FIELD: machine building.
SUBSTANCE: blank is fixed at spark-erosion machine powder electrode is brought thereto to overlap blank bore by said electrode. Voltage is fed to between electrode and blank to generate reiterating electric discharge to make stopping coat grow from bore edges. Note here that prior to voltage application bore edges are machined to make them skewed, or coat is skewed along bore edges in voltage application. Here, electrode may be used that has a ledge of sizes which allow its fitting so close to said blank that said ledge is located opposite bore inner side.
EFFECT: higher efficiency and reliability, possibility make bores immediately before coat application.
6 cl, 17 dwg
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