METHOD FOR PRODUCING A BARREL Russian patent published in 2018 - IPC B21K21/06 B21J13/08 

FIELD: technological processes.

SUBSTANCE: invention relates to the treatment of metals by pressure and can be used in the manufacture of a barrel with a threaded or smooth guide part. From the initial blank, a workpiece-pipe is obtained by the pre-machining process, that has at the ends a feed and a leading part. Workpiece-pipe is subjected to a radial reduction on the radial-crimping machine with fastening of its feed and the leading parts, respectively, in the retaining and hollow driving centers of the machine. Hollow driving center has a small cylinder with teeth at the end in the front, a large cylinder in the middle part, with grooves without back walls, and a shank in the rear. End of the small cylinder is tilted toward the big cylinder. Preliminary machine work is carried out to obtain at the end face of the cylinder a leading part of the preform-liner pipe separating the annular cavities from the axial hole of the preform-pipe. When fastening the leading part of the workpiece-pipe in the hollow lead center, the shank without a gap is placed in the cavity, which is performed on the end face of the small cylinder of the hollow driving center.

EFFECT: reduction of transverse vibrations of the leading part of the workpiece-pipe during radial reduction is provided.

3 cl, 2 dwg