METHOD AND DEVICE FOR EVALUATING CUTTING PERFORMANCE OF LASER BEAM MACHINING NOZZLE, AND LASER BEAM CUTTING MACHINE HAVING DEVICE FOR EVALUATING CUTTING PERFORMANCE OF LASER BEAM MACHINING NOZZLE

摘要

PPROBLEM TO BE SOLVED: To provide a method and a device for evaluating the cutting performance of a laser beam machining nozzle capable of quantitatively determining the cutting performance of individual laser beam machining nozzles before performing the laser beam cutting, and a laser beam cutting machine having the device for evaluating the cutting performance of the laser beam machining nozzle. PSOLUTION: In the method and the device for evaluating the cutting performance of the laser beam machining nozzle, an impact pressure measuring instrument 21 has an assist gas inlet 23 having the diameter substantially equal to the width of a cut groove capable of allowing assist gas to be jetted from a laser beam machining nozzle 11 to flow therein, and the impact pressure of the assist gas corresponding to the change in the nozzle space is measured while changing the nozzle space as the distance between the assist gas inlet and the nozzle continuously or step by step. It is determined whether or not the laser beam machining nozzle has the impact pressure equal to or more than the permissible cutting impact pressure. PCOPYRIGHT: (C)2009,JPO&INPIT