METHOD FOR RADIAL FORGING OF SHORT-LENGTH BLANKS Russian patent published in 2018 - IPC B21J1/04 B21J13/08 

FIELD: metallurgy.

SUBSTANCE: blank with its one end made with female conical surface is connected to one end of extension tool having a male conical surface. The blank is fed to strikers by the extension tool and its deformation is carried out till ready profile is produced by strikers during their reciprocation motion. In this case, before joining the drill collar with the blank, the latter is heated. After joining, the blank with extension is held for heat transfer from the blank to extension toll with provision of interference between their conical surfaces.

EFFECT: provided reliable connection of the short-length blank with extension which ensures stability of radial forging.

4 dwg, 1 ex