| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a laser cutting machining method and a laser machining device suppressing generation of a recessed part liable to be formed in an inner peripheral surface of an annular hole in a cutting end region when annularly laser-cutting machining a plank. <P>SOLUTION: When oxygen is used as an assist gas, a position reaching an annular path to be annularly cut from a piercing machining position is defined as a position A, a position at a predetermined distance from the position A in the direction of process of cutting machining is defined as a position B, a position at a predetermined distance from the position A in a direction opposite to the direction of process of laser-cutting machining is defined as a position C, in the case that laser-cutting machining is performed from the position A to the position C via the position B, and then laser-cutting machining is performed from the position C to the position B via the position A, laser-cutting machining from the position C to the position B is performed by making laser output small and reducing the cutting speed relative to laser output from the position A to the position C and its cutting speed and laser output is reduced to zero at the position B. <P>COPYRIGHT: (C)2012,JPO&INPIT |
