METHOD OF DRAWING COMPLEX LARGE-SIZE HALF-STOCK FROM BLANK AT PRESS (VERSIONS) Russian patent published in 2013 - IPC B21D22/20 

FIELD: process engineering.

SUBSTANCE: invention relates to metal forming and may be used for drawing half-stock from blanks. One version of die is intended for use at dual- or triple-action press. Note here that female die has openings at pressure surface and control valves with pipes to feed compressed air to said openings. Note here that said valves can force compressed air via pressure female die openings to drawn half-stock edges after termination of half-stock drawing at the moment of extractor upward motion start to extract said half-stock from female die. In compliance with another version, said mould can be used at simple- or multi-position automatic moulding machine. Here, female die features similar design while control valves feed compressed air via openings at female die pressure surface to drawn half-stock edges at the moment of female die detachment from pressure plate.

EFFECT: higher accuracy and quality.

2 cl, 2 dwg