Sumitomo Electric Industries, Limited

Okayama University

Nagata Seiki Kabushiki Kaisha

Yoshiyuki Uno

Motoki Kakui

Shinobu Tamaoki

Hiroshi Kohda

Yasuomi Kaneuchi

Shigehiro Nagano

Akira Okada

Yasuhiro Okamoto

Kenta Takahashi

Kensuke Uemura

Raharjo Purwadi

There is obtained a laser processing method by which an excellent shape of a cut surface can be achieved and an increase in cost can be suppressed. A laser processing method includes the steps of: preparing a material to be processed; and forming a modified area in the material to be processed, by irradiating the material to be processed with laser beam. In the aforementioned step, pulsed laser beam having a continuous spectrum is focused with a lens, thereby forming a focusing line constituted by a plurality of focuses that are obtained by predetermined bands forming the continuous spectrum of the laser beam, and the material to be processed is irradiated with the laser beam such that at least a part of the focusing line is located on a surface of the material to be processed, thereby forming the modified area on an axis of the focusing line.

Laser processing method

Method for surface treating a die made of metal in which a low energy, pulsed electron beam, which does not scatter, performs a treatment over a wide area due to presence of anode plasma in a chamber in which the electron beam is formed to smooth and gloss a surface of the die and increase a surface hardness and corrosion resistance of the die. The irradiation may be performed with an energy density not less than 1 J/cmper pulse, at least 5 pulse irradiations and a pulse duration of at least 1 &#x3bc;s. A die subjected to the surface treatment method exhibits improved surface smoothness and glossiness, as well as high corrosion resistance.

Method for surface treating a die by electron beam irradiation and a die treated thereby

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Okayama, Japan

Yoshiyuki Uno