| 摘要 |
<p>PROBLEM TO BE SOLVED: To restrain thermal deformation of a material to be cut at the time of laser cutting. SOLUTION: When a laser light 3 is radiated on a surface A of a steel plate 2 for laser cutting the steel plate 2, water 11 for cooling is sprayed in a mist condition around the laser light radiation part of the surface A of the steel plate 2. Thereby, since the periphery of the laser light radiation part of the surface A of the steel plate 2 is cooled by the water 11 sprayed like a mist, temperature distribution of the surface A and an underside B around the laser light radiation part becomes approximately even. Also, the difference between the thermal expansion volume on the surface A side and that of the underside B side of the steel plate 2 is almost eliminated, so that thermal deformation in the plate thickness direction can be restrained.</p> |
