In the fiber laser cutting of steel with nitrogen assist gas, the effect of positional relationship between the centers of a nozzle and a laser beam on the cutting quality was investigated by laser cutting experiments and computational fluid dynamics analysis of the assist gas flow. The laser cutting experiment of 3.2 mm cold rolled steel was carried out by a 3 kW fiber laser. The spot diameter of the laser beam and the inner diameter of the nozzle were 140 μm and 2.0 mm, respectively. In laser cutting, by shifting the center of the laser beam toward the cutting direction inside the nozzle, the dross height becomes large. In the nozzle shifting setup, the cooling effect becomes high due to a large inflow of assist gas into the kerf, and the reduction of assist gas pressure results in the control of the cooling effect. The formation of appropriate kerf shape by changing the focusing position inside the workpiece leads to an appropriate flow field of assist gas in the kerf. As a result, similar dross height could be obtained by the nozzle shifting setup, compared with that by the coaxial setting of the nozzle and laser beam. The nozzle shifting setup can perform the equivalent dross height to the coaxial setting of the laser beam and nozzle even at lower pressure of the assist gas, and the reduction of assist gas consumption is possible at the same level of dross height in fiber laser cutting of steel.
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February 2021
Research Article|
December 24 2020
Fundamental study on reduction of dross in fiber laser cutting of steel by shifting nozzle axis
Atsushi Yagi;
Atsushi Yagi
1
Graduate School of Natural Science and Technology, Okayama University
, 3-1-1 Tsushimanaka, Kita-ku, Okayama 700-8530, Japan
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Seigo Kadonaga;
Seigo Kadonaga
1
Graduate School of Natural Science and Technology, Okayama University
, 3-1-1 Tsushimanaka, Kita-ku, Okayama 700-8530, Japan
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Yasuhiro Okamoto;
Yasuhiro Okamoto
1
Graduate School of Natural Science and Technology, Okayama University
, 3-1-1 Tsushimanaka, Kita-ku, Okayama 700-8530, Japan
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Hiroaki Ishiguro;
Hiroaki Ishiguro
2
AMADA CO., LTD.
, 200 Ishida, Isehara, Kanagawa 259-1196, Japan
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Ryohei Ito;
Ryohei Ito
2
AMADA CO., LTD.
, 200 Ishida, Isehara, Kanagawa 259-1196, Japan
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Akihiko Sugiyama;
Akihiko Sugiyama
2
AMADA CO., LTD.
, 200 Ishida, Isehara, Kanagawa 259-1196, Japan
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Hiroshi Okawa;
Hiroshi Okawa
2
AMADA CO., LTD.
, 200 Ishida, Isehara, Kanagawa 259-1196, Japan
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Rio Fujita;
Rio Fujita
2
AMADA CO., LTD.
, 200 Ishida, Isehara, Kanagawa 259-1196, Japan
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Akira Okada
Akira Okada
1
Graduate School of Natural Science and Technology, Okayama University
, 3-1-1 Tsushimanaka, Kita-ku, Okayama 700-8530, Japan
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Note: Paper published as part of the special topic on Proceedings of the International Congress of Applications of Lasers & Electro-Optics 2020.
J. Laser Appl. 33, 012022 (2021)
Article history
Received:
November 30 2020
Accepted:
November 30 2020
Citation
Atsushi Yagi, Seigo Kadonaga, Yasuhiro Okamoto, Hiroaki Ishiguro, Ryohei Ito, Akihiko Sugiyama, Hiroshi Okawa, Rio Fujita, Akira Okada; Fundamental study on reduction of dross in fiber laser cutting of steel by shifting nozzle axis. J. Laser Appl. 1 February 2021; 33 (1): 012022. https://doi.org/10.2351/7.0000300
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