FIELD: plastic working of metals, possibly manufacture of articles having cavity restricted by surfaces determined with use of second-order curves, for example outlet electrode (anode) of plasmotron.
SUBSTANCE: method comprises steps of calibrating initial blank and marking out opening; upsetting blank for forming disc; deforming semi-finished product by extruding cavity in die during two stages; at first stage drawing metal into gap between die and punch and forming lower portion of article by forward extrusion process; at second stage calibrating cavity with use of counter-pressure and forming upper portion of article.
EFFECT: enhanced accuracy of articles.
4 cl, 5 dwg, 1 ex
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