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

FIELD: metallurgy.

SUBSTANCE: round blank is swaged by two mutually perpendicular die pairs. One die pair has smooth work surface, the other die pair features carved grooves on the work surface. Side surfaces of carved grooves are oriented at 120° angle to each other. Work surfaces of dies are shifted against each other along forging axis. First, round blank is swaged by the die pair with smooth work surface in several deformation cycles. Each cycle includes several runs. Thus, octagonal profile is obtained. Ratio of inscribed circle diameter of this profile to side surface length of carved groove in a die does not exceed 1.93. In each deformation cycle, the blank is turned around its axis before each run in sequence at π/2, π/4 and π/2 angles. Before each deformation cycle, gap between work surfaces of dies with smooth surface is reduced. Finally, swaging is performed with two die pairs at the same time to obtain hexagonal profile.

EFFECT: extended processing capabilities of radial forging to obtain high-quality hexagonal profiles.

20 dwg