| 摘要 |
<p>A laser microdrilling method uses a power laser beam (3) the action of which causes solid workpiece metal (1) to be transformed into both liquid and vapour phases. In order to improve the surface finish and dimensional accuracy of a hole (4) formed, the workpiece (1) is heated to a temperature sufficient to cause both the liquid phase formed directly by the action of the laser beam (3) and the liquid phase caused by the condensation of the vapour phase on the wall of the hole being formed (4), to be maintained in the liquid state for a period of time long enough to permit the uniform spreading of these liquid phases over the wall of the hole (4). For a plate workpiece, the ends are clamped to conductors from a high frequency source (9). For a fuel injector, the tip is covered by a bell connected to the electrical source. A plasma torch may be used during and after laser drilling to improve the bore quality. <IMAGE></p> |
