issue Section:
Technical Papers
Keywords:
pipes, bending, laser beam applications, cooling, finite element analysis, forming processes
Topics:
Cooling, Deformation, Lasers, Tube bending, Water, Wall thickness, Laser beams
1.
Silve
,
S.
,
Steen
,
W. M.
, and
Podschies
,
B.
, 1998, “
Laser Forming Tubes: A Discussion of Principles
,”
Proceedings of ICALEO
, Sec. E, pp.
151
–
160
.
2.
Kraus
,
J.
, 1997, “
Basic Process in Laser Bending of Extrusion Using the Upsetting Mechanism
,”
Laser Assisted Net Shape Engineering 2
,
Proceedings of the LANE’97
,
Meisenbach Bamberg
, Germany, Vol.
2
, pp.
431
–
438
.
3.
Li
,
W.
, and
Yao
,
Y. L.
, 2001, “
Laser Bending of Tubes: Mechanism, Analysis and Prediction
,”
ASME J. Manuf. Sci. Eng.
1087-1357,
123
, pp.
674
–
681
.
Crossref
Search ADS
 
4.
Bachmann
,
F.
, 2002, “
Present Technology, Industrial Applications and Future Prospects of High Power Diode Lasers
,” ALT’01 International Conference on Advanced Laser Technologies,
Proc. SPIE
0277-786X,
4762
, pp.
1
–
5
.
5.
Lawrence
,
J.
, 2002, “
A Comparative Investigation of the Efficacy of CO2 and High-Power Diode Lasers for the Forming of EN3 Mild Steel Sheets
,”
Proc. Inst. Mech. Eng., Part A
0957-6509,
216
, pp.
1481
–
1491
.
Crossref
Search ADS
 
6.
Lopez
,
D.
,
Dubslaff
,
J.
,
Hofling
,
R.
, and
Aswendt
,
P.
, 2003, “
Application of a High-Power Diode Laser for Laser Bending
,”
Proc. Inst. Electr. Eng.
0020-3270,
3097
, pp.
692
–
697
.
7.
Shealy
,
L. D.
, 2002, “
Historical Perspective of Laser Beam Shaping
,” Laser Beam Shaping III,
Proc. SPIE
0277-786X,
4770
, pp.
28
–
47
.
8.
Mucha
,
Z.
,
Cabaj
,
M.
,
Gradon
,
R.
,
Pawlowski
,
M.
, and
Widlaszewski
,
J.
, 2001, “
Laser Forming of Plates by Use of Beam With Circular and Rectangular Cross Section
,”
Laser Assisted Net Shape Engineering
,
Proceedings of the LANE’2001
,
Meisenbach Bamberg
, Germany, Vol.
1
, pp.
527
–
536
.
9.
Triantafyllidis
,
D.
,
Li
,
L.
, and
Stott
,
F. H.
, 2002, “
The Effect of Beam Shape in Laser Surface Treatment of Ceramics
,”
Proceedings of ICALEO
, Sec. E.
10.
Churchill
,
S. W.
, and
Berstein
,
M.
, 1977, “
A Correlating Equation for Forced Convection From Gases and Liquids to a Circular Cylinder in Crossflow
,”
ASME J. Heat Transfer
0022-1481,
99
, pp.
300
–
306
.
Crossref
Search ADS
 
11.
Kobayashi
,
S.
, 1989,
Metal Forming and the Finite Element Method
,
Oxford University Press
, New York.
12.
Boley
,
B. A.
, and
Weiner
,
J. H.
, 1997,
Theory of Thermal Stresses
,
Dover
, New York.
13.
Vollertsen
,
F.
, 1994, “
Mechanism and Models for Laser Forming
,”
Laser Assisted Net Shape Engineering
,
Proceedings of the LANE’94
,
Meisenbach Bamberg
, Germany, Vol.
1
, pp.
345
–
360
.
14.
Myers
,
R. H.
, and
Montgomery
,
D. C.
, 1995,
Response Surface Methodology
Wiley
, NewYork.
15.
Li
,
W.
, and
Yao
,
Y. L.
, 2001, “
Laser Forming With Constant Line Energy
,”
Int. J. Adv. Manuf. Technol.
0268-3768,
17
, pp.
196
–
203
.
Crossref
Search ADS
 
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