| 摘要 |
With the board G having being shaped beforehand, it is pierced using a battery of tools such as drills 7 mounted on a plate 6, the displacements of which with respect to the board are controlled by a program ensuring a first sequence of displacements in order to pierce holes with a pitch which is a sub-multiple of the distance separating two consecutive tools and, after an elementary zone has been pierced, a second displacement sequence of a pitch which is a multiple of the distance separating two tools. …<??>The invention permits, in particular, perforation piercing for sound-insulation structural boards which can be used, in particular, in aeronautics. …<IMAGE>… |
