| 摘要 |
To produce micro-bores in the mu m-range, first of all a blind hole is eroded in the workpiece in a known manner by electrical discharge machining. At the same time, unlike the previously known methods, pressure is applied to the underside of the workpiece. The actual break-through of the hole is reached when an individual spark partially melts through the remaining wall at one point at the bottom of the blind hole. Consequently, the molten metal is thrown out at this point through the already eroded part of the hole as a result of the high pressure on the underside of the workpiece, which results in the actual break-through of the hole. In order to prevent the following spark from enlarging the hole, the electrical discharge machining must be switched off directly after the hole develops. Nozzles used for the most varied purposes and which are required, for example, to produce minimum throughputs or a thin jet at high pressures are suitable as a field of application for micro-bores of this type.
|
