| 摘要 |
PURPOSE:To improve and stabilize laser beam cutting quality by mixing different kind of gas in O gas and changing the rate of O purity according to a cutting shape of a material to be cut to perform laser beam cutting thereon. CONSTITUTION:A gas bomb 9 of N gas, etc., of the different kind is connected to an assisting gas supplying device 8 of a laser beam machine 3 together with an O gas bomb 7. The assisting gas having a large quantity of N gas mixed in the O gas is supplied to a fine cutting 11 part and a sharp edge 10 part of the material 5 to be cut by the gas supplying device 8 and laser beam cutting is performed. By this method, since the O purity is adjusted low at the parts with the complicated cutting shapes, the oxidation reaction is suppressed. Accordingly, melting-down due to thermal saturation at the fine cutting parts 10 and 11 is reduced and the cutting quality is improved and stabilized. |
