APPARATUS FOR MAKING HOLLOW ARTICLES Russian patent published in 2000 - IPC

FIELD: plastic metal working, namely, drawing of sheet blanks with use of elastic punch. SUBSTANCE: apparatus includes die for placing sheet blank, inner and outer holders arranged concentrically one relative to another in such a way that their ends form gap relative to sheet blank. Elastic inner and outer punches separated by partition are arranged in annular cavities between holders. Pressure punches are placed from upwards onto elastic punches. In inner cavity of die there is elastic rest. Elastic punches are made of pellets whose value corresponds to gap between blank and ends of holders. Pellets are mixed with lubricating powder. EFFECT: enhanced wear resistance of elastic punches, improved stability of process at operation of apparatus. 1 dwg