| 摘要 |
The invention is related to the field of pulsed electrochemical machining of steels and alloys and can be used for performing various precision copying and piercing operations for manufacturing intricate profile surfaces of machine and tool workpieces made of hard-to-machine materials. The method comprises the steps of applying microsecond current pulse packages synchronized with an instant when the machining electrode and a workpiece are moved to a minimum distance towards each other, measuring at least one concordant voltage and current value in each pulse, calculating corresponding values of an interelectrode gap resistance, and adjusting the machining process in accordance with the changes of the interelectrode gap resistance. During the machining process, amplitude-time pulse parameters are adjusted in accordance with the changes of the shape of an interelectrode gap resistance curve during a pulse supply, said curve shape being considered as an accuracy criterion for copying the shape of the machining electrode. Amplitude-time pulse parameters can be adjusted by increasing a current pulse amplitude and controlling a ratio of a duration of a voltage rise to a duration of a steady-state process, or by increasing a voltage pulse duration and controlling a ratio of a duration of a current decrease to a duration of a steady-state process. In addition, an amplitude or duration of a pulse of an opposite polarity can be adjusted. The invention allows improving the copying accuracy and increasing the machining performance when the copying accuracy is predetermined.
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