SHIELDING GAS SUPPLY DEVICE FOR LASER PROCESSING MACHINE, AND LASER PROCESSING MACHINE

摘要

The problem addressed by the invention is to eject a shielding gas efficiently onto a workpiece when performing laser processing using a laser processing machine. The means for overcoming the problem comprises a ring-shaped portion (8) disposed in a position surrounding a laser beam (L) which is radiated from a laser processing machine (1) onto a workpiece (M), and a supply pipe (7) which supplies the shielding gas to the ring-shaped portion (8). The ring-shaped portion (8) has, in the circumferential direction of said ring-shaped portion (8), a travel path (15) for the shielding gas supplied from the supply pipe (7). The travel path (15) is disposed in multiple levels relative to the workpiece (M) and is provided, in an inner circumferential part (11) of the ring-shaped portion (8), with holes (12) which eject the shielding gas in such a way as to form a flow which swirls in said circumferential direction.