DIE FOR OPEN-TYPE BULK FORGING Russian patent published in 2014 - IPC B21J13/02 

FIELD: metallurgy.

SUBSTANCE: die includes upper and lower halves with prints forming a stream, a box and a flash bridge. The bridge is made by connection of a horizontal section to a section formed by a projection on one half of the die by a bore on the other half of the die. The projection is restricted by some part of a circle with radius R1, and the bore is made with radius R2. Centre of bore radius R2 is offset relative to the centre of projection radius R1 to the zone of the stream with larger surface areas of cross sections along the perimeter of the flash bridge and to the side from the zone of the stream with smaller surface areas of cross sections. With that, offset is performed by a value that is variable along the perimeter of the flash bridge and does not exceed 0.8h, where h - design height of the flash on the flash bridge.

EFFECT: reduction of forging force and decrease of distortion of forged pieces, forging inclinations and thickness of the flash.

2 dwg