RADIAL FORGING OF HEXAGONAL SECTIONS Russian patent published in 2015 - IPC B21J5/12 

FIELD: process engineering.

SUBSTANCE: invention relates to metal forming and may in production of hexagonal sections by radial forging. Blank is squeezed by two mutually perpendicular airs of flat dies. Working surfaces of flat dies of one pair are shifted along hammering axis relative to those of another pair. Magnitude of said shift is larger than the length of flat die working surface. Flat dies of one pair have smooth working surface. Flat dies of another pier feature working surface composed of cut passes with surfaces arranged at 120 degrees. Said cut passes are shifted relative to each other to get hexagonal section at next to last forging pass in said cut passes with different spacing there between. Spacing between working surfaces of flat dies with smooth working surface is set smaller then the least distance between hexagon faces made at next the last pass. Blank before final pass is turned over through 60 degrees to set said faces at larger spacing there between from the side of flat dies with smooth working surface.

EFFECT: higher quality of sections.

4 dwg, 1 ex