| 摘要 |
PURPOSE:To perform the laser cutting for obtaining a pretty cut face having no adhesion of a dross by injecting a high pressure air toward the cutting of a work in the state of setting the focal point of the laser beam projecting toward the work on the backface of the work or its vicinity. CONSTITUTION:In the case of cutting a work 7, a high pressure air is fed to a gas pressure switching device 21 via a solenoid valve 21 and converted into the low pressure of 0.5-1.5kg/cm<2>. The piercing of the work 7 by the laser beam 6 is completed by setting the focal point of the beam 6 at the work surface side. Then, the high pressure air of 8-15kg/cm<2> is fed to the assist gas feeding port 1a of the nozzle main body 1 directly from an air source by opening a solenoid valve 17 simultaneously with changing the feeding speed of the nozzle main body 1 as shown in a figure. The work 7 is cut by setting the focal point of the beam 6 at the back face of the work 7 at the same time. The work 7 is thus cut with good efficiency, the dross generated at the cutting time is blown off by the high pressure air and a pretty cut face can be obtd. |
