Single pulse drilling of micro holes (diameter 100 µm, depth<2 mm) in stainless steel (X5CrNi18-10) and nickel-base superalloy (CMSX-4) is performed by pulsed Nd:YAG laser radiation (pulse duration 100-500 µs). The movement of the melting front is investigated by metallography and optical microscopy. The formation of the hole geometry is compared to the spatial and temporal distribution of the pulse power. The processing limits regarding the aspect ratio (diameter: depth) are extended and the quality of drilled holes regarding recast layers in drilled holes, cylindricity, and defined conicity is extended.
REFERENCES
1.
L.
Trippe
, J.
Willach
, E.W.
Kreutz
, W.
Schulz
, J.
Petereit
, S.
Kaierle
, R.
Poprawe
(2004
) Melt ejection during single pulse drilling and percussion drilling of micro holes in stainless steel and nickel-based superalloy by pulsed Nd:YAG laser radiation
, presented at the 5th International Symposium on Laser Precision Microfabrication LPM
, Nara, Japan2.
J.
Willach
, J.
Michel
, A.
Horn
, W.
Schulz
, E.W.
Kreutz
, R.
Poprawe
(2004
) Approximate Model for Trepanning with Microsecond Nd:YAG Laser Radiation, Presented at the 7th International Conference on Laser Ablation COLA
, Hersonissos, Crete, Greece, to be published in Appl. Phys. A
3.
W.
Schulz
, U.
Eppelt
, H.
Heesen
, V.
Kostrykin
, J.
Michel
, M.
Niessen
(2003
) Identification of Dimension in Phase Space for Cutting, Proc. Sec. Int. WLT-Conf.
Lasers in Manufacturing
, Munich, Germany
, 321
–355
4.
W.
Schulz
, V.
Kostrykin
, H.
Zefferer
, D.
Petring
, R.
Poprawe
(1997
) A Free Boundary Problem Related to Laser Beam Fusion Cutting: ODE Approximation
, Int. J. Heat and Mass Transfer
, 40
12, 2913
–2938
5.
J.
Willach
, Phd thesis
, RWTH Aachen, in preparation
This content is only available via PDF.
© 2004 Laser Institute of America.
2004
Laser Institute of America
You do not currently have access to this content.