| 摘要 |
PURPOSE:To settle such problems that dross adheres to the reverse side of an object to be worked since a molten metal does not flow smoothly in the vicinity of a working start point in the case of laser beam machining of the object to be worked of a thick plate, and a working failure is generated due to a fact that this dross raises a temperature of the object to be worked, by the laser beam machining method of this invention. CONSTITUTION:A laser beam is subjected to reciprocating scanning in a section on a working path after working is started, the laser beam is returned to the working start point again, and thereafter, regular working is executed. Since the laser beam is subjected to reciprocating scanning in a section on the working path after working is started, width of a cut groove in the vicinity of the working start point in which the generation frequency of a working failure is high is widened, and since a molten object melted by the laser beam can be eliminated smoothly, it can be prevented that dross adheres to the reverse side of an object to be worked and stable working can be executed. |
