| 摘要 |
<p>A laser machining method which can cut a mild steel sheet, etc., at a higher speed. A condenser lens (10a) is disposed inside a working head (10). Laser beams (11) are condensed by this condenser lens (10a) and are irradiated to a work. An assist gas inlet (10b) is disposed on the side surface of the working head (10), and an oxygen gas bomb (90) and an inert gas bomb (91) are connected to the assist gas inlet (10b). The gas supplied to the assist gas inlet (10b) is jetted to the work from a nozzle at the distal end of the working head (10). Solenoid valves (90a, 91a) are provided to the oxygen gas bomb (90) and to the inert gas bomb (91), respectively, and their opening/closing operations can be electrically controlled. When the work is to be cut, a saturation cutting speed is in advance determined. When a cutting speed is less than this saturation cutting speed, the oxygen gas is supplied to the assist gas inlet (10b). When a cutting speed is higher than the saturation cutting speed, the inert gas is supplied to the assist gas inlet (10b).</p> |
