FIELD: plastic working of metals, namely forming portion of lowered diameter in open end of container.
SUBSTANCE: apparatus includes housing, lower die and radially unclamped guiding organ in the form of shaping members being outer and inner shaping segments. When guiding organ is in clamped state its inner segments are arranged inside outer ones. In second variant of invention each shaping segment has carrying surface for container; said carrying surface has upper cylindrical portion and inlet annular portion. In order to reduce diameter of open end of container, guiding organ is unclamped, open part of container is inserted to lower die, then guiding organ is clamped and container is removed out of lower die. Invention provides possibility for decreasing metal thickness of open end of container and also diameter of said portion.
EFFECT: enhanced efficiency of method, improved design of apparatus.
34 cl, 22 dwg, 1 tbl
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