| 摘要 |
<p>Electron discharge machining method and device whereby a work piece (2) is machined using a tool (1) along a machining front which retreats ahead of the tool under the effect of spark erosion. The work piece and the tool are separated from one another by a machining gap. A cyclic sequence of voltage pulses (Uign) is applied between the tool and the work piece in order to generate the sparks used for erosion. The tool is moved along a number of axes (3, 4, 15) relative to the work piece. The sparks used for erosion are separated from one another by pauses (TS). A parameter (TDmoy) representative of the width of the machining gap is measured (7, 10, 11 ) in real time. The method and the device are characterized in that the variations in the width of the machining gap are countered by means of a permanent control loop (5, 7, 10, 11, 16, 20, 9, 6, 5) which governs the mean machining power (Pmoy) in accordance with a continuous law which makes the pause (TS) dependent on the parameter that represents the width of the machining gap (TDmoy). Said internal loop does not cause any change in axis. By virtue of these features, an electron discharge machining method and device are obtained that have very rapid, almost instant, control, thus eliminating the defects caused by mechanical inertia.</p> |
