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International Heat Transfer Conference 13

ISSN: 2377-424X (online)
ISSN: 2377-4371 (flashdrive)

MICRODRILLING OF METALS WITH A NANO-SECOND PULSED BESSEL LASER BEAM

Masamichi Kohno
Department of Mechanical Engineering, Thermofluid Physics Laboratory, Kyushu University, 744 Motooka, Nishi-ku, Fukuoka, 819-0395, Japan; International Institute for Carbon-Neutral Energy Research (WPI - I2CNER), Kyushu University, 744 Motooka, Nishi-ku, Fukuoka 819-0395, Japan

S. Kawauchi
Department of Mechanical Engineering Science, Kyushu University, 6-10-1 Hakozaki, Higashi-ku, Fukuoka 812-8581, Japan

Yasuyuki Takata
Department of Mechanical Engineering, Thermofluid Physics Laboratory, Kyushu University, 744 Motooka, Nishi-ku, Fukuoka, 819-0395, Japan; International Institute for Carbon-Neutral Energy Research (WPI-I2CNER), 744 Motooka, Nishi-ku, Fukuoka 819-0395, Japan

Y. Matsuoka
Advanced Manufacturing Research Institute, National Institute of Advanced Industrial Science and Technology (AIST), 1-2-1 Namiki, Tsukuba, Ibaraki 305-8564, Japan

DOI: 10.1615/IHTC13.p13.50
6 pages

Abstract

Laser microdrilling in a metal foil with a thickness of 20 μm (stainless steel, copper) or 18 μM (aluminum) with a pulsed nano-second Bessel laser beam (wavelength: 532 nm) was carried out. Microdrilling without precise control of the work distance was shown to be possible since a Bessel beam has a deep focal depth. The diameter of a through hole thus formed was maintained at several μm when the work distance was changed within a range of several mm. Regardless of the type of metal used, a fine through-hole with a diameter of several μm was produced in a foil. However, the morphology of the processed surface was significantly different depending on the metal used. A through-hole in a stainless steel plate with a thickness of 100 μm was also produced and the shape of the hole was evaluated by observing a sectioned sample.

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Measurement of fluid temperature with an arrangement of three thermocouples