METHOD OF FABRICATION OF ITEMS OF "CARTRIDGE" TYPE Russian patent published in 2010 - IPC B21K21/00 B21J5/06 

FIELD: metallurgy.

SUBSTANCE: method of fabrication of items of "cartridge" type out of aluminium alloys consists in thermal treatment of primary blank and in its successive extrusion in punch. The punch consists of a puncheon and a matrix. There is used the puncheon with locking and calibrating parts; also the puncheon has grooves on surface along generating line for connecting the cavity of the blank with atmosphere. Length of the calibrating line is equal to depth of a cartridge. Extrusion is performed up to intermediate metal locking in the punch with a process support. The support is installed between surfaces of the puncheon and matrix; the support is designed to travel along the calibrating part of the puncheon till rest against the locking part under influence of metal. At rest of the support into the locking part of the puncheon height of the support facilitates locking metal in the punch for its re-distribution along perimetre of the matrix. Further the support is extracted from the punch. The blank is deformed and finish forming of side walls and bottom part of the blank is performed.

EFFECT: facilitating fabrication of part with parallel along generating line internal and external surfaces with different thickness of walls around perimetre and with bottom of complicated relief per one punching run.

3 dwg, 1 ex