METHOD FOR WORKING ROCK USING LASER AND DEVICE THEREFOR

Title:

METHOD FOR WORKING ROCK USING LASER AND DEVICE THEREFOR

Document Type and Number:

WIPO Patent Application WO/2011/077559

Kind Code:

A1

Abstract:

Provided is a process for working rock by a laser, which is capable of achieving remarkably high working efficiency, a reduction in working time, and a reduction in working energy. By applying a laser (13) having a wavelength of 1.2 μm or more and a high capability of being absorbed in liquid to the surface of rock (11) immersed in liquid (10) through the liquid (10) with the liquid (10) placed on the way to the surface of the rock (11) and generating induced bubbles in the liquid (10), dross generated in a keyhole (21) of an application portion of the laser (13) is scattered. By continuously moving the laser application position along the application surface, controlling the application condition and the movement speed of the laser (13) on the basis of information from a worked portion of the rock so that a laser non-application portion (22) is cleaved and destroyed by thermal stress, and moving the laser (13) as shown by the arrow (14), a large-diameter hole such as shown by a peripheral edge (23) and a bottom portion (24) is efficiently formed.

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Inventors:

KOBAYASHI TOSHIO (JP)
OKATSU KOMEI (JP)
NAKAMURA MASAHIRO (JP)

Application Number:

PCT/JP2009/071637

Publication Date:

June 30, 2011

Filing Date:

December 25, 2009

Export Citation:

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Assignee:

JAPAN DRILLING CO LTD (JP)
JAPAN OIL GAS & METALS JOGMEC (JP)
KOBAYASHI TOSHIO (JP)
OKATSU KOMEI (JP)
NAKAMURA MASAHIRO (JP)

International Classes:

B23K26/14; B23K26/00; B23K26/38; B28D1/00

Foreign References:

JPS63174795A	1988-07-19
JP2008114257A	2008-05-22
JP2004526577A	2004-09-02

Attorney, Agent or Firm:

KOSUGI, Yoshio et al. (JP)
Yoshio Kosugi (JP)

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