| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a method and a device for laser beam machining by which the generation of a crack at a part being machined is prevented and the working time of the laser beam machining is shortened. SOLUTION: A work W is irradiated with a laser beam L with a YAG laser device 1 after the work W is preheated with an electric heater 21. By irradiating the face to be irradiated of the work W with laser beam after the work W is preheated, the difference in the temperatures before and after the irradiation of the laser beam L becomes smaller than that in the case where the work W is irradiated with the laser beam L when the temperature of the work is nearly equal to the room temperature. Thus, a thermal stress given to the machining zone of the work W is decreased and the generation of a crack is decreased. Further, by irradiating the work W with laser beam L after the work W is preheated, a heat input process is eliminated or the time required for the heat input process is shortened, and the working time of the laser beam machining is shortened.</p> |
