| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a laser machining nozzle and a laser machining apparatus which are capable of discharging and blowing a molten metal from the inside of a cutting groove in an oxygen-free cutting operation using the laser beam, thereby preventing the deposition of dross on a back side of a workpiece. <P>SOLUTION: A double nozzle comprises a main assist gas injection port for injecting laser beam and main assist gas, and an auxiliary assist gas injection port disposed concentrically and annularly around the main assist gas injection port for injecting auxiliary assist gas. The auxiliary assist gas injection port has its face formed downstream of the main assist gas injection port face in the assist gas flow, and the injection angle of the auxiliary assist gas at the position of intersection between a gas flow axis of the main assist gas and a gas flow axis of the auxiliary assist gas is set within a range of 0 to 80°with respect to the injection axis of the main assist gas. <P>COPYRIGHT: (C)2011,JPO&INPIT</p> |
