| 摘要 |
PURPOSE:To facilitate the drilling of a boron material without reducing the mechanical strength of the boron material, by irradiating the laser beam to the area to be drilled after reducing the thickness of that area by the sandblast, etc. CONSTITUTION:A hollow area 7 is formed with a <=15mum thickness to a boron pipe 1 with use of the abrasive powder 6 jetted out of a sandblast nozzle 5, etc. Then a laser beam 8 condensed by a lens 13 is irradiated to the areas undone by the sandblast to ensure the drilling with high precision. In such way, the drilling work can be facilitated without reducing the mechanical strength of the boron material, and at the same time the oxidation due to the increase of temperature can be avoided. |
