PUNCH FOR EQUAL CHANNEL ANGULAR PRESSING (VERSIONS) Russian patent published in 2008 - IPC B21C25/00 

FIELD: technological processes.

SUBSTANCE: punch includes bandage with insert consisting of several segment parts with their crossing planes conjugated to form inlet channel, bottom support, outlet channel, and extrusion ram. Each segment part of bandage insert features guiding lines forming kinematical forward couples with conjugated segment parts of insert. In the first version, each segment part of insert is made in the form of incomplete cylinder segment limited by two cross-planes. In the second version, insert is made in the form of truncated pyramid with quadrangle base and blunted side facets. Insert segment part form is limited by two planes perpendicular to each other and a tilted plane part limited by the planes and tilted against symmetry axis of inlet channel. In the third version, each segment part of insert is made in the form, limited by radial surface, two crossing planes and cylindrical surface part limited by the planes. In the fourth version, insert is made in the form of truncated pyramid with quadrangle base and blunted side facets. In the fifth version, insert is made in the form of truncated pyramid with hexagon base, insert segment part form limited by radial surface, two planes crossed at 120° and a tilted plane part limited by the planes and tilted against symmetry axis of inlet channel.

EFFECT: possible repair of separate punch parts.

18 cl, 22 dwg