FIELD: plastic working of metals, possibly manufacture of hollow parts such as sleeve type parts with central protrusion on inner surface of bottom, namely artillery shell cases.
SUBSTANCE: method comprises steps of backward pressing out of initial blank and shaping bottom portion having protrusion on inner surface during several transitions. After backward pressing out transition, blank is drawn at several transitions. Bottom portion with central protrusion is formed during two transitions, namely: at transition for preliminarily shaping central protrusion and at transition for finally forming bottom portion. Preliminary forming is realized during transition of backward pressing out of initial blank by means of inner punch with recess. Final forming is realized by means of inner punch with recess and outer punch with protrusion.
EFFECT: improved quality of articles.
5 dwg
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