| 摘要 |
PURPOSE: To obtain a machining head of a laser machining apparatus which can cut off in an arbitrary direction. CONSTITUTION: In the apparatus for cutting off a metallic material by preheating the surface of metallic material to a firing temp. below the melting temp. and jetting gaseous oxygen jet onto the preheated range 37, a conical- shaped reflecting mirror 9 for reflecting a laser beam 7 introduced into the inner part of a housing 3 in the machining head 1 at the beam axis of the laser beam. An annular-shaped concave mirror 15 which can converge the reflected beam from this reflecting mirror 9 onto the upper position of the surface of metallic material is arranged so as to face to the reflecting mirror 9. Then, plural laser beam throughholes 17, in which the laser beam 7' from this concave mirror 15 can pass through, are arranged at the bottom part 5 of the housing. A gas jetting nozzle 21 which can jet the gaseous oxygen in the same axis as the laser beam axis, is arranged at the bottom part 5 of the housing. |
